En Fri, 13 Jun 2008 04:37:44 -0300, Nader <[EMAIL PROTECTED]> escribió:
Hello,
I read some files name from a directory and then I put these name in a
list. I will check whether it is empty or not, and I would do it with
an exception. With if statement it is very simple:
If list_of_files != "" : # this can be if list_of_files !=
[]:
get the files
elas:
there is no file
If it is simple, just do it! Why do you want to make things more
complicated? This would be enough:
if list_of_files:
get_the_files(list_of_files)
else:
print "there is no file"
(a list has a false boolean value when it is empty)
But with exception, I can write something as:
try:
list_of_files != []
get the files
except ValueError:
Print " there is no file"
What can the first statement be inside 'try' if I don't want to use if
statement?
If you insist on using an exception (and assuming list_of_files is
actually a list, not a string or other kind of sequence):
try:
list_of_files[0]
except IndexError:
...no files...
This way you're checking that list_of_files contains at least one element.
But I would not reccomend it.
--
Gabriel Genellina
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