极坐标，双坐标图

import matplotlib.pyplot as plt
from pylab import *

fig=plt.figure()
axes=fig.add_axes([0.0,0.2,0.6,0.6],polar=True)
t=linspace(0,2*pi,100)
axes.plot(t,t,color='b',lw=2)
plt.savefig('E:\python\慕课网 python\.idea\photo\极坐标图.png',dpi=400,bbox_inches='tight')
plt.show()

import matplotlib.pyplot as plt
from pylab import *
fig,axes1=plt.subplots(figsize=(8,8))
x=linspace(0,5,10)
axes1.plot(x,x**2,ls=":",c='r')
axes1.set_ylabel('area$(m^2)$',fontsize=18,color='darkblue')
for label in axes1.get_yticklabels():
    label.set_color('black')

axes2=axes1.twinx()
axes2.plot(x,x**3,ls='-',c='g')
axes2.set_ylabel('area$(m^3)$',fontsize=18,color='darkblue')
for label in axes1.get_yticklabels():
    label.set_color('g')

plt.savefig('E:\python\慕课网 python\.idea\photo\双坐标.png',dpi=400,bbox_inches='tight')
plt.show()