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Running Python file

Writing Python code in a file and running.

Step 1: Open text editor of your choice, ex: Notepad++, or Vim

Step 2: Write code in to the file

Step 3: Save file with a .py extension ex: first.py


Step 4: Run CMD or power shell

Step 5: cd to the directory where the Python file is saved

Step 6: Run the file with

python3 first.py

Contents of first.py


#open a new file

#Write below code

#save as first.py

#run on cmd line

print("My first python program file!")





Step 4:In Unix/Linux flavors, first line of your python program, should to point to python interpreter.

It starts with #! (shebang) fallowed by path of the python interpreter.

Usually it will be one of the below, add this line your file if not added.





#!/user/bin/env python

you can find this by typing

whereis python or which python

on shell, after adding Python interpreter path, save the file.

Step 5: Give permission to file ex: chmod 777 first.py

Step 6:  Run first.py by below command.

python first.py



Contents of first.py


#open a new file

#Write below code

#save it as first.py

#run on shell 


print("My first python program file!")