print multiplication tables for children, with color formatting if needed. (python, pandas)

multiplication_tables.py

import pandas as pd
import numpy as np

def style_dataframe(df, maxvals=None):
    result = df.style
    result.set_properties(**{'text-align': 'center'})
    result.set_properties(**{'font-family': 'monospace'})
    result.set_properties(**{'font-weight': 'bold'})   

    result.set_table_styles([  
                                {'selector' : 'td', 'props' : [('border', '1px solid lightblue')]},
                                {'selector' : 'th', 'props' : [('border', '1px solid lightblue')]},
                                {'selector' : 'th', 'props' : [('padding', '1em')]},
                                {'selector' : 'td', 'props' : [('padding', '1em')]},
                                {'selector' : '', 'props' : [('border-collapse', 'collapse')]}])
    result.format(precision=2)
    result.background_gradient(cmap='GnBu', axis=None)
    # result.bar(subset=["8", "9"], color='#FFA07A')
    result = result.render()
    result = result.replace('\n', '')
    return result

# modify here to skip some items in the table to make the child guess. 
def mul(x):
    return x.name * x.index 

# output is html, open/print the output from a browser  
with open('multiply.html', 'w') as mfile:
    df = pd.DataFrame(np.random.randn(10, 10), columns=range(1, 11))
    df.index += 1 # make index start from 1 instead of 0, 
                  # kids don't need to know the horrors of 
                  # the real world at this age :D
    df = df.apply(mul)
    mfile.write(style_dataframe(df))