Visualising number of texts initiated by participants of a WhatsApp thread over time

WeDontTalkAnymore.py

import re
import pandas as pd
import matplotlib.pyplot as plt

with open('/Users/vishalgupta/Downloads/WhatsApp Chat with MopHead.txt','r') as f:
  backup_text = f.read()
matches = re.findall('\n([0-9]+[/][0-9]+[/][0-9]+, [0-9]+[:][0-9]+ [AP]M - [a-zA-Z ]+[:])',backup_text)
sender_df = pd.DataFrame([{'time':pd.to_datetime(row.split('-')[0].strip()),'sender':row.split('-')[1].strip().replace(':','')} for row in matches])
sender_df.groupby('sender').time.hist(bins=30)
plt.show()