python define type code example

Example 1: python typing list of strings

from typing import List

def my_func(l: List[int]):
    pass

Example 2: type python

#This is able to tell the user what the type of an object is
string_example = "string"
int_example = 1
float_example = 1.1
type_of_string = type(string_example)
#<class 'str'>
type_of_int = type(int_example)
#<class 'int'>
type_of_float = type(float_example)
#<class 'float'>

Example 3: typing generator python

# Iterator
def infinite_stream(start: int) -> Iterator[int]:
    while True:
        yield start
        start += 1

# Generator        
def infinite_stream(start: int) -> Generator[int, None, None]:
    while True:
        yield start
        start += 1

Example 4: type declaration python

def greeting(name: str) -> str:
    return 'Hello ' + name

Example 5: type in python

numbers_list = [1, 2]
print(type(numbers_list))

numbers_dict = {1: 'one', 2: 'two'}
print(type(numbers_dict))

class Foo:
    a = 0

foo = Foo()
print(type(foo))

                       Output

<class 'dict'>
<class 'Foo'>
<class '__main__.Foo'>