Python编程练习（四）（2）

import random
def random_letter():
    letter = chr(random.randint(ord('a'), ord('z')))
    return letter
def random_num09():
    num = random.randint(0, 9)
    return num
if __name__ == '__main__':
    ls = []
    str_max = int(input('请输入随机字符串长度的最大值：'))
    str_len = random.randint(1, str_max)
    for i in range(str_len):
        flag = random.randint(0, 1)
        if flag == 0:
            ls.append(str(random_num09()))
        else:
            ls.append(random_letter())
    strs = ''.join(ls)
    print(strs)

def num_alpha(str):
    flag_num = 0
    flag_alpha = 0
    for i in str:
        if i.isdigit():
            flag_num = 1
            break
    for i in str:
        if i.isalpha():
            flag_alpha = 1
            break
    if flag_num == 1 and flag_alpha == 1:
        return True
    else:
        return False
if __name__ == '__main__':
    str = input('请输入一个字符串：')
    if num_alpha(str):
        print('该字符串中既有数字又有字母')
    else:
        print('该字符串不满足既有数字又有字母')

def alp_sort(str):
    ls = list(str)
    ls_upper = []
    for i in range(len(str)):
        if ls[i].isalpha:
            if ls[i].isupper():
                ls_upper.append(ls[i])
                ls[i] = ls[i].lower()
    ls.sort()
    for i in ls_upper:
        flag = ls.index(i.lower())
        ls[flag] = ls[flag].upper()
    str = ''.join(ls)
    return str
if __name__ == '__main__':
    str = input('请输入一段字符串：')
    print(f'排序后的字符串：{alp_sort(str)}')

def isHuiWen(str):
    ls_1 = list(str)
    ls_2 = list(str)
    ls_2.reverse()
    if ls_1 == ls_2:
        print('该函数是回文字符串')
    else:
        print('该函数不是回文字符串')
if __name__ == '__main__':
    str = input('请输入一个字符串：')
    isHuiWen(str)

def length(book_name):
    l = len(book_name)
    print("你心中的书名长度是：", l)
length("活着")

def find_all(string, sub):
    start = 0
    pos = []
    while True:
        start = string.find(sub, start)
        if start == -1:
            return pos
        pos.append(start)
        start += len(sub)
print(find_all('今天真的呵呵呵呵呵呵呵呵呵呵', '呵'))

def find_all(string, sub):
    start = 0
    pos = []
    while True:
        start = string.find(sub, start)
        if start == -1:
            return pos
        pos.append(start)
        start += len(sub)
print(find_all('今天真的呵呵欧呵呵欧呵呵欧呵呵欧呵呵', '呵呵'))

a = input('请输入甲同学喜欢的游戏：')
b = input('请输入乙同学喜欢的游戏：')
if a.lower() == b.lower():
    print('你们喜欢相同的游戏')
else:
    print('你们喜欢不同的游戏')

a = input("请输入一句话:")
for i in range(0, len(a)-1):
    if a[i] == "邪":
        if a[i+1] == '恶':
            a = a.replace("邪", "*")
            a = a.replace("恶", "*")
            break
print(a)