Which one is good practice about python formatted string?

Question

Suppose I have a file on /home/ashraful/test.txt. Simply I just want to open the file. Now my question is:

which one is good practice?

Solution 1:

dir = "/home/ashraful/"
fp = open("{0}{1}".format(dir, 'test.txt'), 'r')

Solution 2:

dir = "/home/ashraful/"
fp = open(dir + 'test.txt', 'r')

The both way I can open file.

Thanks :)

Answer 1

instead of concatenating string use os.path.join os.path.expanduser to generate the path and open the file. (assuming you are trying to open a file in your home directory)

with open(os.path.join(os.path.expanduser('~'), 'test.txt')) as fp:
    # do your stuff with file