1. Python modules in the standard library. These modules are used for tasks such as representing data, string and text processing, interacting with the operating system and filesystem, and web programming.

Numeric Types — int, float , complex.

Iterator Types.

Sequence Types — list, tuple , range.

Text Sequence Type — str.

Boolean Operators – and, or, not

2. An external module is written as a separate source file that contains at least one import or export declaration. 

Pyright — Static type checker.

requests-async — support for async / await syntax for requests.

HTTPie — Modern command line cURL.

pipenv — Better packaging for Python.

mypy — Static type checker.