Use matplotlib to plot scatter graph for ascii data

plot_ascii.py

#!/bin/env python

# plot scatter graph for ascii data
#
# The file is read from stdin.
#
# data format:
#
# x0 y0
# x1 y1
# ..
# xn yn
#
# example file:
#
# -3 9
# -2 4
# -1 1
# 0 0
# 1 1
# 2 4
# 3 9
#


import matplotlib.pyplot as plt
import sys

xes = []
yes = []

for line in sys.stdin.readlines():
    splited_line = line.split()

    x = float(splited_line[0])
    y = float(splited_line[1])

    xes.append(x)
    yes.append(y)


plt.plot(xes, yes, 'ro')
plt.show()