Python练手小项目

计算器

创建一个简单的计算器，能够进行加、减、乘、除四种基本运算。

# 定义加法函数
def add(x, y):return x + y# 定义减法函数
def subtract(x, y):return x - y# 定义乘法函数
def multiply(x, y):return x * y# 定义除法函数
def divide(x, y):if y == 0:return "Error! Division by zero."  # 防止除以零return x / y# 打印操作选项
print("Select operation:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")# 获取用户选择的操作
choice = input("Enter choice(1/2/3/4): ")# 获取用户输入的两个数字
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))# 根据用户选择的操作调用相应的函数
if choice == '1':print(f"{num1} + {num2} = {add(num1, num2)}")
elif choice == '2':print(f"{num1} - {num2} = {subtract(num1, num2)}")
elif choice == '3':print(f"{num1} * {num2} = {multiply(num1, num2)}")
elif choice == '4':print(f"{num1} / {num2} = {divide(num1, num2)}")
else:print("Invalid input")  # 处理无效输入

猜数字游戏

编写一个猜数字游戏，计算机随机生成一个1到100之间的数字，用户需要猜这个数字，程序会提示猜大了还是猜小了，直到猜对为止。

import random  # 导入随机数模块# 生成一个1到100之间的随机数
number_to_guess = random.randint(1, 100)
attempts = 0  # 初始化尝试次数print("Guess the number between 1 and 100")while True:guess = int(input("Enter your guess: "))  # 获取用户猜测的数字attempts += 1  # 尝试次数加一if guess < number_to_guess:print("Too low!")  # 提示猜的数字太小elif guess > number_to_guess:print("Too high!")  # 提示猜的数字太大else:print(f"Congratulations! You've guessed the number in {attempts} attempts.")  # 猜对了break  # 结束循环

简单的记事本

创建一个简单的记事本应用，用户可以添加、查看和删除笔记。

notes = []  # 初始化一个空列表来存储笔记# 添加笔记的函数
def add_note():note = input("Enter your note: ")notes.append(note)print("Note added!")# 查看所有笔记的函数
def view_notes():print("Your notes:")for i, note in enumerate(notes, 1):print(f"{i}. {note}")# 删除笔记的函数
def delete_note():view_notes()  # 先显示所有笔记note_index = int(input("Enter the note number to delete: ")) - 1if 0 <= note_index < len(notes):del notes[note_index]print("Note deleted!")else:print("Invalid note number")  # 处理无效输入# 主循环
while True:print("\n1. Add Note")print("2. View Notes")print("3. Delete Note")print("4. Exit")choice = input("Enter your choice: ")if choice == '1':add_note()elif choice == '2':view_notes()elif choice == '3':delete_note()elif choice == '4':break  # 退出循环else:print("Invalid choice. Please try again.")  # 处理无效选择

简单的联系人管理系统

创建一个简单的联系人管理系统，可以添加、查看、删除联系人。

contacts = {}  # 初始化一个空字典来存储联系人# 添加联系人的函数
def add_contact():name = input("Enter contact name: ")phone = input("Enter contact phone number: ")contacts[name] = phoneprint("Contact added!")# 查看所有联系人的函数
def view_contacts():print("Your contacts:")for name, phone in contacts.items():print(f"Name: {name}, Phone: {phone}")# 删除联系人的函数
def delete_contact():name = input("Enter the name of the contact to delete: ")if name in contacts:del contacts[name]print("Contact deleted!")else:print("Contact not found")  # 处理联系人未找到的情况# 主循环
while True:print("\n1. Add Contact")print("2. View Contacts")print("3. Delete Contact")print("4. Exit")choice = input("Enter your choice: ")if choice == '1':add_contact()elif choice == '2':view_contacts()elif choice == '3':delete_contact()elif choice == '4':break  # 退出循环else:print("Invalid choice. Please try again.")  # 处理无效选择

简单的待办事项列表

创建一个简单的待办事项列表应用，可以添加、查看和删除待办事项。

todo_list = []  # 初始化一个空列表来存储待办事项# 添加任务的函数
def add_task():task = input("Enter a new task: ")todo_list.append(task)print("Task added!")# 查看所有任务的函数
def view_tasks():print("Your tasks:")for i, task in enumerate(todo_list, 1):print(f"{i}. {task}")# 删除任务的函数
def delete_task():view_tasks()  # 先显示所有任务task_index = int(input("Enter the task number to delete: ")) - 1if 0 <= task_index < len(todo_list):del todo_list[task_index]print("Task deleted!")else:print("Invalid task number")  # 处理无效输入# 主循环
while True:print("\n1. Add Task")print("2. View Tasks")print("3. Delete Task")print("4. Exit")choice = input("Enter your choice: ")if choice == '1':add_task()elif choice == '2':view_tasks()elif choice == '3':delete_task()elif choice == '4':break  # 退出循环else:print("Invalid choice. Please try again.")  # 处理无效选择