This article describes how to write and execute a "Hello World" program in Python on Linux (Fedora).

1. the prerequisites

• a text editor of your choice (e.g. vi)
• a python interpreter

make sure you have installed the python rpm:

# rpm -qa python
python-2.5.1-26.fc8.2 

If it is not installed yet, you can install it with yum (you need to be root to do that):

# yum install python

2. write the code

open an empty file with a text editor (e.g. vi):

# vi helloworld.py

#!/usr/bin/python
print "Hello World!";

explanation

#!/usr/bin/python

This tells the system to use the /usr/bin/python interpreter to execute the script. You can find out the full path of your python interpreter by entering the following command:

# which python
/usr/bin/python

print "Hello World!";

This prints out the string "Hello World!".

3. make the script executable

# chmod u+x helloworld.py

4. run the program

you can now execute the script program with:

# ./helloworld.py
Hello World!

- or -

# python helloworld.py
Hello World!

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