plotting numbers from stdin

plot.py

#!/usr/bin/env python

import random
import matplotlib.pyplot as plt
import numpy as np
import sys

def histnums(filename, x, nbins=100):
    fig, ax = plt.subplots()
    ax.hist(np.array(x), bins=nbins, density=True)
    plt.savefig(filename)

def readinput():
    return [float(x) for x in sys.stdin if x.strip()]

if __name__ == "__main__":
    histnums(sys.argv[1], readinput())