Question: I had a program that ran successfully in `PyCharm`. I then just installed `Wing IDE` and tried to run that same program, but now I get the error 

```
C:\Python27\Lib\encodings\__init__.py", line 123

raise CodecRegistryError,\
                         ^ SyntaxError: invalid syntax

```

Can anyone help with this?

Answer: 
This occurs because you have an environment variable that refer to another Python version which is not the version you're using right now.

This how to fix this issue:

In a terminal window (cmd.exe), try the this command:

```
set | findstr /i python

```

If you get an output like this, `Path=C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLSClient\;C:\csvn\bin\;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system 32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Program Files\Java\jdk1.8.0_101\bin;C:\Apache\apache-ant-1.10.1\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;D:\Acedemic\Open Source Project\10.11\bin;C:\Program Files\Git\cmd;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Skype\Phone\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Users\Rajitha\AppData\Local\Programs\Python\Python36-32;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Users\Rajitha\AppData\Local\Microsoft\WindowsApps;
PYTHONHOME=C:\csvn\Python25\*`

**Remove the "PYTHONHOME" environmental variable.** 

If you get an output like this,`C:\Users\Acebulf>set | findstr /i python
Path=C:\Python27\Lib\site-packages\PyQt4;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows\System2\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\WiFi\bin\;C:\Program
Files\Common Files\Intel\WirelessCommon\;C:\Program Files\Microsoft SQL Server\1
10\Tools\Binn\;C:\Program Files (x86)\MiKTeX 2.9\miktex\bin\;C:\Program Files\In
tel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Python27\
PYTHONPATH=C:\Python27\Lib;C:\Python27\DLLs;C:\Python27\Lib\lib-tk;`

**Remove the "PYTHONPATH" environmental variable.**

This should fix the error!
It may be because you have different versions of Python installed, and you are using one version's interpreter with another version's libraries. If running under Windows, check your environment settings.