组合数据类型综合练习：英文词频统计

分别定义字符串

>>> s='homework'
>>> for i in s:
    print(i)

列表

>>> classmates=['Candy','Michael','Bob','Amy','[1,2,3]']
>>> for i in classmates:
    print(i)

元组

>>> tup=tuple('Candy')
>>> for i in tup:
    print(i)

字典

>>> names=['Candy','Michael','Amy']
>>> scores = [90, 89, 95]
>>> d = dict(zip(names,scores))
>>> for n,s in d.items():
    print(n,s)

集合

>>> st = set([9,7,'C','a',5,'n'])
>>> for i in st:
    print(i)