Is there a way to make a type hint for multiple returns

user_16406211 0
Viewed 1802

I want to specify my function with correct type hints for return values. My function receives data as a dictionary and returns the modification. It also returns a status code as integer to check if the modification was successfull. For example I want to specify something like this:

def reworkData(measurement:dict)->dict,int:
   ...
   return measurement,0

This currently results in invalid syntax. How can I do this?

type-hinting python
2 Answers

From Python 3.5 to 3.8 you want Tuple[dict, int] in order to specify that you will return both as Python will return them as a tuple.

from typing import Tuple

def rework_data(measurement: dict) -> Tuple[dict, int]:
   ...
   return measurement, 0

As of Python 3.9 Tuple is deprecated and you should use the builtin type

def rework_data(measurement: dict) -> tuple[dict, int]:
   ...
   return measurement, 0
user_32285910

If you have multiple returns the way you do, you're returning a tuple of values (measurement,0). So, you should specify the return as such:

def reworkData(measurement:dict)->(dict,int):
   ...
   return measurement,0

Note:

In some environments, as discussed in the comments, this will still throw a SyntaxError (most likely due to style-checkers used).

user_135900890
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