examples/pitfalls/random.py
import random

print(random.random())
$ python examples/pitfalls/random.py

Traceback (most recent call last):
  File "examples/pitfalls/random.py", line 1, in 
    import random
  File ".../examples/pitfalls/random.py", line 3, in 
    print(random.random())
TypeError: 'module' object is not callable