Personal header for Jupyter Notebooks:

jupyter_header.txt

#cells will fill entire width of the browser
from IPython.display import display, HTML

display(HTML(data="""
<style>
    div#notebook-container    { width: 95%; }
    div#menubar-container     { width: 65%; }
    div#maintoolbar-container { width: 99%; }
</style>
"""))

#Tells Jupyter to reload custom classes from scratch everytime an import cell is run, if you edit a custom class
#between imports Jupyter would otherwise need to be restarted completely. Buyer beware: old class objects in the 
#current namespace will cause errors at execution
%load_ext autoreload
%autoreload 2

#switches matplotlib to show plots in the browser rather than opening a new window
%matplotlib inline

#always forget to do this for better looking plots
#import seaborn
#seaborn.set()

from jupyterthemes import jtplot

# currently installed theme will be used to
# set plot style if no arguments provided
jtplot.style()