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AKalairPost at 2010-2-15 04:36 | Show This Author's Posts Only
abstract:

re.search(list, 'th')
But nothing happens when I run this in the Python shell.
I'm using Python  v2.5.4
Any ideas?
Thanks


Hi,
Im trying to search for a partial match within a list in Python.
For example
list = ['the', 'cat', 'bee']
Now I want to see if anything begins with 'th'
I've done some research and found some information on regular expression such as:
re.search(list, 'th')
But nothing happens when I run this in the Python shell.
I'm using Python  v2.5.4
Any ideas?
Thanks

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targPost at 2010-2-15 04:36 | Show This Author's Posts Only
First, the regular expression for finding "th" only at the beginning is "^th".
Your problem is, re functions only work on strings directly, not a list of strings.  So for example you could filter the list for the items that match:
Code:
  1. [string for string in list if re.match("^th", string)]
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3#
ghostdog74Post at 2010-2-15 04:36 | Show This Author's Posts Only
no need regex
Code:
  1. for item in mylist:
  2.     if item.startswith("th"):
  3.        print item
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4#
AKalairPost at 2010-2-15 04:36 | Show This Author's Posts Only
Hi,
Thanks for the help guys maybe someone could spot my mistake?
Why does this return false when it shouldn't
For example the letter 'h' returns false when theirs obviously words beginning with 'h' ?
The wordlist is here:
Link
Code :
Code:
  1. def can_word_be_made(word, wordlist):
  2.     for item in wordlist:
  3.         if item.startswith(word):
  4.             return True
  5.         else:
  6.             return False
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Any ideas? Thanks !

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5#
SuperOscarPost at 2010-2-15 04:36 | Show This Author's Posts Only
abstract:

re.search(list, 'th')
But nothing happens when I run this in the Python shell.
I'm using Python  v2.5.4
Any ideas?
Thanks



Originally Posted by AKalair
Thanks for the help guys maybe someone could spot my mistake?
Why does this return false when it shouldn't
Well, it’s obvious: it returns right after checking the first item.

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6#
dwblasPost at 2010-2-15 04:36 | Show This Author's Posts Only

  For example the letter 'h' returns false when theirs obviously words beginning with 'h' ?
The words are all caps.  Convert both before testing.
Code:
  1. def can_word_be_made(word, wordlist):
  2.     word_caps = word.upper()
  3.     for item in wordlist:
  4.         if item.upper().startswith(word_caps):
  5.             return True
  6.         else:
  7.             return False
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re.search(list, 'th')
But nothing happens when I run this in the Python shell.
I'm using Python  v2.5.4
Any ideas?
Thanks

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