Python - Ioerror: [errno 2] No Such File Or Directory: U'lastid.py' For File In Same Directory. Works Locally, Doesn't On Heroku

I suspect this is a very newbie question but I can't find any solutions that are helping :( I've been trying to get started with Python by building a simple Twitter bot which repl

Solution 1:

Probably the python interpreter is being executed from a different directory than where your script lives.

Here's the same setup:

oliver@aldebaran/tmp/junk $ cat test.txt 
a
b
c
baseoliver@aldebaran/tmp/junk $ cat sto.py 
withopen('test.txt', 'r') as f:
    for line in f:
        print(line)
baseoliver@aldebaran/tmp/junk $ python sto.py 
a

b

c

baseoliver@aldebaran/tmp/junk $ cd ..
baseoliver@aldebaran/tmp $ python ./junk/sto.py 
Traceback (most recent calllast):
  File "./junk/sto.py", line 1, in<module>withopen('test.txt', 'r') as f:
IOError: [Errno 2] No such file or directory: 'test.txt'

To solve this, import os and use absolute pathnames:

import os
MYDIR = os.path.dirname(__file__)
with open(os.path.join(MYDIR, 'test.txt')) as f:
    pass
    # and so on