Python全栈基础篇Day02后端内容简介与历史Python诞生于1991年由Guido van Rossum创建。其设计哲学强调代码可读性和简洁性使得Python成为后端开发的理想选择。Python的后端框架如Django和Flask极大简化了Web应用开发流程。Python 3.x版本在2008年发布解决了早期版本中的诸多设计缺陷成为当前主流。简单数据类型与变量Python是动态类型语言变量无需显式声明类型。常见数据类型包括整数、浮点数、字符串和布尔值。整数和浮点数示例age 25 # 整数 height 1.75 # 浮点数字符串操作name Alice greeting fHello, {name}! # f-string格式化布尔类型is_active True has_permission FalsePython运行模式Python支持交互式模式和脚本模式。交互式模式适合快速测试代码片段而脚本模式用于完整程序开发。交互式示例在终端输入python启动 2 3 5脚本模式示例保存为hello.pyprint(Hello, World!)运行命令python hello.py输入输出Python提供内置函数处理输入输出。input()函数获取用户输入print()函数输出结果。输入示例user_input input(Enter your name: ) print(fWelcome, {user_input}!)格式化输出price 19.99 print(Price: %.2f % price) # 旧式格式化 print(Price: {:.2f}.format(price)) # str.format()实战演示构建简单计算器演示基础概念整合# 简单计算器 def calculator(): print(Simple Calculator) num1 float(input(Enter first number: )) operator input(Enter operator (, -, *, /): ) num2 float(input(Enter second number: )) if operator : result num1 num2 elif operator -: result num1 - num2 elif operator *: result num1 * num2 elif operator /: result num1 / num2 else: print(Invalid operator) return print(fResult: {result}) calculator()每日一题题目编写程序将华氏温度转换为摄氏温度。公式C (F - 32) * 5/9解决方案def fahrenheit_to_celsius(): f float(input(Enter temperature in Fahrenheit: )) c (f - 32) * 5 / 9 print(f{f}°F {c:.2f}°C) fahrenheit_to_celsius()变量命名规范Python推荐使用snake_case命名变量和函数。常量通常使用全大写字母。避免使用Python关键字作为变量名。良好命名示例user_count 10 MAX_RETRIES 3类型转换Python提供内置函数进行类型转换在处理用户输入时特别有用。转换示例num_str 123 num_int int(num_str) # 字符串转整数 num_float float(3.14) # 字符串转浮点数 str_num str(456) # 数字转字符串注释与文档字符串单行注释使用#多行注释使用三引号。文档字符串docstring用于函数说明。示例def add(a, b): Add two numbers and return the result. Parameters: a (int/float): First number b (int/float): Second number Returns: int/float: Sum of a and b return a b错误处理基础使用try-except处理潜在错误特别是用户输入场景。示例try: age int(input(Enter your age: )) except ValueError: print(Please enter a valid number)运算符扩展除基本算术运算符外Python还提供比较运算符和逻辑运算符。比较运算符x 5 print(x 5) # True print(x ! 3) # True逻辑运算符is_admin True has_access False print(is_admin and has_access) # False print(is_admin or has_access) # True代码组织基础随着代码量增加合理组织代码变得重要。Python使用缩进通常4个空格定义代码块。条件语句示例score 85 if score 90: grade A elif score 80: grade B else: grade C print(fGrade: {grade})开发环境建议推荐使用VS Code或PyCharm等IDE进行Python开发。这些工具提供代码补全、调试等功能显著提升开发效率。虚拟环境venv有助于管理项目依赖。 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python全栈(基础篇)——day02:后端内容(简介与历史+简单数据类型与变量+python运行模式+输入输出+实战演示+每日一题)
Python全栈基础篇Day02后端内容简介与历史Python诞生于1991年由Guido van Rossum创建。其设计哲学强调代码可读性和简洁性使得Python成为后端开发的理想选择。Python的后端框架如Django和Flask极大简化了Web应用开发流程。Python 3.x版本在2008年发布解决了早期版本中的诸多设计缺陷成为当前主流。简单数据类型与变量Python是动态类型语言变量无需显式声明类型。常见数据类型包括整数、浮点数、字符串和布尔值。整数和浮点数示例age 25 # 整数 height 1.75 # 浮点数字符串操作name Alice greeting fHello, {name}! # f-string格式化布尔类型is_active True has_permission FalsePython运行模式Python支持交互式模式和脚本模式。交互式模式适合快速测试代码片段而脚本模式用于完整程序开发。交互式示例在终端输入python启动 2 3 5脚本模式示例保存为hello.pyprint(Hello, World!)运行命令python hello.py输入输出Python提供内置函数处理输入输出。input()函数获取用户输入print()函数输出结果。输入示例user_input input(Enter your name: ) print(fWelcome, {user_input}!)格式化输出price 19.99 print(Price: %.2f % price) # 旧式格式化 print(Price: {:.2f}.format(price)) # str.format()实战演示构建简单计算器演示基础概念整合# 简单计算器 def calculator(): print(Simple Calculator) num1 float(input(Enter first number: )) operator input(Enter operator (, -, *, /): ) num2 float(input(Enter second number: )) if operator : result num1 num2 elif operator -: result num1 - num2 elif operator *: result num1 * num2 elif operator /: result num1 / num2 else: print(Invalid operator) return print(fResult: {result}) calculator()每日一题题目编写程序将华氏温度转换为摄氏温度。公式C (F - 32) * 5/9解决方案def fahrenheit_to_celsius(): f float(input(Enter temperature in Fahrenheit: )) c (f - 32) * 5 / 9 print(f{f}°F {c:.2f}°C) fahrenheit_to_celsius()变量命名规范Python推荐使用snake_case命名变量和函数。常量通常使用全大写字母。避免使用Python关键字作为变量名。良好命名示例user_count 10 MAX_RETRIES 3类型转换Python提供内置函数进行类型转换在处理用户输入时特别有用。转换示例num_str 123 num_int int(num_str) # 字符串转整数 num_float float(3.14) # 字符串转浮点数 str_num str(456) # 数字转字符串注释与文档字符串单行注释使用#多行注释使用三引号。文档字符串docstring用于函数说明。示例def add(a, b): Add two numbers and return the result. Parameters: a (int/float): First number b (int/float): Second number Returns: int/float: Sum of a and b return a b错误处理基础使用try-except处理潜在错误特别是用户输入场景。示例try: age int(input(Enter your age: )) except ValueError: print(Please enter a valid number)运算符扩展除基本算术运算符外Python还提供比较运算符和逻辑运算符。比较运算符x 5 print(x 5) # True print(x ! 3) # True逻辑运算符is_admin True has_access False print(is_admin and has_access) # False print(is_admin or has_access) # True代码组织基础随着代码量增加合理组织代码变得重要。Python使用缩进通常4个空格定义代码块。条件语句示例score 85 if score 90: grade A elif score 80: grade B else: grade C print(fGrade: {grade})开发环境建议推荐使用VS Code或PyCharm等IDE进行Python开发。这些工具提供代码补全、调试等功能显著提升开发效率。虚拟环境venv有助于管理项目依赖。 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