练习题（元组、列表、字符串）讲解总结

Myth丶恋晨 2022-03-31 08:26 330阅读 0赞

\#1.元组元素求和b=(1,2,3,4,5,6,7,8,9)

# b = (1, 2, 3, 4, 5, 6, 7, 8, 9)
    # total = 0
    # for i in b:
    #     # print(i)
    #     total += i
    #
    # print(total)

2.输出元组内7的倍数及个位为7的数

b = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
    for i in b:
        if i % 7 == 0 or i % 10 == 7:
            print(i)

3.列表倒数  
a=\[123,4567,12,3456\]  
输出 a = \[321, 7654, 21, 6543\]

第一种方法：
    a = [123, 4567, 12, 3456]
    for i in a:
        temp = 0
        while i > 0:
            # 第一次 0 +3 == 3  第二次 30+2 = 32  第三次 320+1 =321
            temp = temp * 10 + i % 10
            i = i // 10  # 12  1  0
    
        print(temp)
    # 第二种方式：
    a = [123, 4567, 12, 3456]
    b = []
    for i in a:
        i = str(i)  # 将int值转换成字符串类型的值
        # print(type(i))
        # print(i)
        i = i[::-1]
        print(i)
        i = int(i)
        print(type(i))
        b.append(i)
    
    print(b)

1.‘2018-11-12’去掉‘-’输出

# s = '2018-11-12'
    # s2 = s.replace('-', '')
    # print(s2)

\#2.统计字符串a中 1的个数 a=‘201811’

# a = '201811'
    # ret = a.count('1')
    # print(ret)

3.字符串换行输出a = '12345678901234567890’效果如下:

# 1234
    # 5678
    # 9012
    # 3456
    # 7890
    # a = '12345678901234567890'
    # b = 0
    # for i in a:
    #     print(i, end='')
    #     b += 1
    #     if b % 4 == 0:
    #         print()
    
    # for index, value in enumerate(a, start=1):
    #     # print(index, value)
    #     print(value, end='')
    #     if index % 4 == 0:
    #         print()

\#4.字符串换行输出 a = ‘12345678901234567890’，效果如下:

# 1
    # 23
    # 456
    # 7890
    # 12345
    # 67890
    
    # a = '12345678901234567890'
    #
    # line = 1
    # temp = 1
    # for i in a:
    #     print(i, end='')
    #     if line == temp: # 2==1
    #         line += 1 # 2 3
    #         temp = 0 # 0 0
    #         print() # 换行
    #     temp += 1 # 1 2
    
    # a = '12345678901234567890'
    # x = 0
    # y = 1
    # c = 0
    # while x <= len(a):
    #     b = a[x:y]  # a[0:1]->1     b= a[1:3] -->2,3 b=[3:6]
    #     x = y  # x=1    x=3
    #     y += 2 + c  # y= y+2+c->3 # y =6
    #     c += 1  # c=c+1 -->1 #  c=2
    #     print(b)

5.统计数字，字母，下划线个数

# a = '1234abcABCDE_'
    #
    # num = 0  # 记录数字的个数
    # char = 0  # 记录字符的个数
    # xhx = 0  # 记录下划线的个数
    
    # for i in a:
    #     if i >= '0' and i <= '9':
    #         '''判断是否是数字'''
    #         num += 1
    #     elif (i >= 'A' and i <= 'Z') or (i >= 'a' and i <= 'z'):
    #         '''判断是否是字母'''
    #         char += 1
    #     else:
    #         '''判断是否是下划线'''
    #         xhx += 1
    #
    # print(num, char, xhx)
    
    # 第二种方式：
    # a = '1234abcABCDE_'
    # num = 0  # 记录数字的个数
    # char = 0  # 记录字符的个数
    # xhx = 0  # 记录下划线的个数
    # for i in a:
    #     if i.isdigit():
    #         '''判断是否是数字'''
    #         num += 1
    #     elif i.isalpha():
    #         '''判断是否是字母'''
    #         char += 1
    #     else:
    #         '''判断是否是下划线'''
    #         xhx += 1
    #
    # print(num, char, xhx)