On 10/12/07, Dick Moores <[EMAIL PROTECTED]> wrote:
- Please see the code and it's output here:
- < http://www.rcblue.com/Python/buggy_For_Web.py>
- I'm attempting to eliminate the elements (strings) of lstA that are
- not well-formed in that they contain at least one character that is
- not in the string astr.
Hi Dick,
If your interested, this could be done succinctly with set types. (no iterating required!)
Hey, I'm VERY interested.
def well_formed(word):
return not set('#.<@') & set(word)
>>> well_formed('porkpie')
True
>>> well_formed('p#rkpie')
False
And then it seems you are coming to terms with list comprehensions...
my_list = [word for word in my_list if well_formed(my_word)]
Done. I had no idea set could be used that way! With a couple of modifications, I used your ideas in both <buggy_For_Web5b.py> and <getCrew_ForWeb2.py> (see the thread I started, < http://www.nabble.com/An-idea-for-a-script-tf4603558.html#a13149808 >).
OR...
my_list = filter(well_formed, my_list)
I'll look into "filter".
A question:
Here's my(yours) well_formed():
def well_formed(word, astr):
"""
Returns True if set(<a string>) - set(<a string>) is empty; False if not.
"""
return not set(word) - set(astr)
Is it OK to use <a string> like that in a docstring?
Thanks, Ian.
Dick
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