Jupyter Notebook

Magics

1. %lsmagic will show all the magics, including line magics and cell magics.

   1. Line magics are magics start with one %;
   2. Cell magics are magics that can be used in the whole cell even with line breaks, where the cell should start with %%.

2. %env can be used when setting environment variables inside the notebook.

   %env MONGO_URI=localhost:27072
   

3. %%bash is a cell magic that allows bash commands in the cell.

   %%bash
   ls
   pip install datahubxyz
   

4. %%time enables timing of functions.

   %%time
   for i in range(1000):
       i*i
   

   %timeit is the corresponding line magic which times the function of the corresponding line.

Documentation

1. ?functionname (IPython, Jupyter): doc string of the function with better formatting
2. dir(modulename) (Python, IPython, Jupyter): to get the list of attributes of the module.
3. modulename.functionname.__doc__ (Python, IPython, Jupyter): to get the doc string of the function.