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Date: Mon, 1 Jun 2015 09:23:02 +1000
Subject: Re: What use for reversed()?
From: Tim Delaney <timothy.c.delaney@gmail.com>
To: Python-List <python-list@python.org>
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On 1 June 2015 at 05:40, fl <rxjwg98@gmail.com> wrote:

> Hi,
>
> I have a string b='1234'. I run: br=reversed(b)
>
> I hope that I can print out '4321' by:
>
> for br in b
>
> but it complains:
> SyntaxError: invalid syntax
>

Any time you get a SyntaxError, it means that you have coded something
which does not match the specified syntax of the language version.

Assuming you copied and pasted the above, I can see an error:

    for br in b

The for statement must have a colon at the end of line e.g. a complete for
statement and block is:

for br in b:
    print br

This will output the characters one per line (on Python 3.x), since that is
what the reversed() iterator will return. You will need to do something
else to get it back to a single string.

Have you read through the python tutorials?

https://docs.python.org/3/tutorial/

or for Python 2.x:

https://docs.python.org/2/tutorial/

Tim Delaney

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On 1=
 June 2015 at 05:40, fl <span dir=3D"ltr">&lt;<a href=3D"mailto:rxjwg98@gma=
il.com" target=3D"_blank">rxjwg98@gmail.com</a>&gt;</span> wrote:<br><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-w=
idth:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding=
-left:1ex">Hi,<br>
<br>
I have a string b=3D&#39;1234&#39;. I run: br=3Dreversed(b)<br>
<br>
I hope that I can print out &#39;4321&#39; by:<br>
<br>
for br in b<br>
<br>
but it complains:<br>
SyntaxError: invalid syntax<br></blockquote><div><br></div><div>Any time yo=
u get a SyntaxError, it means that you have coded something which does not =
match the specified syntax of the language version.</div><div><br></div><di=
v>Assuming you copied and pasted the above, I can see an error:</div><div><=
br></div><div>=C2=A0 =C2=A0 for br in b<br></div><div><br></div><div>The fo=
r statement must have a colon at the end of line e.g. a complete for statem=
ent and block is:</div><div><br></div><div>for br in b:</div><div>=C2=A0 =
=C2=A0 print br</div><div><br></div><div>This will output the characters on=
e per line (on Python 3.x), since that is what the reversed() iterator will=
 return. You will need to do something else to get it back to a single stri=
ng.</div><div><br></div><div>Have you read through the python tutorials?</d=
iv><div><br></div><div><a href=3D"https://docs.python.org/3/tutorial/">http=
s://docs.python.org/3/tutorial/</a><br></div><div><br></div><div>or for Pyt=
hon 2.x:</div><div><br></div><div><a href=3D"https://docs.python.org/2/tuto=
rial/">https://docs.python.org/2/tutorial/</a><br></div><div><br></div><div=
>Tim Delaney=C2=A0<br></div></div></div></div>

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