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  • python——for循环的应用

    for循环:
    1,基础训练 方法一 例1
    for i in (1,2,3,4,5,6,7,8,9,0): print('lpc') print(i) 元素列表: (1,2,3,4,5,6,7,8,9,0): for循环会对应匹配列表里每一个值,直到讲所有值循环完成结束 方法二 例1 for i in range(12,16): print(i) 结果就是12 13 14 15 例2 for i in range(0,10,2): print(i) 0-10,每次间隔2 例3 for a in range(10): for b in range(10): print('axiba',end='') print()
    2.加强训练
    用for循环做三角形 一
    for a in range(1,6): for b in range(i,6): print('# ',end='') print() # # # # # # # # # # # # # # # for a in range(0,6): for b in range(0,a): print(' ',end=' ') for b in range(a,6): print('# ',end='') print() # # # # # # # # # # # # # # # # # # # # # for a in range(1,6): for b in range(6,i+1): print('# ',end='') print() # # # # # # # # # # # # # # # # # # # # for a in range(1,8): for b in range(1,a+1): print('* ',end='') for b in range(a,8): print('# ',end='') print() * # # # # # # # * * # # # # # # * * * # # # # # * * * * # # # # * * * * * # # # * * * * * * # # * * * * * * * # for i in range(1,10): for j in range(1,11-i): print(' ',end=' ') for j in range(1,i): print('@ ',end=' ') print() for i in range(1,10): for j in range(1,i): print(' ',end=' ') for j in range(1,11-i): print('@ ',end=' ') print() @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 六 for a in range(1,8): for b in range(1,a+1): print('# ',end='') print() # # # # # # # # # # # # # # # # # # # # # # # # # # # # for a in range(1,8): for b in range(a,8): print(' ',end=' ') for c in range(1,a): print('# ',end='') print() # # # # # # # # # # # # # # # # # # # # #
    3.加强训练
    用for循环做乘法口决表
    方法一:
    for i in range(1,10):
        for j in range(1,i+1):
            print(str(i)+"*"+ str(j)+"="+str(i*j),end=" ")
        print()
    
    方法二:
    
    for i in range(1,10):
        for j in range(1,i+1):
            print("%d*%1d=%2d" % (j,i,i*j) ,end=' ')
        print()

    结果:
    
    
    1*1=1 
    2*1=2 2*2=4 
    3*1=3 3*2=6 3*3=9 
    4*1=4 4*2=8 4*3=12 4*4=16 
    5*1=5 5*2=10 5*3=15 5*4=20 5*5=25 
    6*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36 
    7*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49 
    8*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64 
    9*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81 
     
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  • 原文地址:https://www.cnblogs.com/Leonardo-li/p/8652097.html
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