"""
filter：筛选
map：映射
"""
lst = ['aa', 'ab', 'cc', 'ee', 'ar']
res = filter(lambda x: x.startswith('a'), lst)
print(list(res)) # ['aa', 'ab', 'ar']
lst = [1, 2, 3, 4, 5, 6]
# res = [item * item for item in lst]
res = map(lambda x: x * x, lst)
print(list(res)) # [1, 4, 9, 16, 25, 36]
