Use python to plot graphs from csv file - simple example

Excercise: Try plotting the data from csv file using python and save the plot to a jpeg or png file, which we can later make it available for other apps.

csvfile name: test.csv

Location: Current working directory

Python version: 2.7.5

Modules used: matplotlib, numpy

Code:

import numpy as np
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
data = np.genfromtxt("test.csv", delimiter=",", names=["x", "y"])
plt.plot(data['x'], data['y'])
plt.savefig('/tmp/test1.png')

Code explanation:

numpy is needed to read the file in this example
matplotlib is needed for plotting the chart
matplotlib.use('Agg') is needed to supress the requirement of working DISPLAY variable

csv content:

1,2
2,5
3,7
4,7
5,9
6,10
7,20
8,21
9,22
10,30

Output:

Thank you