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# Functions in Python

schedule Aug 12, 2023
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 functiongreeting("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 functiongreeting() 'Good day Tony' ```

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

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