fourrier series sine waves to make square wave

sinewaves.py

from sys import platform as sys_pf
if sys_pf == 'darwin':
    import matplotlib
    matplotlib.use("TkAgg")
from matplotlib import pyplot as plt
import numpy as np

x = np.arange(-np.pi,np.pi,0.01)


sin_cumulative = 0
for i in range(1,400,2):
    sin_cumulative += np.sin(i*x) / (i)

plt.plot(x,sin_cumulative)
plt.show()