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  • Python条件控制与循环

    条件控制语句:if

    循环语句:while、for

    其他语句:continue、break、pass

    1、if语句

    # ================================
    a = 1
    if a < 2:
        print('true')
    else:
        print('false')
    # ================================
    if a:
        print('true')
    else:
        print('false')
    # ================================
    if a == 0:
        print('a = 0')
    elif a == 1:
        print('a = 1')
    elif a == 2:
        print('a = 2')
    else:
        print('a为其他值')

    2、while语句

    # ===================================
    a = 1
    sum = 0
    while a <= 100:
        sum += sum
        a += 1
    print('1到100的和为:', sum)
    # ===================================
    a = 0
    while a < 5:
        print('a小于5')
        a += 1
    else:
        print('a大于等于5')
    # ===================================
    a = 0
    while a < 5:
        a += 1
        if a == 2:
            continue
        if a == 4:
            break
        print(a, end=' ')

    3、for语句

    # ==================================
    lst = ['aaa', 'bbb', 'ccc', 'ddd']
    for s in lst:
        print(s, end=' ')
    print()
    # ==================================
    lst = ['aaa', 'bbb', 'ccc', 'ddd']
    for s in lst:
        if s == 'aaa':
            continue
        if s == 'ccc':
            break
        print(s, end=' ')
    else:
        print('finish')
    print()

    4、pass语句

    a = 0
    if a == 0:
        pass
    elif a == 1:
        pass
    elif a == 2:
        pass
    else:
        pass
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  • 原文地址:https://www.cnblogs.com/wbz-blogs/p/12081559.html
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