def print_nums(num):

    for i in range(num):

        print(i)

print_nums(3)

def add(n1, n2):

    print("{} + {} = ?".format(n1, n2))

    print(n1 + n2)

add(3, 5)

def add2(n1, n2, n3):

    print("{} + {} + {} = ?".format(n1, n2, n3))

    print(n1 + n2 + n3)

add2(3, 5, 9)

def add3(n1, n2):

    return n1 + n2

sum = add3(3, 5)

print("sum = {}".format(sum))

def multi_table(num):

    i = 1

    while i <= num:

        text = ""

        # for j in range(1, i+1):

        j = 1

        while j <= i:

            text += "{}*{}={:2}  ".format(i, j, i*j)

            j += 1

        print(text)

        i += 1

def print_shape(row, col):

    for i in range(row):

        line = ""

        for j in range(col):

            line += "*"

        print(line)

def choice_box():

    import easygui as g

    msg = "输入你喜欢的颜色"

    title = "游戏互动"

    choices = ["红色", "绿色", "蓝色", "青色"]

    return g.choicebox(msg, title, choices)