[EMAIL PROTECTED] a écrit :
> Hi
>
> startswith( prefix[, start[, end]]) States:
>
> Return True if string starts with the prefix, otherwise return False.
> prefix can also be a tuple of suffixes to look for. However when I try
> and add a tuple of suffixes I get the following error:
>
> Type Error: expected a character buffer object
>
> For example:
>
> file = f.readlines()
> for line in file:
slightly OT, but:
1/ you should not use 'file' as an identifier, it shadowas the builtin
file type
2/ FWIW, it's also a pretty bad naming choice for a list of lines - why
not just name this list 'lines' ?-)
3/ anyway, unless you need to store this whole list in memory, you'd be
better using the iterator idiom (Python files are iterables):
f = open('some_file.ext')
for line in f:
print line
> if line.startswith(("abc","df"))
> CODE
>
> It would generate the above error
May I suggest that you read the appropriate version of the doc ? That
is, the one corresponding to your installed Python version ?-)
Passing a tuple to str.startswith is new in 2.5. I bet you're trying it
on a 2.4 or older version.
> To overcome this problem, I am currently just joining individual
> startswith methods
> i.e. if line.startswith("if") or line.startswith("df")
> but know there must be a way to define all my suffixes in one tuple.
You may want to try with a regexp, but I'm not sure it's worth it (hint:
the timeit module is great for quick small benchmarks).
Else, you could as well write your own testing function:
def str_starts_with(astring, *prefixes):
startswith = astring.startswith
for prefix in prefixes:
if startswith(prefix):
return true
return false
for line in f:
if str_starts_with(line, 'abc, 'de', 'xxx'):
# CODE HERE
HTH
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