Update - newly added tricks are added to the top, and will be added as I discover them. A few things that I’ve come across from extensive googling have been game changers for me in Python programming. Check them out below:

• Increasing width of Jupyter notebook cells (source):

from IPython.core.display import display, HTML 
display(HTML("<style>.container { width:100% !important; }</style>"))

• Storing variables:

When you want to work across multiple jupyter notebooks, you can store your data. In the notebook where the data exists, run this command:

%store df # where df is the name of your data

Then in whichever notebook you’d like to pull the data into, run this:

%store -r df # -r probably stands for retrieve or something

After running that command, you can use the data in your new notebook.

• Execution timing:

%install_ext https://raw.github.com/cpcloud/ipython-autotime/master/autotime.py
%load_ext autotime

I think that autotime as an ipython-magic extension is being deprecated, so try the following:

conda install -c conda-forge ipython-autotime
import autotime

This is exclusive to iPython/Jupyter notebook. In order to have the run time printed for each cell, simply run this once. It’s super useful and you don’t have to write %%time at the top of each cell. The only annoying thing is that if the execution time was 0, it prints out this assertion error.

Error in callback <bound method LineWatcher.stop of <autotime.LineWatcher object at 0x000001852A822D68>> (for post_run_cell):

---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
C:\ProgramData\Anaconda3\lib\site-packages\autotime.py in stop(self)
     23         if self.start_time:
     24             diff = time.time() - self.start_time
---> 25             assert diff > 0
     26             print('time: %s' % format_delta(diff))
     27 

AssertionError: 

I fixed this by editing the py file and erasing the assertion:

filename = 'C:\\ProgramData\\Anaconda3\\lib\\site-packages\\autotime.py'
with open(filename, 'r') as file:
    # read a list of lines into data
    data = file.readlines()
# remove line 25 with the assertion (found this from error message)
data[25] = ''
# write everything back
with open(filename, 'w') as file:
    file.writelines( data )

Or you could simply open the autotime.py file and delete the line manually.

• Warning suppresion:

import warnings
warnings.filterwarnings("ignore")

This command will prevent tons of error messages from cluttering up your output. It’s fantastic.

• Clean Matplotlib Output

When you use

%matplotlib inline

then you enable all plots to appear in the output, instead of just the last run plot in a cell, or having to write plt.show() after each. When plotting, you’ll get a ton of ugly output. For example, the following command plot:

from matplotlib import pyplot as plt
%matplotlib inline
plt.plot(df[['col1','col2']])

will spit out this before the chart:

[<matplotlib.lines.Line2D at 0x1955e5fbf28>,
 <matplotlib.lines.Line2D at 0x195606e5a58>]

The simple solution is to put a semicolon on the last line of your cell.

plt.plot(df[['col1','col2']]);

This way, none of that text shows up above your plotted data.