#file
idlelib/configHandler.py

#code
userDir = os.path.expanduser('~') 

#os
windows 7 sp1

it doesnt get final userdir path. it doesnt work correctly for userdir . 
this cause python3.3 IDLE GUI can not be opened on my pc . 
as per the docment says as follows:

help(os.path.expanduser)
Help on function expanduser in module ntpath:

expanduser(path)
    Expand ~ and ~user constructs.
    
    If user or $HOME is unknown, do nothing.

help(os.path.expandvars)
Help on function expandvars in module ntpath:

expandvars(path)
    Expand shell variables of the forms $var, ${var} and %var%.
    
    Unknown variables are left unchanged.

the right code may be:

userDir = os.path.expandvars(os.path.expanduser('~'))