how to plot pareto chart in python
def pareto_plot(df, x=None, y=None, title=None, show_pct_y=False, pct_format='{0:.0%}'):
xlabel = x
ylabel = y
tmp = df.sort_values(y, ascending=False)
x = tmp[x].values
y = tmp[y].values
weights = y / y.sum()
cumsum = weights.cumsum()
fig, ax1 = plt.subplots()
ax1.bar(x, y)
ax1.set_xlabel(xlabel)
ax1.set_ylabel(ylabel)
ax2 = ax1.twinx()
ax2.plot(x, cumsum, '-ro', alpha=0.5)
ax2.set_ylabel('', color='r')
ax2.tick_params('y', colors='r')
vals = ax2.get_yticks()
ax2.set_yticklabels(['{:,.2%}'.format(x) for x in vals])
# hide y-labels on right side
if not show_pct_y:
ax2.set_yticks([])
formatted_weights = [pct_format.format(x) for x in cumsum]
for i, txt in enumerate(formatted_weights):
ax2.annotate(txt, (x[i], cumsum[i]), fontweight='heavy')
if title:
plt.title(title)
plt.tight_layout()
plt.show()