graph_whatsapp.py

import re
import matplotlib.pyplot as plt

with open('chat.txt', 'r') as f:
    content = f.readlines()

all_dates = []
for line in content:
    dates = re.findall(r'[0-9]+/[0-9]+/[0-9]+', line)
    if dates:
        all_dates.extend(dates)

unique_dates = list(set(all_dates))
tuple_date_freq_list = []
for date in unique_dates:
    freq = all_dates.count(date)
    tuple_date_freq_list.append((date, freq))

plt.bar(*zip(*tuple_date_freq_list))
plt.xticks(rotation=90)
plt.show()