开发步骤:

step1、单题开发,以两个数加法为例,加数取值范围[[0,101],要实现哪些功能,怎么实现?
引入随机函数库→import random
随机产生加数→ random.randintO) random.randranae0出题,题目打印→printO注意占位函数formatO或占位符%的使用做题,提供键盘输入接口 →input0
·自动批阅→i条件语句使用
step2、增加模式选择,实现加减法,怎么实现,要注意哪些?
随机产生“+'或’模式→random.choice0)
·考虑减法模式下,不能出现被减数小于减数的情况→Python中的两数交换
考虑判题与原有题目的结构,建议将判题模块单列,只考虑输入的答案与实际的答案是否一致
step3、多题目模式,对题目数量有要求模式;对正确数量有要求模式;怎么实现?.多题量出题,考虑出题量为关注点的模式→for循环,其中循环次数应由用户从键盘输入.除了判断每一道题目的对错外,考虑统计做对的题目数
多题量出题,考虑做题正确率为关注点的模式→while循环,其中用做对的数量来进行条件的限制
step4、增加对用户误操作的判断
考虑小朋友在输入过程中,不小心误触碰键盘,导致输入的值为非数字型字符→s.isdigit0)
.允许在初次误输入时,有第二次输入答案的机会
.考虑小朋友连续多次输入非数字型字符,可能是不想再进行练习,则应该中断本次练习,具体多少次
判断为不想做练习了,可以由用户输入决定,或者直接在代码中进行固定值设置。
中断→break

整体python代码框架:

import random

# 单题加法
def single_addition():
    # 实现加法逻辑
    pass

# 加法或减法
def addition_or_subtraction():
    # 实现加法或减法逻辑
    pass

# 多题模式
def multiple_questions(total_questions):
    # 实现多题模式逻辑
    pass

# 安全输入
def safe_input(prompt):
    # 实现安全输入逻辑
    pass

# 主程序
def main():
    print("Welcome to the Arithmetic Practice System!")
    total_questions = safe_input("Enter the number of questions you want to solve: ")
    if total_questions is not None:
        multiple_questions(total_questions)

if __name__ == "__main__":
    main()

分步骤开发一个适用于小学生的口算练习系统。下面是每个步骤的实现方法:

Step 1: 单题加法练习

  1. 功能实现:
  • 使用 random 库随机生成两个加数。
  • 打印出题并使用 input() 收集用户的答案。
  • 使用条件语句比较用户答案和正确答案。
  1. 代码示例:
import random

def single_addition():
    num1 = random.randint(0, 101)
    num2 = random.randint(0, 101)
    correct_answer = num1 + num2

    user_answer = int(input(f"What is {num1} + {num2}? "))
    if user_answer == correct_answer:
        print("Correct!")
    else:
        print(f"Wrong. The correct answer is {correct_answer}")

Step 2: 增加模式选择

  1. 功能实现:
  • 除了加法,引入减法。
  • 使用 random.choice() 随机选择加法或减法。
  • 确保减法中被减数不小于减数。
  1. 代码示例:
def addition_or_subtraction():
    num1 = random.randint(0, 101)
    num2 = random.randint(0, 101)
    operation = random.choice(["+", "-"])

    if operation == "-" and num1 < num2:
        num1, num2 = num2, num1  # 确保不出现负数结果

    correct_answer = eval(f"{num1} {operation} {num2}")
    user_answer = int(input(f"What is {num1} {operation} {num2}? "))
    if user_answer == correct_answer:
        print("Correct!")
    else:
        print(f"Wrong. The correct answer is {correct_answer}")

Step 3: 多题目模式

  1. 功能实现:
  • 实现一个循环,让用户可以连续解决多个题目。
  • 根据用户输入的题目数量进行出题。
  • 统计用户正确回答的数量。
  1. 代码示例:
def multiple_questions():
    total_questions = int(input("How many questions would you like to solve? "))
    correct_answers = 0

    for _ in range(total_questions):
        if addition_or_subtraction():  # 使用之前定义的函数
            correct_answers += 1
    
    print(f"You answered {correct_answers} out of {total_questions} questions correctly.")

Step 4: 处理用户误操作

  1. 功能实现:
  • 检查用户输入是否为数字。
  • 若输入错误,提供再次输入的机会。
  • 考虑连续多次错误输入的情况,并设置中断条件。
  1. 代码示例:
def safe_input(prompt):
    attempts = 0
    while attempts < 3:  # 允许最多三次尝试
        user_input = input(prompt)
        if user_input.isdigit():
            return int(user_input)
        else:
            print("Please enter a valid number.")
            attempts += 1
    print("Too many invalid attempts. Exiting.")
    return None  # 或者使用 break 中断循环

 完整代码:

import random

def single_addition():
    # 随机生成两个数字
    num1 = random.randint(0, 101)
    num2 = random.randint(0, 101)

    # 显示加法题目
    print(f"What is {num1} + {num2}? ")

    # 获取用户答案
    user_answer = int(input())

    # 比较用户答案与正确答案
    correct_answer = num1 + num2
    if user_answer == correct_answer:
        print("Correct!")
    else:
        print(f"Wrong. The correct answer is {correct_answer}.")


def addition_or_subtraction():
    # 随机生成两个数字
    num1 = random.randint(0, 101)
    num2 = random.randint(0, 101)

    # 随机选择加法或减法
    operation = random.choice(["+", "-"])

    # 确保在减法情况下,第一个数字不小于第二个数字
    if operation == "-" and num1 < num2:
        num1, num2 = num2, num1

    # 显示题目
    print(f"What is {num1} {operation} {num2}? ")

    # 获取用户答案
    user_answer = int(input())

    # 计算正确答案
    if operation == "+":
        correct_answer = num1 + num2
    else:
        correct_answer = num1 - num2

    # 比较用户答案与正确答案
    if user_answer == correct_answer:
        print("Correct!")
    else:
        print(f"Wrong. The correct answer is {correct_answer}.")
# 多题模式
def addition_or_subtraction():
    num1 = random.randint(0, 101)
    num2 = random.randint(0, 101)
    operation = random.choice(["+", "-"])

    if operation == "-" and num1 < num2:
        num1, num2 = num2, num1

    print(f"What is {num1} {operation} {num2}? ")
    user_answer = int(input())

    if operation == "+":
        correct_answer = num1 + num2
    else:
        correct_answer = num1 - num2

    return user_answer == correct_answer

# 多题模式函数
def multiple_questions(total_questions):
    correct_answers = 0

    for _ in range(total_questions):
        if addition_or_subtraction():
            correct_answers += 1

    print(f"You answered {correct_answers} out of {total_questions} questions correctly.")

# 例子:运行10个题目的练习
multiple_questions(10)
def safe_input(prompt):
    max_attempts = 3  # 设置最大尝试次数
    attempts = 0

    while attempts < max_attempts:
        user_input = input(prompt)

        # 检查输入是否为数字
        if user_input.isdigit():
            return int(user_input)
        else:
            print("Invalid input. Please enter a number.")
            attempts += 1  # 增加尝试次数

    print("Too many invalid attempts. Exiting.")
    return None  # 返回一个错误指示值

# 例子:安全获取用户输入
user_number = safe_input("Enter a number: ")
if user_number is not None:
    print(f"You entered: {user_number}")
else:
    print("No valid input received.")
# 主程序
def main():
    print("Welcome to the Arithmetic Practice System!")
    total_questions = safe_input("Enter the number of questions you want to solve: ")
    if total_questions is not None:
        multiple_questions(total_questions)

# 程序入口
if __name__ == "__main__":
    main()

运行实例:

python 数值在某范围_数据结构