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What i want to do is to start a terminal session with the python command line interpreter and and further run a python file using the interpreter the python file could located anywhere.

What i mean to say is I have a python file demo.py in /home/one/two/

#demo.py
a=10
print("something")

so that when terminal opens i see the message something followed by the console prompt.

 something 
 >>>

My approach:

gnome-terminal --python -i ~/home/one/two/demo.py

this gives me following result

python: can't open file '~/Desktop/pydemo/demo.py': [Errno 2] No such file or directory

However when i run the same command from terminal window(not opened in the same directory as the demo.py file ) it works properly.

Can someone please explain what is happening here and if possible suggest a way t0 achieve whatever i mentioned above.

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You did not say HOW you start that command. If run from command line, gnome-terminal -- python -i ~/demo.py will work, because the shell will change ~ into your home before the arguments are passed to gnome-terminal. But here in your case, the error message states ~/... : not found : There was no shell to interpret the ~, so it was left as is, and effectively, there is no directory whose name is the sole character ~ in the directory the command happent to be started in.

Either explicitely use a shell to interpret the ~ :

gnome-terminal -- sh -c 'exec python -i ~/demo.py'

or do it yourself and proivde the full path name :

gnome-terminal -- python -i /home/me/demo.py

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