python进阶代码练习

# *arg  **kwargs
def greet(farg, *arg):
    print ('title: ', farg)
    for i in arg:
        print('parm ', i)
greet('hello', 'x', 'y', 'z')


def greet_me(**kwargs):
    for key, value in kwargs.items():
        print('his ',key, ' is', value)

greet_me(age='18', name='hd')

# 生成器
def generator_fun(n=10):
    for i in range(n):
        yield i 

for i in generator_fun(3):
    print(i)

def fib(n):
    a = 1
    b = 1
    for i in range(n):
        yield a 
        a, b = b, a+b

for i in fib(5):
    print(i)

from collections import defaultdict
from collections import Counter

colours = (('A','yellow'),('B','yellow'),('A','blue'))
result =  defaultdict(list)
for name, colour in colours:
    result[name].append(colour)
print(result)
print(result['A'])


result_count = Counter(name for name, colour in colours)
print(result_count)



from collections import deque  #双端队列

d = deque(range(5))
print(d)
print(d.popleft())
print(d.pop())