Python 3 - First Program (02)

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To download Python, visit www.python.org

 

Writing a Python Program

Python programs must be written with a particular structure. The syntax must be correct, or the interpreter will generate error messages and not execute the program. This section introduces Python by providing a simple example program. Listing 1.1 (simple.py) is one of the simplest Python programs that does something:

print("This is a simple Python program")

Note: The small numbers that appear to the left of the box containing the Python code are not part of the program; the numbers are shown to allow us to easily reference a specific line in the code if necessary. We will consider two ways in which we can run Listing 1.1 (simple.py):

  1. enter

the program directly into IDLE’s interactive shell and 

  2. enter the program into IDLE’s editor, save it, and run it. 

print("This is a simple Python program")

  This is a Python statement. A statement is a command that the interpreter executes. This statement prints the message This is a simple Python program on the screen. A statement is the fundamental unit of execution in a Python program. Statements may be grouped into larger chunks called blocks, and blocks can make up more complex statements. Higher-order constructs such as functions and methods are composed of blocks. The statement makes use of a built in function named print. Python has a variety of different kinds of statements that may be used to build programs, and the chapters that follow explore these various kinds of statements.

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