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Functions in Python

Programming
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Python
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Functions
schedule Mar 10, 2022
Last updated
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We can write our own functions in Python to perform things not supported by built-in functions alone.

The below piece of code represents the basic structure of a function:

def greeting(name, time_of_day): # header
"""Return a greeting to someone based on the time of day.
>>> greeting('Bob', 'evening')
"Good evening Bob"
"""
return ("Good " + time_of_day + " " + name)

#Call the function
greeting("Sara", 'morning')
'Good morning Sara'

The docstring in triple quotes directly after the header provides a description of what the function does. This is displayed when we call help(~) on the function.

Default arguments

We can provide default values for arguments when defining a function:

def greeting(name="Tony", time_of_day="day"): # header
"""Return a greeting to someone based on the time of day.
>>> greeting('Bob', 'evening')
"Good evening Bob"
"""
return ("Good " + time_of_day + " " + name)

#Call the function
greeting()
'Good day Tony'

Now we can call greeting() without passing any arguments and the default values will be used.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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