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These observations are noted when the system locale is set to 'iso-88591'
1. Ok, for some reason I'm able to execute this command without any error in Linux (idle window is opening with a file name as 'astralE.py'). Because the character 'E' is automatically being shown and treated as 'E' in both terminal and python command line interpreter(similar for chars 'Z' = 'z' and 'P' = 'P').
2. But i'm unable to save/make a file with filname 'astralE.py' and hence unable to run it. The following errors are thrown then : 
Exception in Tkinter callback
Traceback (most recent call last):
 File "/home/sanad/devpy/pessoc/cpython/Lib/tkinter/__init__.py", line 1549, in __call__
 return self.func(*args)
 File "/home/sanad/devpy/pessoc/cpython/Lib/idlelib/MultiCall.py", line 176, in handler
 r = l[i](event)
 File "/home/sanad/devpy/pessoc/cpython/Lib/idlelib/IOBinding.py", line 339, in save
 self.save_as(event)
 File "/home/sanad/devpy/pessoc/cpython/Lib/idlelib/IOBinding.py", line 353, in save_as
 if self.writefile(filename):
 File "/home/sanad/devpy/pessoc/cpython/Lib/idlelib/IOBinding.py", line 379, in writefile
 with open(filename, "wb") as f:
UnicodeEncodeError: 'ascii' codec can't encode character '\U0001d53c' in position 39: ordinal not in range(128)
I'm trying to figure out the root of the problem, feel free to give your inputs