循环

打印*组成的矩形

m_long = int(input('Please input long:'))
m_wide = int(input('Please input wide:'))
for row in range(m_long):
    for list in range(m_wide):
            print('*',end=' ')
    print()

打印*组成的矩形，只有边框

m_long = int(input('Please input long:'))
m_wide = int(input('Please input wide:'))
for row in range(m_long):
    for list in range(m_wide):
        if (row == 0 or row == m_long-1) or (list == 0 or list == m_wide-1):
            print('*',end=' ')
        #else:
            print(' ',end=' ')
    print()

打印直角三角形

m_long = int(input('Please input long:'))
m_wide = int(input('Please input wide:'))
for row in range(m_long):
    for list in range(row+1):
        print('*',end=' ')
    print()

打印九九乘法口诀表

m_long = int(input('Please input long:'))
m_wide = int(input('Please input wide:'))
for row in range(1,m_long):
    for list in range(1,row+1):
        print('{0}X{1}={2}'.format(row,list,row*list),end=' ')
    print()