深入了解Python中常见的数据类型

# 整数a = 10b = -5# 浮点数c = 3.14d = -2.5# 运算result1 = a + bresult2 = c * dprint(result1)  # 输出: 5print(result2)  # 输出: -7.85

# 字符串name = "Alice"message = 'Hello, world!'# 字符串拼接greeting = "Hi, " + name + "!"print(message)  # 输出: Hello, world!print(greeting)  # 输出: Hi, Alice!

# 列表fruits = ['apple', 'banana', 'orange']# 添加元素fruits.append('pear')# 删除元素fruits.remove('apple')# 修改元素fruits[1] = 'grape'# 查找元素index = fruits.index('orange')print(fruits)  # 输出: ['banana', 'grape', 'orange', 'pear']print(index)  # 输出: 2

# 元组weekdays = ('Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday')# 元素访问first_day = weekdays[0]last_day = weekdays[-1]print(first_day)  # 输出: Mondayprint(last_day)  # 输出: Friday

# 字典student = {    'name': 'Alice',    'age': 20,    'major': 'Computer Science'}# 添加键值对student['gender'] = 'Female'# 修改值student['age'] = 21# 访问值name = student['name']print(student)  # 输出: {'name': 'Alice', 'age': 21, 'major': 'Computer Science', 'gender': 'Female'}print(name)  # 输出: Alice

# 集合fruits = {'apple', 'banana', 'orange'}colors = {'red', 'green', 'orange'}# 交集intersection = fruits & colors# 并集union = fruits | colors# 差集difference = fruits - colorsprint(intersection)  # 输出: {'orange'}print(union)  # 输出: {'red', 'green', 'banana', 'orange', 'apple'}print(difference)  # 输出: {'apple', 'banana'}