第一步，修改host文件
目的：是屏蔽掉Pycharm对激活码的验证
路径：/etc/hosts
在文件最后一行添加文本： 0.0.0.0 account.jetbrains.com
修改后文件如下：
## # Host Database # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost 0.0.0.0 account.jetbrains.com
第二步， 打开PyCharm，选择 Activate code（用激活码激活）
第三步，复制下载激活码，填入激活码框（有效期到2020年3月11号）
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