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This code dumps a lot of internal source code info when executed with trace as:
python -m trace --trace file2.py
---[file2.py]
import subprocess
def ret():
 output = subprocess.check_output(['hg', 'id', '-nib'])
 print( output )
 print( output )
 print( output.strip() )
 print( output.strip().split() )
ret()
---
Normally, the last line of the output is:
['e67793ec2995+', '2162+', 'default']
But during trace call it is:
['subprocess.py(1180):', '_dup2(errwrite,', '2)', '---', 'modulename:', 'subprocess,', 'funcname:', '_dup2', 'subprocess.py(1174):', 'if', 'a', '==', 'b:', 'subprocess.py(1176):', 'elif', 'a', 'is', 'not', 'None:', 'subprocess.py(1184):', 'closed', '=', '{', 'None', '}',
...
etc.