python 打印九九乘法表

输入9，开始打印；0：退出

key_msg = input("please key in Number(0:exit):")，调用乘法表函数
键盘输入的是字符型数据
字符串比较与数字比较是否相等注意区分

# This is a sample Python script.

# Press Shift+F10 to execute it or replace it with your code.
# Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings.
import time


# ctrl+shift+enter ,添加功能注释
def print_hi(name):
    # Use a breakpoint in the code line below to debug your script.
    print(f'Hi, {name}')  # Press Ctrl+F8 to toggle the breakpoint.


def by2by(num):
    """

    :param num:
    """
    for aa in range(num):
        print(aa)
    while True:
        if num == 0:
            break
        else:
            print(num)
            num -= 1


def by2by2(num):
    """

    :param num:
    """
    try:
        num2 = int(num)
        for bb in range(1, num2 + 1):

            yy2 = bb
            for bb2 in range(1, bb + 1):
                result2 = yy2 * bb2
                print(str(bb2) + "*" + str(yy2) + "=" + str(result2) + " ", end="")  # end表示不换行

            print()
    except:
        print("输入错误,请输入数字")


def by_key_in_to_calc(num):
    """
      计算平方根
    :param num:输入数字2
    """

    try:
        aa = int(num)  # 输入字符转换成整型
        print(num + "'s square is:" + str(aa * aa))
    except:
        print("输入错误,请输入数字")


# Press the green button in the gutter to run the script.
if __name__ == '__main__':
    print_hi('good day')
    # by2by(5)
    # by2by2(9)

    key_msg = input("please key in Number(0:exit):")
    a = 1
    while True:
        a = a + 1
        #  time.sleep(5)
        if key_msg == '0':  # 字符串比较相等，键盘输入
            print("0:已退出0exit")
            break
        else:
            print("your keyin is: " + key_msg)
            by_key_in_to_calc(key_msg)
            by2by2(key_msg)
            key_msg = input("please key in Number(0:exit):")

# See PyCharm help at https://www.jetbrains.com/help/pycharm/