While looking stuff about idlelib, I came to this thread in stackoverflow, so I posted own solution. I post it also here, as maybe somebody needs it (as for example \b looks ugly in IDLE)
Checking if program is run in IDLE
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TrustyTony
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IT Pro doing Eng-Fin-Eng translations
import sys
print('Running IDLE' if 'idlelib.run' in sys.modules else 'Out of IDLE')
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