On Wed, Aug 15, 2012 at 1:38 AM, <light1qu...@gmail.com> wrote:
> def testFunc(startingList):
> xOnlyList = [];
> for str in startingList:
> if (str[0] == 'x'):
> print str;
> xOnlyList.append(str)
> startingList.remove(str) #this seems to be the problem
> print xOnlyList;
> print startingList
> testFunc(['xasd', 'xjkl', 'sefwr', 'dfsews'])
Other people have explained the problem with your code. I'll take this
example as a way of introducing you to one of Python's handy features
- it's an idea borrowed from functional languages, and is extremely
handy. It's called the "list comprehension", and can be looked up in
the docs under that name,
def testFunc(startingList):
xOnlyList = [strng for strng in startingList if strng[0] == 'x']
startingList = [strng for strng in startingList if strng[0] != 'x']
print(xOnlyList)
print(startingList)
It's a compact notation for building a list from another list. (Note
that I changed "str" to "strng" to avoid shadowing the built-in name
"str", as others suggested.)
(Unrelated side point: Putting parentheses around the print statements
makes them compatible with Python 3, in which 'print' is a function.
Unless something's binding you to Python 2, consider working with the
current version - Python 2 won't get any more features added to it any
more.)
Python's an awesome language. You may have to get your head around a
few new concepts as you shift thinking from PHP's, but it's well worth
while.
Chris Angelico
--
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