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What does """ means in python?

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  What does """ means in python? Sam <lightaiyee@gmail.com> - 2014-02-08 06:02 -0800
    Re: What does """ means in python? Roy Smith <roy@panix.com> - 2014-02-08 09:08 -0500
      Re: What does """ means in python? Walter Hurry <walterhurry@gmail.com> - 2014-02-08 19:55 +0000
        Re: What does """ means in python? Chris Angelico <rosuav@gmail.com> - 2014-02-09 08:40 +1100
        Vedr: What does """ means in python? Gisle Vanem <gvanem@yahoo.no> - 2014-02-09 05:49 +0000
          Re: Vedr: What does """ means in python? Duncan Booth <duncan.booth@invalid.invalid> - 2014-02-10 10:50 +0000

#65678 — What does """ means in python?

For string, one uses "" to represent string. Below is a code fragment that uses """ instead.

cursor.execute("""SELECT name, phone_number 
                  FROM coworkers 
                  WHERE name=%s 
                  AND clue > %s 
                  LIMIT 5""",
               (name, clue_threshold))

What does """ means in python?

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#65679

In article <72a7dd52-7619-4520-991e-20db7ce55ba3@googlegroups.com>,
 Sam <lightaiyee@gmail.com> wrote:

> For string, one uses "" to represent string. Below is a code fragment that 
> uses """ instead.
> 
> cursor.execute("""SELECT name, phone_number 
>                   FROM coworkers 
>                   WHERE name=%s 
>                   AND clue > %s 
>                   LIMIT 5""",
>                (name, clue_threshold))
> 
> What does """ means in python?

This is what's known as a "triple quoted string"  It's just like a 
regular string, except that it run across newlines.  Very handy for 
things like embedding SQL code in a Python program!

It works with single quotes too (i.e. '''this is
a very long string
spread out over several lines'''

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#65693

Roy Smith wrote:

> In article <72a7dd52-7619-4520-991e-20db7ce55ba3@googlegroups.com>,
>  Sam <lightaiyee@gmail.com> wrote:
>
>> For string, one uses "" to represent string. Below is a code fragment that 
>> uses """ instead.
>> 
>> cursor.execute("""SELECT name, phone_number 
>>                   FROM coworkers 
>>                   WHERE name=%s 
>>                   AND clue > %s 
>>                   LIMIT 5""",
>>                (name, clue_threshold))
>> 
>> What does """ means in python?
>
> This is what's known as a "triple quoted string"  It's just like a 
> regular string, except that it run across newlines.  Very handy for 
> things like embedding SQL code in a Python program!
>
> It works with single quotes too (i.e. '''this is
> a very long string
> spread out over several lines'''

PMFJI.

When I asked (here) about this a while ago, some kind soul suggested textwrap.dedent.

Any advice as to the pros and cons of the respective approaches (esp. for SQL)?

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#65694

On Sun, Feb 9, 2014 at 6:55 AM, Walter Hurry <walterhurry@gmail.com> wrote:
> When I asked (here) about this a while ago, some kind soul suggested textwrap.dedent.
>
> Any advice as to the pros and cons of the respective approaches (esp. for SQL)?

For SQL? Ignore the extra spaces, it's a free-form language. The only
reason to consider dedent() would be if you're worried about how your
log files will look. The actual execution of SQL won't be bothered by
newlines and spaces/tabs.

ChrisA

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#65725 — Vedr: What does """ means in python?

 
Gisle V.


"Computers are useless. They can only give answers"  --Pablo Picasso
Chris Angelico <rosuav@gmail.com> wrote:

> For SQL? Ignore the extra spaces, it's a free-form language. The only
> reason to consider dedent() would be if you're worried about how your
> log files will look. The actual execution of SQL won't be bothered by
> newlines and spaces/tabs.

Regrading handy uses of ''', you learned me one trick when using Python 
code in a Windows .bat file:


  rem = '''
  @echo off
  echo This is 
batch
  \python32\python %0
  echo All done
  exit /b
  rem '''
  import 
sys
  print("This is Python")
  for i,p in 
enumerate(sys.path):
     print('sys.path[%2d]: %s' % (i, p))
  print("Python 
done")

You'll have a variable in Python called 'rem' which contains all 
your
batch code :) It exploits the fact that 'rem' makes a 
one-line
comment, but the triple quotes go across multiple lines.

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#65807 — Re: Vedr: What does """ means in python?

Gisle Vanem <gvanem@yahoo.no> wrote:

> Regrading handy uses of ''', you learned me one trick when using Pythonÿ
> code in a Windows .bat file:
> 
>  rem = '''
>  @echo off
>  echo This is batch
>  \python32\python %0
>  echo All done
>  exit /b
>  rem '''
>  import sys
>  print("This is Python")
>  for i,p in enumerate(sys.path):
>     print('sys.path[%2d]: %s' % (i, p))
>  print("Python done")
> You'll have a variable in Python called 'rem' which contains all 
> your
> batch code :) It exploits the fact that 'rem' makes a 
> one-line
> comment, but the triple quotes go across multiple lines.
> 
A better trick would be to use a Powershell script instead of a batch 
file:

-------------------------------------------
filter python() { $_ | c:\Python33\python.exe ($args -replace'(\\*)"','$1$1\"') }

Write-Host "This is the powershell script"

dir cert: | convertto-json | python -c @"
import json, sys
stores = json.loads(sys.stdin.read())
print("This is Python")
for store in stores:
    print("{}: {}".format(store['PSChildName'], ', '.join(store['StoreNames'])))
print("Python done")
"@

Write-Host "All done"
-------------------------------------------
C:\scripts> . .\Pythoncerts.ps1
This is the powershell script
This is Python
CurrentUser: Root, UserDS, Disallowed, Trust, My, TrustedPublisher, SmartCardRoot, TrustedPeople, ADDRESSBOOK, AuthRoot,
 McAfee Trust, CA, REQUEST, ACRS
LocalMachine: Disallowed, Trust, CA, TrustedPublisher, SmartCardRoot, My, TrustedPeople, AuthRoot, TrustedDevices, Root
Python done
All done
C:\scripts>

Notes on the above:

Powershell messes up arguments when running legacy programs. The filter 
ensures that all arguments pass through Windows command line processing 
unscathed (except they can't contain null characters). You don't actually 
have to use the filter if you are careful about how you write quotes in the 
code, but it makes life simpler.

Python scripts up to just over 32,000 characters can be written on the 
command line this way. You can also assign the script to a variable and 
keep the Python command a bit cleaner:

   $script = @"
   print("Python here!")
   "@
   python -c $script

Or without the filter it is best to avoid the double quotes:

   $script = @"
   print('Python here!')
   "@
   c:\python33\python.exe -c $script

To run from a traditional cmd.exe prompt you have to explicitly use 
Powershell. The default file associations for .ps1 files will run notepad 
instead.

If your system execution policy is Restricted (the default) use:

    powershell -executionpolicy RemoteSigned .\Pythoncerts.ps1

Otherwise set the execution policy to something more lenient (at a 
Powershell prompt running as administrator enter "Set-ExecutionPolicy 
RemoteSigned") and you can just do:

    powershell .\Pythoncerts.ps1

I also use Powershell interactively so I have the filters defined in my 
startup ($Home\Documents\WindowsPowerShell\profile.ps1):

  filter py() { $_ | py.exe ($args -replace'(\\*)"','$1$1\"') }
  filter python() { $_ | c:\Python33\python.exe ($args -replace'(\\*)"','$1$1\"') }

-- 
Duncan Booth

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