check if it's File

Question

I have written very small code to check if it's file. I was expecting I should get "yes" print but I did not get. Am I doing any silly mistake.

os.listdir(os.getcwd()+"/../py")
a = ['a.py', 'a.pyc']
>>> for _a in a:
...  if os.path.isfile(_a):
...     print "yes"

Answer 1

You need to provide a full path ; you are only providing a relative path, so Python looks in the current working directory for these and there is no file named a.py in os.getcwd() .

Start by storing the path to the other directory in a variable:

path = os.path.abspath('../py')
for name in os.listdir(path):
    if os.path.isfile(os.path.join(path, name):
        print "yes", name, "is a file!"

I used os.path.abspath() instead of os.getcwd() to turn your relative path into a normalized absolute path, and used os.path.join() to then use that path to construct absolute paths for the list of names that os.listdir() returned.

Answer 2

a.py looks for the file named a.py in the current directory . Your code seems to imply that you should be supplying a path ( ../py ?)

For example:

>>> for _a in a:
...  if os.path.isfile(os.path.join('../py', _a)):
...     print "yes"