- How can I define new functions?
- What’s the difference between defining and calling a function?
- What happens when I call a function?
- Define a function that takes parameters.
- Return a value from a function.
- Set default values for function parameters.
- Document our functions.
- Explain why we should divide programs into small, single-purpose functions.
Alternate video link.
Jupyter Notebook File
Please use the Jupyter notebook named "07CreatingFunctions.ipynb" for this lesson. If you haven't downloaded them already, you may find them here.
- Define a function using
- The body of a function must be indented.
- Call a function using
- Numbers are stored as integers or floating-point numbers.
- Variables defined within a function can only be seen and used within the body of the function.
- If a variable is not defined within the function it is used, Python looks for a definition before the function call
help(thing) to view help for something.
- Put docstrings in functions to provide help for that function.
- Specify default values for parameters when defining a function using
name=value in the parameter list.
- Parameters can be passed by matching based on name, by position, or by omitting them (in which case the default value is used).