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：
