最近结识了python

#! python
#coding=utf-8
import math
import numpy as np
import matplotlib.pyplot as plt
if __name__=='__main__':
x = np.arange(0, 2*math.pi, 0.1);
sin = np.sin(x);
cos = np.cos(x);
line_args=['r.-', 'go-'];
legends=['sine', 'cosine'];
plt.plot(x, sin, line_args[0], x, cos, line_args[1]);
plt.legend((legends[0], legends[1]), loc='upper right');
plt.xlabel('x');
plt.ylabel('y');
plt.grid();
plt.show();