Functions - Open Michigan
Functions
Chapter 4
Python for Informatics: Exploring Information
Unless otherwise noted, the content of this course material is licensed under a Creative Commons Attribution 3.0 License. .
Copyright 2010- Charles R. Severance
Stored (and reused) Steps
def
hello()
print lZipz
hello()
hello():
print 'Hello'
print 'Fun'
Program:
def thing():! print 'Hello'! print 'Fun'!
! thing()! print 'Zip'!
thing()
Output:
Hello
Fun
Zip
Hello
Fun
We call these reusable pieces of code lfunctionsz.
Python Functions
? There are two kinds of functions in Python.
? Built-in functions that are provided as part of Python - raw_input(),
type(), float(), int() ...
? Functions that we define ourselves and then use
? We treat the of the built-in function names as "new" reserved words
(i.e. we avoid them as variable names)
Function Definition
? In Python a function is some reusable code that takes arguments(s) as
input does some computation and then returns a result or results
? We define a function using the def reserved word
? We call/invoke the function by using the function name, parenthesis
and arguments in an expression
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