网址：https://www.jetbrains.com/pycharm/download/previous.html
将下载好安装包解压
tar -xzvf pycharm-professional-2018.1.tar.gz
进入解压后文件夹的bin目录。在空白处右击
进入终端后，执行命令：sh ./pycharm.sh
弹出激活窗口进行激活。
提供了两种pycharm激活方式(都支持最新2019版本)。
本文只提供修改hosts激活
优点：方便快捷；
缺点：需要修改hosts文件。
1.修改hosts文件
将0.0.0.0 account.jetbrains.com和0.0.0.0 www.jetbrains.com添加到hosts文件最后，注意hosts文件无后缀，如果遇到无法修改或权限问题，可以采用覆盖的方法去替换hosts文件。
修改后请检查hosts文件是否修改，激活码无法激活的原因99.99%是因为hosts没有修改正确。
Windows系统hosts文件路径为：c:\windows\system32\drivers\etc
Ubantu(Linux)系统hosts文件路径为：/etc
复制激活码
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查看有效期
当你激活完毕后，PyCharm右下角会有个Registration小长条提示框，大致的内容为：You copy is Licensed to XXX意思就会告诉你：兄弟，你已经激活成功了，激活码的许可来源是：XXX。
查看有效期的步骤为点击：Help->About这里可以看到你的pycharm的版本号、许可来源、有效期、以及一些环境。
服务器激活是没有期限的，即为永久有效。
