Trying to run python code with TKinter-based widgets from a virtualenv.
user@computer:~/myproject$ env/bin/python Python 2.7.3 (default, Sep 26 2012,
For me the solution was copying the folder tcl from
C:\Users\{myUser}\Python3.5\tcl
to
C:\Users\{myUser}\{myVirtualEnv}
replace {myUser} and {myVirtualEnv} with your specific directory names.