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Type Checking and mypy Cheat Sheet by

MyPy Tool

mypy [files]
Command line to check syntax
 
-v
Be Verbose
 
-any-e­xpr­s-r­eport PATH
Provide a path to generate a 
coverage
report
This tool will show you Type Errors found in the code. If 
verbose
is off and the command returns nothing, the code is OK.

Type Definition

from typing import Dict, List, Tuple
Import types definition
 
var: str = "­"
Define 
str
a variable
 
var: Dict[str, int] = {}
Define 
Dict
a variable
 
var: Tuple[str, float, int] = ()
Define 
Tuple
a variable
 
MyType = Dict[str, int]
Define a custom 'Type`
 
var: MyType = {}
Define 
MyType
a variable
 
def functi­on(arg: str) -> int:
Define a function that takes an 
str
and returns an 
int
 
var: Any
The 
Any
type accepts all types
 
var: Union[str, int]
This 
Union
type accepts either a 
str
or an 
int
 
pip install mypy

pip install typing
           
 

Metadata

  • Languages:
  • Published: 20th July, 2017
  • Rated: 4 out of 5 stars based on 1 ratings

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