Python - IOError: No such file or directory: u'...' problem solving

The python interpreter is an example of an error executing in a different directory than the script is in:

(tensorflow) [root@localhost python]# cat test.txt 
a
b
c

py file in the same directory:

(tensorflow) [root@localhost python]# cat sto.py 
with open('test.txt', 'r') as f:
    for line in f:
        print(line)

Return to the parent directory:

cd..

Run the sto.py file:

(tensorflow) [root@localhost vagrant]# python ./python/sto.py 
Traceback (most recent call last):
  File "./python/sto.py", line 1, in <module>
    with open('test.txt', 'r') as f:
IOError: [Errno 2] No such file or directory: 'test.txt'

Solution: Use os to add the current directory to the system path:

(tensorflow) [root@localhost python]# vim sto.py 
import os
MYDIR = os.path.dirname(__file__)
with open(os.path.join(MYDIR, 'test.txt')) as f:
    for line in f:
        print(line)

Run again:

(tensorflow) [root@localhost vagrant]# python ./python/sto.py 
a

b

c

Reference: [ https://stackoverflow.com/questions/27975415/python-ioerror-errno-2-no-such-file-or-directory-ulastid-py-for-file-in]