New imports... switched order so that PyCharm will pick up with Python 3 import first

ProgrammingClassExamples/9c Plot (axes pi format).py

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+#Plt using matplylib, plotly and numpy
+#Tony Crewe
+#Sep 2017 updated Sep 2018
+
+import matplotlib.pyplot as plt
+import numpy as np
+import matplotlib.ticker as ticker
+
+fig=plt.figure()
+ax = fig.add_subplot(111)
+x = np.linspace(-np.pi*2, np.pi*2, 100)
+y= np.sin(x)
+ax.plot(x/np.pi,y)
+
+ax.set_title('sin(x)')
+ax.spines['left'].set_position('zero')
+ax.spines['right'].set_color('none')
+ax.spines['bottom'].set_position('zero')
+ax.spines['top'].set_color('none')
+
+#Format axes - nicer eh!
+ax.xaxis.set_major_formatter(ticker.FormatStrFormatter('%g $\pi$'))
+
+plt.show()
+
+
+
+