Time for action – defining functions

Let's define the following simple function:

  1. Print Hello and a given name in the following way:
    >>> def print_hello(name):
...     print('Hello ' + name)
...

    Call the function as follows:

    >>> print_hello('Ivan')
Hello Ivan
  2. Some functions do not have arguments, or the arguments have default values. Give the function a default argument value as follows:
    >>> def print_hello(name='Ivan'):
...     print('Hello ' + name)
...
>>> print_hello()
Hello Ivan
  3. Usually, we want to return a value. Define a function, which doubles input values as follows:
    >>> def double(number):
...     return 2 * number
...
>>> double(3)
6

What just happened?

We learned how to define functions. Functions can have default argument values and return values.

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