代码练习源于ima：
只供熟悉知识点及练习敲代码使用！
"""print函数"""
# 示例1
# print('Hello, World!')
# print(123)
# print(1, 2, 3)
# print(1, 2, 3, sep= '-')
# print(1, 2, 3, sep= '')
# print(4, 5, 6, end='@')
# print(7, 8, 9, end='.')
# 示例2
# with open('output.txt', 'w', encoding='utf-8') as f:
# print('Hello, File!', file=f)"""变量的基本操作、变量的命名规范"""
# 示例1
# money = 8888
# print(money)
# 示例2
# money = 8888
# money2 = money
# print(money2)
# 示例3
# money = 888
# money2 = money
# total = money + money2
# print(total)
# 示例4
# money = 500
# money = money - 5
# money = money + 500
# print(money)
# 示例5
# name, age, sex = 'xiaobai', 35, '男'
# print(name)
# print(age)
# print(sex)
# 示例6
# a = 38
# b = 54
# username = 'xiaobai'
# employee_id = 59
# first_name = 'zhang'
# user_name = 'xiaobai'
# UserName = 'xiaobai'
# EmployeeId = 'zhang'
# userNmame = 'xiaobai'
# employeeId = 'zhang'
"""标识符的含义、标识符与变量名之间的关系、标识符的规定"""
# user_1 = 'xiaobai' # 正确
# user name = 'xiaobai' # 包含空格，会引发 SyntaxError
# 1name = 'xiaobai' # 以数字开头，会引发 SyntaxError
# _name = 'xiaobai' # 正确
# False = 1 # 不能是关键字！会引发 SyntaxError
# class = '2025-1' # 不能是关键字！会引发 SyntaxError
# class_ = '2025-1'
# a = 1
# print(a)
# print(A) # 会引发 NameError，因为变量 `A` 未定义
# print(123)
# Print(123) # 会引发 NameError，因为函数 `Print` 未定义（正确应为小写 `print`）
