# Create two variables to use as inputs to the function fruit = 'Apple' pieces = 'twelve'
# Create a function called describe_fruit that has two parameters, # fruit_type that should be a string and fruit_number which should be an integer. # The output of the function should be a string. def describe_fruit(fruit_type: str, fruit_number: int) -> str: # Create output from the inputs description = "We have " + str(fruit_number) + " pieces of " + fruit_type # Return the output return description
‘We have twelve pieces of Apple’
# Run function with inputs describe_fruit(fruit, pieces)
mypy In Command Line
describe_fruit’s annotations hint that
fruit_number is an integer (
fruit_number: int). However,
fruit_number is a string (
pieces = 'twelve'). Using mypy we can catch that mistake.
static_typing.py:17: error: Argument 2 to “describe_fruit” has incompatible type “str”; expected “int” Found 1 error in 1 file (checked 1 source file)