Python打印九九乘法表的五种方式

关键点：外循环控制行，内循环控制列，列数取决于行数（第一行一列，第二行二列……）

方式一：for循环

for i in range(1, 10):
    for j in range(1, 10):
        if i >= j:
            print("{}*{}={}".format(j, i, j * i), end='\t')
    print()

方式二：for循环

for i in range(1, 10):
    for j in range(1, i + 1):
        # print("{}*{}={}".format(i, j, i*j), end='\t')
        print("{0}*{1}={2}".format(j, i, j * i), end='\t')
    print()

方式三：while循环

row = 1
while row <= 9:
    column = 1
    while column <= row:
        print('{}*{}={}'.format(column, row, row * column), end='\t')
        column += 1
    print()
    row += 1

方式四：列表表达式

L = '\n'.join(
    ['\t'.join(['{}*{}={}'.format(column, row, row * column) for column in range(1, row + 1)]) for row in range(1, 10)])
print(L)

方式五：递归算法

def multi(i):
    if i <= 9:
        for j in range(1, i + 1):
            print("{}*{}={}".format(j, i, j * i), end="\t")
        print()
        multi(i + 1)


multi(1)

放在一块

#!/usr/bin/env python
# -*- encoding:utf-8 -*-
# author:ttt

# 方式一：for循环
for i in range(1, 10):
    for j in range(1, 10):
        if i >= j:
            print("{}*{}={}".format(j, i, j * i), end='\t')
    print()

print("分割线".center(100, '-'))
# 方式二: for循环
for i in range(1, 10):
    for j in range(1, i + 1):
        # print("{}*{}={}".format(i, j, i*j), end='\t')
        print("{0}*{1}={2}".format(j, i, j * i), end='\t')
    print()

print("分隔线".center(100, '-'))
# 方式三：while循环
row = 1
while row <= 9:
    column = 1
    while column <= row:
        print('{}*{}={}'.format(column, row, row * column), end='\t')
        column += 1
    print()
    row += 1

print("分隔线".center(100, '-'))
# 方式四：列表表达式
L = '\n'.join(
    ['\t'.join(['{}*{}={}'.format(column, row, row * column) for column in range(1, row + 1)]) for row in range(1, 10)])
print(L)

print("分隔线-".center(100, '-'))


# 方式五：递归算法
def multi(i):
    if i <= 9:
        for j in range(1, i + 1):
            print("{}*{}={}".format(j, i, j * i), end="\t")
        print()
        multi(i + 1)


multi(1)

实现效果：