Cacher is the code snippet organizer for pro developers

Basic commands
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# step - one line at a time
# next - execute next line including any function calls contained
# cont - continue execution
# print - print value of a variable
# break <file:lineno | function> [condition] - set breakpoint on a line or function, optionally only for certain conditions
# break - list all break points and number of times they have been triggered
# args - prints args of a call
# list - prints surrounding lines
# where - shows stacktrace
# up - go up the stack 
# ll - long list (in 3.2) - only shows current function
# pp - pretty print 
# !<input> - don't intrepret as a pdb command
# help <command> - prints help about a command


Customization
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Can be placed in ~/.pdbrc 

# alias <alias> <command> - define custom aliases
# ? - Can setup commands to be executed automatically on certain breakpoints 

Setup stepwatch and nextwatch aliases in pdb
http://stackoverflow.com/questions/7668979/how-do-you-watch-a-variable-in-pdb