My python script works well if it is run as python script.py but not when run as ./script.py [duplicate]

Question

My python version is

Python 2.7.12 (default, Nov 20 2017, 18:23:56) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information.

This is my python script:

  def main():
          print " Generating Initial data"
  if __name__ == '__main__':
          main()

If i run it as,

/test$ python gen_in_data.py

 Generating Initial data

it is working fine.

But if I run it as ,

/test$ ./gen_in_data.py
./gen_in_data.py: line 1: syntax error near unexpected token `('
./gen_in_data.py: line 1: `def main():'

it is throwing this error. Please let me know the issue.

This error almost certainly means your shell is running the script, rather than the Python interpreter. By default, executable script are run by the shell; you need a shebang line to specify a different interpreter—in this case, probably /usr/bin/env python or less commonly a hardcoded path like /usr/local/bin/python. (I'm sure this is a dup of an existing question, which will have a more detailed answer that explains things better… just let me find it.) — abarnert
– abarnert, Commented Apr 2, 2018 at 6:35
See this answer for info on the shebang line: stackoverflow.com/a/2429517/6481442 — Jonathan Dayton
– Jonathan Dayton, Commented Apr 2, 2018 at 6:36

Walle Cyril · Accepted Answer · 2018-04-02 06:32:01Z

0

add this at the beginning of the file it is a special comment

#!/usr/bin/python
#-*-coding: utf-8-*-

answered Apr 2, 2018 at 6:32

Walle Cyril

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1 Comment

abarnert Over a year ago

Why? To make sure that his script won't run if Python is in /usr/local/bin, and since nobody's explained to him what this means, he'll be unable to debug it? Or to make sure it's an error if his code isn't in UTF-8?

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