我如何限制用户只让他输入大于 minimum_range 的数字？

Question

import random


def input_range():
    minimum_range = 5
    users_range = input("set the maximum value for the range, minimum " + minimum_range + ":")
    if int(users_range) > int(minimum_range):
        print("The maximum range you selected is:", users_range)
    else:
        print("Out of range, try again")

    random_number = random.randint(int(minimum_range), int(users_range))
    print(random_number)


def name_user_request():
    users_name = input("what's yor name? ")
    print("Hi " + users_name + " nice to meet you")


input_range()
name_user_request()

如果我输入的数字小于 minimum_range（在本例中为 5），我发布的这段代码会出现错误，任何帮助都将非常有用。谢谢！

Answer 1

您可以使用 while 循环一遍又一遍地请求有效输入（我将其他行更改为使用 f-strings）：

import random

def input_range():
    minimum_range = 5
    prompt = f"Set the maximum value for the range, minimum {minimum_range}: "

    while (users_range := int(input(prompt))) < minimum_range:
        print("Out of range, try again")
    print(f"The maximum range you selected is: {users_range}")

    random_number = random.randint(minimum_range, users_range)
    print(random_number)

def name_user_request():
    users_name = input("what's yor name? ")
    print(f"Hi {users_name}, nice to meet you!")

input_range()
name_user_request()

请注意，它使用“海象”运算符 :=（在 python 3.8 中引入）。如果没有海象运算符，您可以将 while 部分替换为

users_range = int(input(prompt))
while users_range < minimum_range:
    print("Out of range, try again")
    users_range = int(input(prompt))

Answer 2

尝试递归!!

import random

def input_range():
    minimum_range = 5
    users_range = input("set the maximum value for the range, minimum " + str(minimum_range) + ":")
    if int(users_range) > int(minimum_range):
        print("The maximum range you selected is:", users_range)
        random_number = random.randint(int(minimum_range), int(users_range))
        print(random_number)
        return        
    else:
        print("Out of range, try again")
        input_range()
    return    



def name_user_request():
    users_name = input("what's yor name? ")
    print("Hi " + users_name + " nice to meet you")

input_range()
name_user_request()

我如何限制用户只让他输入大于 minimum_range 的数字？

how can i limit the user by letting him input a number only if higher than minimum_range?

python

input

range

valueerror