How to Code in Python


Python is an interpreted scripting language with simple, readable code intended to be intuitive and even fun to use --- hence its name, derived from Monty Python's Flying Circus. Learning Python is remarkably easy, due to both its simplicity and the detailed documentation available online. A simple Python code can be typed up and run in less than five minutes.

  • Download and Python. If you use Windows, enter "cmd" in the Run dialog or the Start Menu search bar and run "set path=%path%;C:\python32" at the prompt. This will add Python to your computer's path environment variable, allowing it to be easily run at the command line.

  • Open a simple text editor such as Notepad or gedit. If you run a Unix-based operating system such as Linux or OSX, type the following as the first line of the file:

    ! /usr/bin/env python3.2

    This will allow you to run the program as a standalone script.

  • Use the "Import" command to include an external library in your code. The "sys" library contains many useful functions, allowing you to do things such as detect and use command-line arguments. Type the following line of code:

    import sys

  • Use variables without declaring them ahead of time. Unlike traditional programming languages such as C++, Python is dynamically, implicitly typed, allowing it to detect variable types on the fly. To assign command-line argument 0, the script's filename, to a string variable, enter the following line of code:

    name = sys.argv[0]

  • Use the + operator for both adding numbers and concatenating strings. Because Python is an object-oriented language, arithmetic operators can be used in all sorts of surprising ways, even allowing you to multiply strings. Enter the following lines of code:

    howdy = "Hello, "

    greeting = howdy * 3 + "World! My name is " + name + "!"


  • Save your file as "" in your home folder. If you are using a Unix variant, open a shell terminal and enter "chmod u+x" to make your script executable.

  • Run your program. If you're using Windows, type "python3.2" at the command line. This can be abbreviated to "./" on Unix variants. The program output should look like this:

    Hello, Hello, Hello, World! My name is!

Tips & Warnings

  • If you're using a newer or older version of Python, replace "python3.2" in your code and shell commands with the appropriate version number.

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