python: new examples (#2457)

pages/common/python.md

@@ -10,10 +10,18 @@
 
 `python {{script.py}}`
 
-- Execute Python language single command:
+- Execute script as part of an interactive shell:
 
-`python -c {{command}}`
+`python -i {{script.py}}`
+
+- Execute a Python expression:
+
+`python -c "{{expression}}"`
 
 - Run library module as a script (terminates option list):
 
 `python -m {{module}} {{arguments}}`
+
+- Interactively debug a Python script:
+
+`python -m pdb {{script.py}}`