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Mastering Python: Annotations, Errors and Environment
Mastering Python: Annotations, Errors and Environment
Return Annotation
The return annotation is used in functions to indicate what type of data will be returned. This annotation is created using the ->
syntax:
def addition(first: int, second: int) -> int: return first + second print(addition(15, 12))
Return annotations are helpful for both function users and writers, as they indicate if the function is returning an unexpected data type:
The division operator (/
) returns a float
value, but if we expect an int
, the return annotation can help us identify this potential bug in our function.
Note
To create the return annotation, you need to use the
->
and type (e.g.,str
) between closed parenthesis)
and colon:
.
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