python练习题

1、统计字母、数字、空格以及其它的个数

def check(list):
    alpha = 0
    num = 0
    space = 0
    ether = 0
    for i in list:
        if i.isalpha():
            alpha += 1
        elif i.isdigit():
            num += 1
        elif i.isspace():
            space += 1
        else:
            ether += 1
    s = "alpha有{}个 num{}个 spe{}个 e有{}个".format(alpha, num, space, ether)
    return s

2、判断用户传入的对象（字符串、列表、元组）的长度是否大于5

str1 = "dfsdfdsfsd"
str2 = [1,2,3,4,5,6]
str3 = (1,2,3)
def check_len(str):
    if len(str) > 5:
        return True
    else:
        return False

3、检查传入列表的长度，大于2，保留前2个长度的内容，并将新内容返回

def check_space(s):
    if len(s):
        return s[:2]
print(check_space(str3))

 4、检查传入字典的每一个value的长度，如果大于2，保留前两个的长度的内容，并将新内容返回

dic = {"k1":"v1v1","k2":[11,22,33,44]}
def item(conn):
    for key,value  in conn.items():
        if len(value) > 2:
            dic[key]= value[:2]
    return conn