I am following this guide for python 2.7 : http://docs.python.org/tutorial/interpreter.html I do all it says: I have a python file:
#! /usr/bin/env python
print "hello world !\n"
And from terminal, in the directory where is the file I type:
chmod +x hello_world.py
The file is name hello_world.py; But nothing happens, it doesn't print "hello world\n".
sorry if this is insultingly obvious, but
> chmod +x hello_world.py
only changes the file so that you can run it. next you need to actually run the file by typing:
> ./hello_world.py
hello world !
To give a bit more description: the chmod command changes the permissions of a file on a Unix-style system. The +x in the command:
chmod +x hello_world.py
Sets the "Executable" bit for the hello_world.py file, thereby making it a script which can be executed. Thus to run the script:
./hello_world.py
The ./ in front indicates that the file is in the current directory. Alternatively, you can always run a script by invoking the python interpreter directly (regardless of permissions) like so:
python hello_world.py
