Imp points to be noted in python

pyCatch.txt

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                                 Python Notes
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#when you equate a list to a new list, it doesn't actually copy the list
but instead points to the locations in your original list thus any changes 
made in the new list reflects in the old one as well

my_list = your_list

#to avoid this do:

my_list = your_list[:] or my_list = your_list.copy()

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#dictionary key can be a tuple, string, number but not a list, because lists are 
mutable and dictionary doesn't like the key to change

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python doesn't support i++ or  i---
but does support i += 1, etc

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