安装来源必须是 python.org 的 Windows installer (64-bit)，不要用微软商店版。商店版的路径被沙箱化，虚拟环境激活和 PATH 行为经常出怪问题。安装时有一个必须勾选的选项： Add Python 3.x to PATH。漏掉这一步，后面 python 和 pip 都会提示不是内部或外部命令。

本文系统讲解Mac、Windows、Linux三大平台下Python安装与PyCharm配置的关键实践，涵盖版本选择、路径规范、权限管理、虚拟环境创建与PyCharm解释器配置等核心环节。重点强调避免系统Python干扰、PATH环境变量正确设置、UTF-8编码统一、pip国内源配置及requirements.txt依赖管理。所有方案均面向开发可用性验证 ...

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