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Python基础之循环语句(for语句、break与continue的使用)

发布时间:『 2019-06-24 23:21』  博客类别:Python  阅读(456)

for循环的使用实现99乘法表

 

For循环语法:

For i in range(start,end,step)

Print(i)

# for循环语句
# 输出1到9
for i in range(1,10):
    print(i)

# 输出0到9
for i in range(10):
    print(i)

print("------------------------------")
# 输出1到1,3,5,7,9
for i in range(1,10,2):
    print(i)

print("------------------------------")
# 输出1到0,2,4,6,8
for i in range(0,10,2):
    print(i)

print("------------------------------")
# 倒序打印输出9,7,5,3,1
for i in range(9,0,-2):
    print(i)


需求:使用for循环打印99乘法表,然后反转乘法表

# 使用for循环打印99乘法表
for i in range(1,10):
    for j in range(1,i+1):
        print("%d * %d = %d" % (j, i, j * i),end="\t")
    print()

print("------------------------------")
# 反转乘法表
for i in range(1,10).__reversed__():
    for j in range(1,i+1):
        print("%d * %d = %d" % (j, i, j * i),end="\t")
    print()

print("------------------------------")
for i in range(9,0,-1):
    for j in range(1,i+1):
        print("%d * %d = %d" % (j, i, j * i),end="\t")
    print()


breakcontinue的使用

Break:中断当前所在整个循环

Continue:中断当前循环,继续下一次循环

# Break:中断当前所在整个循环
# 输出0,1,2
for i in range(6):
    if(i==3):
        break
    print(i)

print("----------------")
# Continue:中断当前循环,继续下一次循环
# 输出0,1,2,4,5
for i in range(6):
    if(i==3):
        continue
    print(i)


使用嵌套循环打印菱形操作

 

需求:打印菱形


#半个打印菱形
line = 6
for i in range(0,line):
    # 打印每一行中的" "
    for k in range(line-i):
        print(" ",end="")
    # 打印每一行中的"*"
    for j in range(2*i+1):
        print("*",end="")
    print()

# print("---------------------------------")
line = 5
for i in range(0,line).__reversed__():
    # 打印每一行中的" "
    for k in range(line-i+1):
        print(" ",end="")
    # 打印每一行中的"*"
    for j in range(2*i+1):
        print("*",end="")
    print()

# line = 5
# for i in range(0,line):
#     # 打印每一行中的" "
#     for k in range(i+2):
#         print(" ",end="")
#     # 打印每一行中的"*"
#     for j in range(2*(line-i)-1):
#         print("*",end="")
#     print()



over......


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