mirror of
https://github.com/m-lamonaca/dev-notes.git
synced 2025-04-08 11:56:41 +00:00
46 lines
2.7 KiB
Markdown
46 lines
2.7 KiB
Markdown
# 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 trace-back
|
|
`%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 ensemble 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
|