Creación e importación de módulos

import sys
print(sys.path[:3])

import math
print(math.sqrt(16))
print(math.pi)

from math import sqrt, pi
print(sqrt(25))
print(pi)

import os.path as osp
print(osp.join('a', 'b', 'c'))

# Avoid:
# from math import *
# Use explicit imports instead
print('namespace tip')

# In your script:
# if __name__ == '__main__':
#     main()
print(__name__)

import importlib, math
importlib.reload(math)
print('reloaded')

import math
print(dir(math)[:5])

import sys
sys.path.insert(0, '/tmp')
print(sys.path[:3])

# In mymodule.py:
# __all__ = ['public_func']
# def public_func(): ...
# def _private(): ...
print('__all__ demo')