Difference between $PATH, sys.path and os.environ

Question

What is the difference between $PATH variable, sys.path and os.environ? I understand that they both serve as paths where python searches packages. But it\'d be nice to have

Answer 1

sys.path

Is a list of strings that specifies the search path for modules. Initialized from the environment variable PYTHONPATH, plus an installation-dependent default.

os.environ

Is a mapping object representing the string environment. For example, environ['HOME'] is the pathname of your home directory (on some platforms), and is equivalent to getenv("HOME") in C.

Environment variable PATH

Specifies a set of directories where executable programs are located. In general, each executing process or user session has its own PATH setting.