python3 for循环-range遍历

for循环、range遍历

for循环

range遍历 range（1,10） 注：是1-9，而不包括最后的10。

实例： 九九乘法表：

# -*- coding: UTF-8 -*-
# 乘法表
for i in range(1,10):
    for j in range(1,10):
        print('{}*{}={}'.format(i,j,i*j))

#for 循环实现99乘法表
for i in range (1,10):
    for j in range (1,i+1):
        print("{}*{} = {:<4}".format(i,j,i*j),end = " ")
    print("")

print('第1种'+"-"*96)

for i in range (9,0,-1):
    for j in range (1,i+1):
        print("{}*{} = {:<4}".format(i, j, i * j), end=" ")
    print("")

print('第2种'+"-"*96)

for i in range (1,10):
    for k in range (1,i):
        print(end = "           ")
    for j in range (i,10):
            print("{}*{} = {:<4}".format(i,j,i*j),end = " ")
    print("")

print('第3种'+"-"*96)

for i in range (9,0,-1):
    for k in range (1,i):
        print(end = "           ")
    for j in range (i,10):
            print("{}*{} = {:<4}".format(i,j,i*j),end = " ")
    print("")

print('第4种'+"-"*96)

for i in range (1,10):
    for j in range (1,10):
        print("%d*%d=%2d" % (i,j,i*j),end = "   ")
    print("")

print('第5种'+"-"*96)

for i in range (1,10):
    for j in range (i,10):
        print("%d*%d=%2d" % (i,j,i*j),end = "   ")
    print("")

print('第6种'+"-"*96)

for i in range (9,0,-1):
    for j in range (1,i+1):
        print("%d*%d=%2d" % (i,j,i*j),end = "   ")
    print("")

print('第7种'+"-"*96)

for i in range (1,10):
    for k in range (1,i):
        print(end = "         ")
    for j in range (i,10):
        print("%d*%d=%2d" % (i, j, i * j), end="   ")
    print("")

print('第8种'+"-"*96)

for i in range (1,10):
    for k in range (1,10-i):
        print(end = "         ")
    for j in range (i,0,-1):
        print("%d*%d=%2d" % (i, j, i * j), end="   ")
    print("")
print('第9种'+"-"*96)