Functions
Functions
Some tasks need to be performed multiple times within a program. Rather than rewrite the same code in multiple places, a function may be defined using the def keyword. Function definitions may include parameters, providing data input to the function.
Functions may return a value using the return keyword followed by the value to return.
Function Parameters
Sometimes functions require input to provide data for their code. This input is defined using parameters.
Parameters are variables that are defined in the function definition. They are assigned the values which were passed as arguments when the function was called, elsewhere in the code.
For example, the function definition defines parameters for a character, a setting, and a skill, which are used as inputs to write the first sentence of a book.
Multiple Parameters
Python functions can have multiple parameters. Just as you wouldn’t go to school without both a backpack and a pencil case, functions may also need more than one input to carry out their operations.
To define a function with multiple parameters, parameter names are placed one after another, separated by commas, within the parentheses of the function definition.