Basic Operation

List

python2: zip() python3: list(zip())

Set

a = set([2,3,4]).union([1,2,3])

Dict

b = {}.get(1, None) elegantly initialize dict a={}.fromkeys([1,2,3],0)

enumerate

1 in {1:2} is faster than 1 in {1:2}.keys()

Map key to multiple values

http://python3-cookbook.readthedocs.io/zh_CN/latest/c01/p06_map_keys_to_multiple_values_in_dict.html

Deque

q = collections.deque()
course = q.popleft()
q.append(i)

Generator

Generators

• Generator Pattern is to make iterator
• Python make Generator more simplified by using yield