Re: Why is it different from the example on the tutorial?

Newsgroups	comp.lang.python
Date	2014-07-06 09:01 -0700
References	<f949d1c4-98c4-417f-9abc-58fe72b4c0a0@googlegroups.com>
Message-ID	<34cc50af-9a3f-4739-bab4-55e4e321cf9a@googlegroups.com> (permalink)
Subject	Re: Why is it different from the example on the tutorial?
From	Rustom Mody <rustompmody@gmail.com>

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On Sunday, July 6, 2014 5:43:55 PM UTC+5:30, rxj...@gmail.com wrote:
> Hi,

> I type the following sample codes on Python, but it echoes differently.

> Regular expressions are compiled into pattern objects, which have methods for
> various operations such as searching for pattern matches or performing string
> substitutions.

> >>> import re
> >>> p = re.compile('ab*')
> >>> p  

> What I get on Python console:

> $ python
> Python 2.7.5 (default, Oct  2 2013, 22:34:09)
> [GCC 4.8.1] on cygwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import re
> >>> p = re.compile('ab*')
>   File "<stdin>", line 1
>     p = re.compile('ab*')
>     ^
> SyntaxError: invalid syntax

1. For *using* regular exps match is fine
For *hacking in the interpreter* I find findall more convenient.
match and findall take the same arguments

2. I wouldn't bother with compile at least at the start
3. Use raw strings for patterns even if it does not seem necessary (below)

$ python
Python 2.7.7 (default, Jun  3 2014, 16:16:56) 
[GCC 4.8.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from re import findall

>>> findall(r'ab*', 'abcd')
['ab']
>>> findall(r'ab*', 'abcdab')
['ab', 'ab']
>>> findall(r'ab*', 'abcdabbb')
['ab', 'abbb']

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Why is it different from the example on the tutorial? rxjwg98@gmail.com - 2014-07-06 05:13 -0700
  Re: Why is it different from the example on the tutorial? Tim Chase <python.list@tim.thechases.com> - 2014-07-06 07:54 -0500
    Re: Why is it different from the example on the tutorial? rxjwg98@gmail.com - 2014-07-06 06:38 -0700
      Re: Why is it different from the example on the tutorial? Rick Johnson <rantingrickjohnson@gmail.com> - 2014-07-06 07:18 -0700
        Re: Why is it different from the example on the tutorial? Roy Smith <roy@panix.com> - 2014-07-06 10:34 -0400
          Re: Why is it different from the example on the tutorial? Chris Angelico <rosuav@gmail.com> - 2014-07-07 00:45 +1000
          Re: Why is it different from the example on the tutorial? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-07-06 15:47 +0100
          Re: Why is it different from the example on the tutorial? Rick Johnson <rantingrickjohnson@gmail.com> - 2014-07-06 08:53 -0700
            Re: Why is it different from the example on the tutorial? Roy Smith <roy@panix.com> - 2014-07-06 12:01 -0400
        Re: Why is it different from the example on the tutorial? rxjwg98@gmail.com - 2014-07-06 08:03 -0700
          Re: Why is it different from the example on the tutorial? Peter Otten <__peter__@web.de> - 2014-07-06 17:46 +0200
          Re: Why is it different from the example on the tutorial? Rick Johnson <rantingrickjohnson@gmail.com> - 2014-07-06 09:02 -0700
          Re: Why is it different from the example on the tutorial? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-07-06 19:29 +0100
          Re: Why is it different from the example on the tutorial? Larry Hudson <orgnut@yahoo.com> - 2014-07-06 13:32 -0700
            Re: Why is it different from the example on the tutorial? rxjwg98@gmail.com - 2014-07-06 13:42 -0700
      Re: Why is it different from the example on the tutorial? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-07-06 15:25 +0100
  Re: Why is it different from the example on the tutorial? Rustom Mody <rustompmody@gmail.com> - 2014-07-06 09:01 -0700

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