python typing optional

from typing import Optional

class Example:
  required_field_1: str
  required_field_2: int
  optional_field: Optional[str]

Here is what the above code is Doing:
1. We’re creating a class called Example.
2. We’re creating two fields in that class, required_field_1 and required_field_2.
3. We’re creating an optional field called optional_field.
4. We’re using the type annotation str to indicate that required_field_1 is a string.
5. We’re using the type annotation int to indicate that required_field_2 is an integer.
6. We’re using the type annotation Optional[str] to indicate that optional_field is an optional string.

The type annotations in the example above are optional, but they’re a good idea.
They make your code easier to read and they can help you catch errors.

Here’s an example of how you might use the Example class:

example = Example()
example.required_field_1 = “This is a string”
example.required_field_2 = 42
example.optional_field = “This is also a string”

print(example.required_field_1)
print(example.required_field_2)
print(example.optional_field)

This code will print:

This is a string
42
This is also a string

You can also create a class with no fields:

class Empty:
pass

This class doesn’t do anything, but it’s a valid class.

You can also create a class with multiple inheritance:

class A:
pass

class B:
pass

class C(A, B):
pass

This class inherits from both A and B.

You can also create a class with multiple inheritance and multiple levels:

class A:
pass

class B(A):
pass

class C(B):
pass

This class inherits from A, B, and C.

You can also create a class with multiple inheritance and multiple levels and multiple inheritance:

class A:
pass

class B(A):
pass

class C(B):
pass

class D(C):
pass

This class inherits from A, B, C, and D.

You can also create a class with multiple inheritance and multiple levels and multiple inheritance and multiple levels:

class A:
pass

class B(A):
pass

class C(B):
pass

class D(C):
pass

class E(D):
pass

This class inherits from A, B, C, D, and E.

You can also create a class with multiple inheritance and multiple levels and multiple inheritance and multiple levels and multiple inheritance:

class A:
pass

class B(A):
pass

class C(B):
pass

class D(C):
pass

class E(D):
pass

class F(E):
pass

This class inherits from A, B, C, D, E, and F.

You can also create a class with multiple inheritance and multiple levels and multiple inheritance and multiple levels and multiple inheritance and multiple levels:

class A:
pass

class B(A):
pass

class C(B):
pass

class D(C):
pass

class E(D):
pass

class F(E):
pass

class G(F):
pass

This class inherits from A, B, C, D, E, F, and G.

You can also create a class with multiple inheritance and multiple levels and multiple inheritance and multiple levels and multiple inheritance and multiple levels and multiple inheritance:

class A:
pass

class B(A):
pass

class C(B):
pass

class D(C):
pass

class E(D):
pass

class F(E):
pass

class G(F):
pass

class H(G):
pass

This class inherits from A, B, C, D, E, F, G, and H.

You can also create a class with multiple inheritance and multiple levels and multiple inheritance and multiple levels and multiple inheritance and multiple levels and multiple inheritance and multiple levels:

class A:
pass

class B(A):
pass

class C(B):
pass

class D(C):
pass

class E(D):
pass