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Python/Jupyter/Jupiter Notebook.md

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+# Jupyter Notebooks Cheat Sheet
+
+## MAGIC COMMANDS
+
+`%quickref` Display the IPython Quick Reference Card  
+`%magic` Display detailed documentation for all of the available magic commands  
+`%debug` Enter the interactive debugger at the bottom of the last exception traceback  
+`%hist` Print command input (and optionally output) history  
+`%pdb` Automatically enter debugger after any exception  
+`%paste` Execute pre-formatted Python code from clipboard  
+`%cpaste` Open a special prompt for manually pasting Python code to be executed  
+`%reset` Delete all variables / names defined in interactive namespace  
+`%page` OBJECT Pretty print the object and display it through a pager  
+`%run` script.py Run a Python script inside IPython  
+`%prun` statement Execute statement with cProfile and report the profiler output  
+`%time` statement Report the execution time of single statement  
+`%timeit` statement Run a statement multiple times to compute an emsemble average execution time. Useful for timing code with very short execution time  
+`%who`, `%who_ls`, `%whos` Display variables defined in interactive namespace, with varying levels of information / verbosity  
+`%xdel` variable Delete a variable and attempt to clear any references to the object in the IPython internals  
+
+## INTERACTING WITH THE OPERATING SYSTEM
+
+`!cmd` Execute cmd in the system shell  
+`output = !cmd args` Run cmd and store the stdout in output  
+`%alias alias_name cmd` Define an alias for a system (shell) command  
+`%bookmark` Utilize IPython’s directory bookmarking system  
+`%cd` directory Change system working directory to passed directory  
+`%pwd` Return the current system working directory  
+`%pushd` directory Place current directory on stack and change to target directory  
+`%popd` Change to directory popped off the top of the stack  
+`%dirs` Return a list containing the current directory stack  
+`%dhist` Print the history of visited directories  
+`%env` Return the system environment variables as a dict  
+
+Input variables are stored in variables named like `iX`, where `X` is the input line number  
+
+IPython is capable of logging the entire console session including input and output  
+Logging is turned on by typing `%logstart`  
+
+Starting a line in IPython with an exclamation point `!`, or bang, tells IPython to execute everything after the bang in the system shell  
+The console output of a shell command can be stored in a variable by assigning the !-escaped expression to a variable  
+
+## TIMING CODE
+
+`%time` runs a statement once, reporting the total execution time  
+`%timeit` given an arbitrary statement, it has a heuristic to run a statement multiple times to produce a fairly accurate average runtime