嵌套循环如何操作呀？

Question

这两道题如何编写呀!看不太懂嵌套循环怎么编写，晕๑_๑。求拯救。

Answer 1

# 第一题
def print_rectangle(height,width):
    for i in range(height):
        for j in range(width):
            print("*",end="")
        print('\n',end="")


print_rectangle(2,4)

# 第二题
def printTriangle(line):
    for i in range(1,line+1):
        for j in range(i):
            print('*',end ='')
        print('\n',end='')

printTriangle(5)

#第三题
num = 1
for i in range(3):
    for j in range(3):
        print(num, end=" ")
        num += 1
    print()

# 第四题
for i in range(9, 0, -1):
    for j in range(9, 0, -1):
        if j >= i:
            print(f"{j} x {i} = {j*i}", end="\t")
    print()