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From: Noah Fleiszig <noah.fleiszig@kds.vic.edu.au>
Newsgroups: comp.lang.python
Subject: Re: Python-list Digest, Vol 152, Issue 40
Date: Thu, 26 May 2016 15:06:36 +1000
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Xref: csiph.com comp.lang.python:109151

thank you

On Thu, May 26, 2016 at 2:00 AM, <python-list-request@python.org> wrote:

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>
> Today's Topics:
>
>    1. html & python connection problem with hyperlinks
>       (litssa2005@gmail.com)
>    2. Re: Exended ASCII and code pages [was Re: for / while else
>       doesn't make sense] (Chris Angelico)
>    3. Re: for / while else doesn't make sense (Marko Rauhamaa)
>    4. Re: Spurious issue in CPython 2.7.5 (thomas povtal.org)
>    5. Re: Spurious issue in CPython 2.7.5 (Tim Golden)
>    6. Re: for / while else doesn't make sense (Christopher Reimer)
>    7. Re: Spurious issue in CPython 2.7.5 (thomas povtal.org)
>    8. ValueError: I/O operation on closed file (San)
>    9. Re: ValueError: I/O operation on closed file (Joel Goldstick)
>   10. Find the max number of elements in lists as value in a
>       dictionary (Daiyue Weng)
>   11. Re: ValueError: I/O operation on closed file (alister)
>   12. IndexError for using pandas dataframe values (Daiyue Weng)
>   13. Re: Find the max number of elements in lists as value in a
>       dictionary (Jussi Piitulainen)
>   14. Re: Find the max number of elements in lists as value in a
>       dictionary (Jon Ribbens)
>   15. Re: html & python connection problem with hyperlinks
>       (justin walters)
>
>
> ---------- Forwarded message ----------
> From: litssa2005@gmail.com
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 03:24:30 -0700 (PDT)
> Subject: html & python connection problem with hyperlinks
> Why not created the field title, that located on the template
> BusinessList.html as a link to go to Business_Detail.html..? please check
>
> Code:
>
> models. py:
>
> from django.db import models
>
>
> REGIONS =3D (
> ('=CE=98=CE=95=CE=A3', '=CE=98=CE=95=CE=A3=CE=A3=CE=91=CE=9B=CE=9F=CE=9D=
=CE=99=CE=9A=CE=97'),
> ('=CE=A3=CE=95=CE=A1', '=CE=A3=CE=95=CE=A1=CE=A1=CE=95=CE=A3'),
> ( '=CE=91=CE=98=CE=97', '=CE=91=CE=98=CE=97=CE=9D=CE=91'),
>
>
>
> TYPEOFBUSINESS =3D (
> ('=CE=95=CE=A3=CE=A4', '=CE=95=CE=A3=CE=A4=CE=99=CE=91=CE=A4=CE=9F=CE=A1=
=CE=99=CE=91'),
> ('=CE=A6=CE=91=CE=A1', '=CE=A6=CE=91=CE=A1=CE=9C=CE=91=CE=9A=CE=95=CE=99=
=CE=91'),
> ('=CE=92=CE=99=CE=92', '=CE=92=CE=99=CE=92=CE=9B=CE=99=CE=9F=CE=A0=CE=A9=
=CE=9B=CE=95=CE=99=CE=91'),
> ( '=CE=9A=CE=9F=CE=9C', '=CE=9A=CE=9F=CE=9C=CE=9C=CE=A9=CE=A4=CE=97=CE=A1=
=CE=99=CE=91'),
> ('=CE=A3=CE=99=CE=9D', '=CE=A3=CE=99=CE=9D=CE=95=CE=9C=CE=91')
>
> )
>
> class Business(models.Model):
> created_Date =3D models.DateTimeField(auto_now_add=3DTrue)
> owner =3D models.ForeignKey('auth.User', related_name=3D'snippets', null=
=3DTrue)
> title =3D models.CharField(max_length=3D100, blank=3DTrue, default=3D'')
> Type_of_Business =3D models.CharField(max_length=3D3, choices=3DTYPEOFBUS=
INESS)
> region =3D models.CharField(max_length=3D3, choices=3DREGIONS)
> address =3D models.CharField(max_length=3D100, blank=3DTrue, default=3D''=
)
> phone =3D models.CharField(max_length=3D15, blank=3DTrue, default=3D'')
> image =3D models.ImageField(null=3DTrue)
>
>
> def __str__(self):
> return str(self.title)
>
> views.py
>
> from django.contrib.auth.models import User
> from django.http import HttpResponse
> from django.shortcuts import render, get_object_or_404
> from rest_framework import filters
> from rest_framework import generics
> from rest_framework import permissions
> from snippets.permissions import IsOwnerOrReadOnly
> from snippets.serializers import SnippetSerializer
> from snippets.serializers import UserSerializer
> from .models import Business
>
>
>
> class UserList(generics.ListAPIView):
> queryset =3D User.objects.all()
> serializer_class =3D UserSerializer
>
>
> class UserDetail(generics.RetrieveAPIView):
> queryset =3D User.objects.all()
> serializer_class =3D UserSerializer
>
> class BusinessList(generics.ListCreateAPIView):
>
> permission_classes =3D (permissions.IsAuthenticatedOrReadOnly,)
> queryset =3D Business.objects.all()
> serializer_class =3D SnippetSerializer
> filter_backends =3D (filters.DjangoFilterBackend,filters.SearchFilter,
> filters.OrderingFilter,)
> filter_fields =3D ('Type_of_Business', 'region')
> search_fields =3D ('Type_of_Business', 'region')
> ordering_fields =3D ('Type_of_Business','title', 'region')
>
>
> def BusinessList(request):
> business =3D Business.objects.all();
> return render(request, 'snippets/BusinessList.html' {'business':business}=
)
>
> def perform_create(self, serializer):
> serializer.save(owner=3Dself.request.user)
>
>
>
> class Business_Detail(generics.RetrieveUpdateDestroyAPIView):
> permission_classes =3D (permissions.IsAuthenticatedOrReadOnly,
> IsOwnerOrReadOnly,)
> queryset =3D Business.objects.all()
> serializer_class =3D SnippetSerializer
>
>
> def Business_Detail(request, pk):
> business =3D get_object_or_404(Business, pk=3Dpk)
> return render(request, 'snippets/Business_Detail.html', {'business':
> business})
>
> serializers.py
>
> from rest_framework import serializers
> from snippets.models import Business
> from django.contrib.auth.models import User
>
>
> class SnippetSerializer(serializers.HyperlinkedModelSerializer):
> owner =3D serializers.ReadOnlyField(source=3D'owner.username')
>
> class Meta:
> model =3D Business
> fields =3D ('created_Date', 'owner', 'title','Type_of_Business', 'region'=
,
> 'address', 'phone', 'image')
>
>
> class UserSerializer(serializers.ModelSerializer):
> snippets =3D serializers.PrimaryKeyRelatedField(many=3DTrue,
> queryset=3DBusiness.objects.all())
>
> class Meta:
> model =3D User
> fields =3D ('id', 'username', 'snippets')
>
> BusinessList.html
>
> {% extends 'snippets/base.html' %}
>
> {% block content %}
> {% for business in business%}
> <div class=3D"business">
> <div class=3D"date">
> {{ business.created_Date }} #=CF=84=CF=85=CF=80=CF=89=CF=83=CE=B5 =CE=B7=
=CE=BC=CE=B5=CF=81.=CE=B4=CE=B7=CE=BC=CE=B9=CE=BF=CF=85=CF=81=CE=B3=CE=B9=
=CE=B1=CF=82 =CF=84=CE=BF=CF=85 Business
> </div>
> <h1> <a href=3D'{% url 'Business_Detail' pk=3Dbusiness.pk %}'>{{
> business.title }}</a></h1>
> <p>{{business.Type_of_Business }}</p>
> <h2>{{ business.region }} </h2>
> <h3>{{ business.address }} </h3>
> <h4>{{ business.phone }} </h4>
> {% if business.image %}
> <img src=3D"{{ business.image.url }}"/>
> {% endif %}
> </div>
> {% endfor %}
> {% endblock %}
>
> Business_Detail.html
>
> {% extends 'snippets/base.html' %}' %}
>
> {% block content %}
> <div class=3D"business">
> {% if business.created_Date %} # =CE=B1=CE=BD =CF=85=CF=80=CE=B1=CF=81=CF=
=87=CE=B5=CE=B9 =CE=B7=CE=BC=CE=B5=CF=81=CE=BF=CE=BC=CE=B7=CE=BD=CE=B9=CE=
=B1 =CE=B4=CE=B7=CE=BC=CE=B9=CE=BF=CF=85=CF=81=CE=B3=CE=AF=CE=B1=CF=82
> <div class=3D"date">
> {{ business.created_Date }}
> </div>
> {% endif %}
> <h1>{{ business.title }} </h1>
> <h2>{{ business.region }} </h2>
> <h3>{{ business.Type_of_Business}} </h3>
> <h4>{{ business.phone }} </h4>
> <p>
> {% if business.image %} # =CE=B1=CE=BD =CF=85=CF=80=CE=B1=CF=81=CF=87=CE=
=B5=CE=B9 =CE=B5=CE=B9=CE=BA=CE=BF=CE=BD=CE=B1
> <img src=3D"{{ business.image.url }}"/> # =CF=80=CE=B1=CF=81=CE=B5 =CE=B5=
=CE=B9=CE=BA=CE=BF=CE=BD=CE=B1 =CE=B1=CF=80=CE=BF =CF=84=CE=BF =CE=B1=CE=BD=
=CF=84=CE=B9=CF=83=CF=84=CE=BF=CE=B9=CF=87=CE=BF url
> {% endif %}
> </p>
> </div>
> {% endblock %}
>
> tutorial/snippets/urls.py
>
> from django.conf.urls import url, include
> from django.contrib import admin
> from rest_framework.urlpatterns import format_suffix_patterns
> from django.contrib.staticfiles.urls import staticfiles_urlpatterns
> from django.conf.urls import include
>
> from . import views
>
> urlpatterns =3D [
> url(r'^admin/', include(admin.site.urls)),
> url(r'^$', views.BusinessList.as_view()),
> url(r'^business/(?P<pk>[0-9]+)/$', views.Business_Detail.as_view()),
> url(r'^users/$', views.UserList.as_view()),
> url(r'^users/(?P<pk>[0-9]+)/$', views.UserDetail.as_view()),
> url(r'^api-auth/', include('rest_framework.urls',
> namespace=3D'rest_framework')),
>
> ]
>
> urlpatterns =3D format_suffix_patterns(urlpatterns)
> urlpatterns +=3D staticfiles_urlpatterns()
>
> tutorial/urls.py
>
> from django.conf.urls import include, url
> from django.contrib import admin
> from django.conf import settings
> from django.contrib.staticfiles.urls import staticfiles_urlpatterns
> from django.conf.urls.static import static
>
>
>
> urlpatterns =3D [
> url(r'^admin/', include(admin.site.urls)),
> url(r'', include('snippets.urls')),
>
> ]
>
> urlpatterns +=3D staticfiles_urlpatterns()
> urlpatterns +=3D static(settings.PHOTO_URL,
> document_root=3Dsettings.PHOTO_ROOT)
>
>
>
> ---------- Forwarded message ----------
> From: Chris Angelico <rosuav@gmail.com>
> To:
> Cc: "python-list@python.org" <python-list@python.org>
> Date: Wed, 25 May 2016 20:30:55 +1000
> Subject: Re: Exended ASCII and code pages [was Re: for / while else
> doesn't make sense]
> On Wed, May 25, 2016 at 8:19 PM, Steven D'Aprano
> <steve+comp.lang.python@pearwood.info> wrote:
> > While the code page system was necessary at
> > the time, the legacy of them today continues to plague computer users,
> causing
> > moji-bake, errors on file systems[1], and holding back the adoption of
> Unicode.
> >
> > [1] I'm speaking from experience there. Take files created on a Windows
> machine
> > using some legacy code page, and try to copy them to another server usi=
ng
> > Unicode, and depending on the intelligence of the server, you may not b=
e
> able
> > to copy them. On the flip side, there are many file names I can easily
> create
> > on Linux but cannot copy to a FAT file system.
>
> And getting a .zip file from a Windows user that had a file in it
> called "Caf=C3=A9 Sounds.something", extracting it on Linux, and finding =
it
> called "Caf\xe9" or something. Very annoying. Fortunately it was only
> the one file in a large directory.
>
> ChrisA
>
>
>
> ---------- Forwarded message ----------
> From: Marko Rauhamaa <marko@pacujo.net>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 13:47:46 +0300
> Subject: Re: for / while else doesn't make sense
> Christopher Reimer <christopher_reimer@icloud.com>:
>
> > Back in the early 1980's, I grew up on 8-bit processors and latin-1 was
> > all we had for ASCII.
>
> You really were very advanced. According to <URL:
> https://en.wikipedia.org/wiki/ISO/IEC_8859-1#History>, ISO 8859-1 was
> standardized in 1985. "Eight-bit-cleanness" became a thing in the early
> 1990's.
>
> Where I was in late 1980's, the terminals were still 7-bit, and
> instead of ASCII, national 7-bit character set variants were being used.
> For example, you might see Pascal code like this:
>
>    =C3=A4 return the net =C3=A5
>    ret :=3D gross=C3=84unit=C3=85 * grossRate
>
> <URL: http://www.aivosto.com/vbtips/charsets-7bit.html>
>
> > Over the last several days from reading this thread (and variations
> > thereof), l've seen several extended characters that I have no clue on
> > how to reproduce on my keyboard. I haven't embraced extended character
> > sets yet, which means I still think of ASCII characters as being 0
> > through 255 (8-bit).
>
> But Latin-1 is on your fingertips? =C2=A1Qu=C3=A9 bueno! Entonces sabes d=
=C3=B3nde
> est=C3=A1n las teclas espa=C3=B1olas, =C2=BFno?
>
>
> Marko
>
>
>
> ---------- Forwarded message ----------
> From: "thomas povtal.org" <thomas@povtal.org>
> To: python-list <python-list@python.org>
> Cc:
> Date: Wed, 25 May 2016 14:04:12 +0200 (CEST)
> Subject: Re: Spurious issue in CPython 2.7.5
> Hi!
>
> Thanks. Replies in-line
> > Den 24. maj 2016 klokken 19:12 skrev Steven D'Aprano <
> steve@pearwood.info>:
> >
> > On Tue, 24 May 2016 08:22 pm, thomas povtal.org wrote:
> >
> > > Hi,
> > >
> > > Please excuse me if this is not the right place, but I have some issu=
es
> > > with CPython on a NUMA machine.
> >
> > Do you mean a Non-Uniform Memory Access machine?
> >
> > Can you be more specific about the actual machine and OS used?
>
> It's Ubuntu 12.04 LTS. It appears as a NUMA machine with two nodes.
> However, I
> later learned that it's (probably?) not a real NUMA but just Ubuntu's way
> of
> representing two socktets for CPUs. I'm not very skilled in such low-leve=
l
> matters, unfortunately.
> > > 1: I get "RuntimeWarning: tp_compare didn't return -1 or -2 for
> > > exception". It's a line like:
> > >
> > > "if Foo =3D False:" where Foo is a global variable (global Foo).
> >
> > What is the type and value of Foo?
>
> global Foo =3D False
> > > Now, I've searched somewhat on google for indications on when this
> > > warning can be seen. However, I haven't really been able to understan=
d
> > > why and even if it's significant or not. (At face value I'm nervous t=
he
> > > Python runtime environment is corrupted for that process).
> >
> > At face value, that RuntimeWarning seems to indicate a bug in the
> > interpreter.
>
> Ok. I was fearing this.
> > > 2: In my process later on I get: "OverflowError: long too big to
> > > convert".
> >
> > Can you copy and paste the actual traceback rather than retyping it fro=
m
> > memory? I think you're missing something, namely what the long is being
> > converted to. The rest of the traceback will help too.
>
> 2016-05-24_08:15:40.84187 File "checkrc.pxd", line 14, in
> zmq.core.checkrc._check_rc (zmq/core/socket.c:5932)
> 2016-05-24_08:15:40.84187 OverflowError: long too big to convert
>
> I agree it looks like cut off, but it isn't...
> > > This happens in different places and seems to always relate to
> > > obtaining a length of something (dict or list created by list
> > > comprehension). Fx
> > >
> > > "for i in xrange(0, len_of_stuff, max_section_size):"
> > >
> > > en_of_stuff is always less than the max long (around 600).
> >
> > What do you mean, "the max long"? Longs do not have a max value. The on=
ly
> > limit is the amount of memory you have.
> >
> > What about max_section_size? How big is that?
>
> 30
> > > We're using gevent and I'm suspecting some "threading" could cause
> > > this, as I'm able to replicate it locally with the same data.
> >
> > Typo: you said later that you are *not* able to replicate it.
> >
> > You're using a global variable with threaded code? You're a brave (or
> > foolhardy) man...
>
> Yeah, I didn't write the code originally, but that's not an excuse. The
> greenlets involved doesn't appear to be mulithreaded in this case, though=
.
> Even
> if it was, could that miss with the interpreter to give these sporious
> messages?
> > --
> > Steven
> >
> > --
> > https://mail.python.org/mailman/listinfo/python-list
>
>
>
> ---------- Forwarded message ----------
> From: Tim Golden <mail@timgolden.me.uk>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 13:13:49 +0100
> Subject: Re: Spurious issue in CPython 2.7.5
> On 25/05/2016 13:04, thomas povtal.org wrote:
> > 2016-05-24_08:15:40.84187 File "checkrc.pxd", line 14, in
> > zmq.core.checkrc._check_rc (zmq/core/socket.c:5932)
> > 2016-05-24_08:15:40.84187 OverflowError: long too big to convert
>
> That exception is arising from ZeroMQ's own code, by the look of it. (Or
> perhaps pyzmq).
>
> It's not impossible that it's arising ultimately from Python's
> interpreter core, but you'd want to take that up with the ZeroMQ guys
> first to see what checks they're doing which might raise that exception.
>
> https://github.com/zeromq
>
> TJG
>
>
>
> ---------- Forwarded message ----------
> From: Christopher Reimer <christopher_reimer@icloud.com>
> To: Marko Rauhamaa <marko@pacujo.net>
> Cc: python-list@python.org
> Date: Wed, 25 May 2016 05:19:01 -0700
> Subject: Re: for / while else doesn't make sense
> > On May 25, 2016, at 3:47 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> >
> > Christopher Reimer <christopher_reimer@icloud.com>:
> >
> >> Back in the early 1980's, I grew up on 8-bit processors and latin-1 wa=
s
> >> all we had for ASCII.
> >
> > You really were very advanced. According to <URL:
> > https://en.wikipedia.org/wiki/ISO/IEC_8859-1#History>, ISO 8859-1 was
> > standardized in 1985. "Eight-bit-cleanness" became a thing in the early
> > 1990's.
>
> Apparently, I wasn't. According to the Internet, which can't be wrong,
> many of the 8-bit computers in the early 1980's were based on 1960's ASCI=
I
> with some non-standard characters tossed in. Latin-1 probably came during
> my DOS days in the 1990's.
>
> As for ISO 8859-1, the standard was approved in 1985 but it was based on
> the character set for the first ANSI standard terminal, DEC VT-2200, that
> came out in 1983. Still early 1980's. ;)
>
> Thank you,
>
> Chris R.
>
>
> ---------- Forwarded message ----------
> From: "thomas povtal.org" <thomas@povtal.org>
> To: Tim Golden <mail@timgolden.me.uk>, python-list <python-list@python.or=
g
> >
> Cc:
> Date: Wed, 25 May 2016 14:26:33 +0200 (CEST)
> Subject: Re: Spurious issue in CPython 2.7.5
>    Hi!
>
>    Thanks. It was an example... I get the very same exception text (the o=
ne
>    that appears to be cut off) in this line in our own code:
>
>    if Foo =3D=3D False:
>
>    (where Foo is global Foo =3D False.)
>
>    :) T
>
>      Den 25. maj 2016 klokken 14:13 skrev Tim Golden <mail@timgolden.me.u=
k
> >:
>
>      On 25/05/2016 13:04, thomas povtal.org wrote:
>      > 2016-05-24_08:15:40.84187 File "checkrc.pxd", line 14, in
>      > zmq.core.checkrc._check_rc (zmq/core/socket.c:5932)
>      > 2016-05-24_08:15:40.84187 OverflowError: long too big to convert
>
>      That exception is arising from ZeroMQ's own code, by the look of it.
> (Or
>      perhaps pyzmq).
>
>      It's not impossible that it's arising ultimately from Python's
>      interpreter core, but you'd want to take that up with the ZeroMQ guy=
s
>      first to see what checks they're doing which might raise that
> exception.
>
>      https://github.com/zeromq
>
>      TJG
>      --
>      https://mail.python.org/mailman/listinfo/python-list
>
>
>
> ---------- Forwarded message ----------
> From: San <santanu01@gmail.com>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 05:29:53 -0700 (PDT)
> Subject: ValueError: I/O operation on closed file
> Hi Gorup,
>
> why i am getting "ValueError: I/O operation on closed file" this error.
> Pls let me know.
>
> Thanks in Advance.
> san
>
>
>
> ---------- Forwarded message ----------
> From: Joel Goldstick <joel.goldstick@gmail.com>
> To:
> Cc: "python-list@python.org" <python-list@python.org>
> Date: Wed, 25 May 2016 09:12:33 -0400
> Subject: Re: ValueError: I/O operation on closed file
> On Wed, May 25, 2016 at 8:29 AM, San <santanu01@gmail.com> wrote:
> > Hi Gorup,
> >
> > why i am getting "ValueError: I/O operation on closed file" this error.
> > Pls let me know.
>
> Because your program is incorrect?
>
> Why not list your code, so that someone might be able to help you?
>
>
> >
> > Thanks in Advance.
> > san
> > --
> > https://mail.python.org/mailman/listinfo/python-list
>
>
>
> --
> Joel Goldstick
> http://joelgoldstick.com/blog
> http://cc-baseballstats.info/stats/birthdays
>
>
>
> ---------- Forwarded message ----------
> From: Daiyue Weng <daiyueweng@gmail.com>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 14:32:34 +0100
> Subject: Find the max number of elements in lists as value in a dictionar=
y
> I want to find the maximal number of elements contained in a nested
> dictionary, e.g.
>
> data =3D {
>         'violations':
>          {
>             'col1': {'err': [elem1, elem2, elem3]},
>             'col2': {'err': [elem1, elem2]}
>          }
>         }
>
> so to find the maximal number of elements in the lists for key 'err' in k=
ey
> 'col1' and 'col2'. Also key 'violations' may contain many keys (e.g. 'col=
1'
> , 'col2', 'col3' etc), so what's the best way to do this (using a loop)?
>
> max =3D 0for col in data.violations:
>    if max < len(data.violations.col.err):
>       max =3D len(data.violations.col.err)
>
>
> cheers
>
>
>
> ---------- Forwarded message ----------
> From: alister <alister.ware@ntlworld.com>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 14:03:17 GMT
> Subject: Re: ValueError: I/O operation on closed file
> On Wed, 25 May 2016 05:29:53 -0700, San wrote:
>
> > Hi Gorup,
> >
> > why i am getting "ValueError: I/O operation on closed file" this error.
> > Pls let me know.
> >
> > Thanks in Advance.
> > san
>
> because you are trying to do something with a file that has been closed
>
> the error message is quite explanatory
>
>
> --
> One friend in a lifetime is much; two are many; three are hardly possible=
.
> Friendship needs a certain parallelism of life, a community of thought,
> a rivalry of aim.
>                 -- Henry Brook Adams
>
>
>
> ---------- Forwarded message ----------
> From: Daiyue Weng <daiyueweng@gmail.com>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 15:19:13 +0100
> Subject: IndexError for using pandas dataframe values
> Hi, I tried to use DataFrame.values to convert a list of columns in a
> dataframe to a numpy ndarray/matrix,
>
> matrix =3D df.values[:, list_of_cols]
>
> but got an error,
>
> IndexError: only integers, slices (:), ellipsis (...), numpy.newaxis
> (None) and integer or boolean arrays are valid indices
>
> so what's the problem with the list of columns I passed in?
>
> many thanks
>
>
>
> ---------- Forwarded message ----------
> From: Jussi Piitulainen <jussi.piitulainen@helsinki.fi>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 17:24:10 +0300
> Subject: Re: Find the max number of elements in lists as value in a
> dictionary
> Daiyue Weng writes:
>
> > I want to find the maximal number of elements contained in a nested
> > dictionary, e.g.
> >
> > data =3D {
> >         'violations':
> >          {
> >             'col1': {'err': [elem1, elem2, elem3]},
> >             'col2': {'err': [elem1, elem2]}
> >          }
> >         }
> >
> > so to find the maximal number of elements in the lists for key 'err' in
> key
> > 'col1' and 'col2'. Also key 'violations' may contain many keys (e.g.
> 'col1'
> > , 'col2', 'col3' etc), so what's the best way to do this (using a loop)=
?
> >
> > max =3D 0for col in data.violations:
> >    if max < len(data.violations.col.err):
> >       max =3D len(data.violations.col.err)
>
> Write a generator function that produces an object that generates the
> lengths. The magic word is the "yield" which is used like "return" but
> makes it so that the resulting objects yields each value on demand. For
> greater magic, make it yield the path to each list together with the
> length (length first, for easy max):
>
> def errcounts(data):
>     for top, sub in data.items():
>         for mid, wev in sub.items():
>             if 'err' in wev:
>                 yield (len(wev['err']), top, mid)
>
> With that, Python's max does it all:
>
> max(errcounts(data)) =3D> (3, 'violations', 'col1')
>
> This anticipated a next question; tuple comparison is overly specific;
> use a key function to max to not overspecify if you care; max needs a
> default in case there is no data; this same thing can be done with a
> single "generator expression" and that might be good, depending on the
> actual details and taste. Many other caveats apply.
>
>
>
> ---------- Forwarded message ----------
> From: Jon Ribbens <jon+usenet@unequivocal.co.uk>
> To: python-list@python.org
> Cc:
> Date: Wed, 25 May 2016 14:28:42 -0000 (UTC)
> Subject: Re: Find the max number of elements in lists as value in a
> dictionary
> On 2016-05-25, Daiyue Weng <daiyueweng@gmail.com> wrote:
> > I want to find the maximal number of elements contained in a nested
> > dictionary, e.g.
> >
> > data =3D {
> >         'violations':
> >          {
> >             'col1': {'err': [elem1, elem2, elem3]},
> >             'col2': {'err': [elem1, elem2]}
> >          }
> >         }
> >
> > so to find the maximal number of elements in the lists for key 'err' in
> key
> > 'col1' and 'col2'. Also key 'violations' may contain many keys (e.g.
> 'col1'
> > , 'col2', 'col3' etc), so what's the best way to do this (using a loop)=
?
> >
> > max =3D 0for col in data.violations:
> >    if max < len(data.violations.col.err):
> >       max =3D len(data.violations.col.err)
>
> In Python 3 you could do:
>
>   max((len(col["err"]) for col in data["violations"].values()), default=
=3D0)
>
> In Python 2 you can do the same but you can't specify "default=3D0" and
> so it will throw an exception if there are no lists found, so you
> could use something like:
>
>   max_errs =3D 0
>   if data["violations"]:
>       max_errs =3D max(len(col["err"]) for col in
> data["violations"].values())
>
>
>
> ---------- Forwarded message ----------
> From: justin walters <walters.justin01@gmail.com>
> To: litssa2005@gmail.com
> Cc: python-list@python.org
> Date: Wed, 25 May 2016 08:06:27 -0700
> Subject: Re: html & python connection problem with hyperlinks
> On Wed, May 25, 2016 at 3:24 AM, <litssa2005@gmail.com> wrote:
>
> > Why not created the field title, that located on the template
> > BusinessList.html as a link to go to Business_Detail.html..? please che=
ck
> >
> > Code:
> >
> > models. py:
> >
> > from django.db import models
> >
> >
> > REGIONS =3D (
> > ('=CE=98=CE=95=CE=A3', '=CE=98=CE=95=CE=A3=CE=A3=CE=91=CE=9B=CE=9F=CE=
=9D=CE=99=CE=9A=CE=97'),
> > ('=CE=A3=CE=95=CE=A1', '=CE=A3=CE=95=CE=A1=CE=A1=CE=95=CE=A3'),
> > ( '=CE=91=CE=98=CE=97', '=CE=91=CE=98=CE=97=CE=9D=CE=91'),
> >
> >
> >
> > TYPEOFBUSINESS =3D (
> > ('=CE=95=CE=A3=CE=A4', '=CE=95=CE=A3=CE=A4=CE=99=CE=91=CE=A4=CE=9F=CE=
=A1=CE=99=CE=91'),
> > ('=CE=A6=CE=91=CE=A1', '=CE=A6=CE=91=CE=A1=CE=9C=CE=91=CE=9A=CE=95=CE=
=99=CE=91'),
> > ('=CE=92=CE=99=CE=92', '=CE=92=CE=99=CE=92=CE=9B=CE=99=CE=9F=CE=A0=CE=
=A9=CE=9B=CE=95=CE=99=CE=91'),
> > ( '=CE=9A=CE=9F=CE=9C', '=CE=9A=CE=9F=CE=9C=CE=9C=CE=A9=CE=A4=CE=97=CE=
=A1=CE=99=CE=91'),
> > ('=CE=A3=CE=99=CE=9D', '=CE=A3=CE=99=CE=9D=CE=95=CE=9C=CE=91')
> >
> > )
> >
> > class Business(models.Model):
> > created_Date =3D models.DateTimeField(auto_now_add=3DTrue)
> > owner =3D models.ForeignKey('auth.User', related_name=3D'snippets',
> null=3DTrue)
> > title =3D models.CharField(max_length=3D100, blank=3DTrue, default=3D''=
)
> > Type_of_Business =3D models.CharField(max_length=3D3, choices=3DTYPEOFB=
USINESS)
> > region =3D models.CharField(max_length=3D3, choices=3DREGIONS)
> > address =3D models.CharField(max_length=3D100, blank=3DTrue, default=3D=
'')
> > phone =3D models.CharField(max_length=3D15, blank=3DTrue, default=3D'')
> > image =3D models.ImageField(null=3DTrue)
> >
> >
> > def __str__(self):
> > return str(self.title)
> >
> > views.py
> >
> > from django.contrib.auth.models import User
> > from django.http import HttpResponse
> > from django.shortcuts import render, get_object_or_404
> > from rest_framework import filters
> > from rest_framework import generics
> > from rest_framework import permissions
> > from snippets.permissions import IsOwnerOrReadOnly
> > from snippets.serializers import SnippetSerializer
> > from snippets.serializers import UserSerializer
> > from .models import Business
> >
> >
> >
> > class UserList(generics.ListAPIView):
> > queryset =3D User.objects.all()
> > serializer_class =3D UserSerializer
> >
> >
> > class UserDetail(generics.RetrieveAPIView):
> > queryset =3D User.objects.all()
> > serializer_class =3D UserSerializer
> >
> > class BusinessList(generics.ListCreateAPIView):
> >
> > permission_classes =3D (permissions.IsAuthenticatedOrReadOnly,)
> > queryset =3D Business.objects.all()
> > serializer_class =3D SnippetSerializer
> > filter_backends =3D (filters.DjangoFilterBackend,filters.SearchFilter,
> > filters.OrderingFilter,)
> > filter_fields =3D ('Type_of_Business', 'region')
> > search_fields =3D ('Type_of_Business', 'region')
> > ordering_fields =3D ('Type_of_Business','title', 'region')
> >
> >
> > def BusinessList(request):
> > business =3D Business.objects.all();
> > return render(request, 'snippets/BusinessList.html'
> {'business':business})
> >
> > def perform_create(self, serializer):
> > serializer.save(owner=3Dself.request.user)
> >
> >
> >
> > class Business_Detail(generics.RetrieveUpdateDestroyAPIView):
> > permission_classes =3D (permissions.IsAuthenticatedOrReadOnly,
> > IsOwnerOrReadOnly,)
> > queryset =3D Business.objects.all()
> > serializer_class =3D SnippetSerializer
> >
> >
> > def Business_Detail(request, pk):
> > business =3D get_object_or_404(Business, pk=3Dpk)
> > return render(request, 'snippets/Business_Detail.html', {'business':
> > business})
> >
> > serializers.py
> >
> > from rest_framework import serializers
> > from snippets.models import Business
> > from django.contrib.auth.models import User
> >
> >
> > class SnippetSerializer(serializers.HyperlinkedModelSerializer):
> > owner =3D serializers.ReadOnlyField(source=3D'owner.username')
> >
> > class Meta:
> > model =3D Business
> > fields =3D ('created_Date', 'owner', 'title','Type_of_Business', 'regio=
n',
> > 'address', 'phone', 'image')
> >
> >
> > class UserSerializer(serializers.ModelSerializer):
> > snippets =3D serializers.PrimaryKeyRelatedField(many=3DTrue,
> > queryset=3DBusiness.objects.all())
> >
> > class Meta:
> > model =3D User
> > fields =3D ('id', 'username', 'snippets')
> >
> > BusinessList.html
> >
> > {% extends 'snippets/base.html' %}
> >
> > {% block content %}
> > {% for business in business%}
> > <div class=3D"business">
> > <div class=3D"date">
> > {{ business.created_Date }} #=CF=84=CF=85=CF=80=CF=89=CF=83=CE=B5 =CE=
=B7=CE=BC=CE=B5=CF=81.=CE=B4=CE=B7=CE=BC=CE=B9=CE=BF=CF=85=CF=81=CE=B3=CE=
=B9=CE=B1=CF=82 =CF=84=CE=BF=CF=85 Business
> > </div>
> > <h1> <a href=3D'{% url 'Business_Detail' pk=3Dbusiness.pk %}'>{{
> > business.title }}</a></h1>
> > <p>{{business.Type_of_Business }}</p>
> > <h2>{{ business.region }} </h2>
> > <h3>{{ business.address }} </h3>
> > <h4>{{ business.phone }} </h4>
> > {% if business.image %}
> > <img src=3D"{{ business.image.url }}"/>
> > {% endif %}
> > </div>
> > {% endfor %}
> > {% endblock %}
> >
> > Business_Detail.html
> >
> > {% extends 'snippets/base.html' %}' %}
> >
> > {% block content %}
> > <div class=3D"business">
> > {% if business.created_Date %} # =CE=B1=CE=BD =CF=85=CF=80=CE=B1=CF=81=
=CF=87=CE=B5=CE=B9 =CE=B7=CE=BC=CE=B5=CF=81=CE=BF=CE=BC=CE=B7=CE=BD=CE=B9=
=CE=B1 =CE=B4=CE=B7=CE=BC=CE=B9=CE=BF=CF=85=CF=81=CE=B3=CE=AF=CE=B1=CF=82
> > <div class=3D"date">
> > {{ business.created_Date }}
> > </div>
> > {% endif %}
> > <h1>{{ business.title }} </h1>
> > <h2>{{ business.region }} </h2>
> > <h3>{{ business.Type_of_Business}} </h3>
> > <h4>{{ business.phone }} </h4>
> > <p>
> > {% if business.image %} # =CE=B1=CE=BD =CF=85=CF=80=CE=B1=CF=81=CF=87=
=CE=B5=CE=B9 =CE=B5=CE=B9=CE=BA=CE=BF=CE=BD=CE=B1
> > <img src=3D"{{ business.image.url }}"/> # =CF=80=CE=B1=CF=81=CE=B5 =CE=
=B5=CE=B9=CE=BA=CE=BF=CE=BD=CE=B1 =CE=B1=CF=80=CE=BF =CF=84=CE=BF =CE=B1=CE=
=BD=CF=84=CE=B9=CF=83=CF=84=CE=BF=CE=B9=CF=87=CE=BF url
> > {% endif %}
> > </p>
> > </div>
> > {% endblock %}
> >
> > tutorial/snippets/urls.py
> >
> > from django.conf.urls import url, include
> > from django.contrib import admin
> > from rest_framework.urlpatterns import format_suffix_patterns
> > from django.contrib.staticfiles.urls import staticfiles_urlpatterns
> > from django.conf.urls import include
> >
> > from . import views
> >
> > urlpatterns =3D [
> > url(r'^admin/', include(admin.site.urls)),
> > url(r'^$', views.BusinessList.as_view()),
> > url(r'^business/(?P<pk>[0-9]+)/$', views.Business_Detail.as_view()),
> > url(r'^users/$', views.UserList.as_view()),
> > url(r'^users/(?P<pk>[0-9]+)/$', views.UserDetail.as_view()),
> > url(r'^api-auth/', include('rest_framework.urls',
> > namespace=3D'rest_framework')),
> >
> > ]
> >
> > urlpatterns =3D format_suffix_patterns(urlpatterns)
> > urlpatterns +=3D staticfiles_urlpatterns()
> >
> > tutorial/urls.py
> >
> > from django.conf.urls import include, url
> > from django.contrib import admin
> > from django.conf import settings
> > from django.contrib.staticfiles.urls import staticfiles_urlpatterns
> > from django.conf.urls.static import static
> >
> >
> >
> > urlpatterns =3D [
> > url(r'^admin/', include(admin.site.urls)),
> > url(r'', include('snippets.urls')),
> >
> > ]
> >
> > urlpatterns +=3D staticfiles_urlpatterns()
> > urlpatterns +=3D static(settings.PHOTO_URL,
> > document_root=3Dsettings.PHOTO_ROOT)
> > --
> > https://mail.python.org/mailman/listinfo/python-list
> >
>
>
>
>
> There are two problems here. You need to define a namespace for
> snippets.urls in tutorials/urls.py:
>
> url(r'', include('snippets.urls', namespace=3D'snippets'))
>
> You also need to give a name to your detail view in snippets/urls.py. Als=
o,
> you do not need to call 'as_view() on function based views like business
> detail:
>
> url(r'^business/(?P<pk>[0-9]+)/$, views.business_detail,
> name=3D'business_detail')
>
> Then, in your list template you can do the following:
>
> <h1><a href=3D"{% url 'snippets:business_detail' pk=3Dbusiness.pk
> %}">{{business.title}}</a></h1>
>
> This will create a linked h1 tag that links to the business detail page.
>
> Hope this helps.
>
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>