https://github.com/vipulnaik/donations/issues/12

plot.py

#!/usr/bin/env python3

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

calls = 0
data = []
with open(sys.argv[1], "r") as f:
    for line in f:
        if not line.strip():
            continue
        calls += 1
        try:
            time, donee = line.strip().split("\\t")
            data.append((time, calls, donee))
        except ValueError:
            pass

df = pd.DataFrame(data, columns=['time', 'calls', 'donee'])
df['time'] = pd.to_datetime(df['time'])
df = df.set_index('time')
df.calls.plot(linestyle='none', marker='.', rot=45)
plt.ylabel("cumulative number of donees")
plt.show()