我在matplotlib中绘制极散点图，每个数据点附近都有注解。
我需要将注解设为粗体（因为它们重叠了），同时将r轴标记设为粗体（并将轴标记设为垂直线右侧）。
我的代码：

import numpy as np
import matplotlib.pyplot as plt

month = ['Feb-16','Mar-16', 'Apr-16', 'May-16', 'Jun-16', 'Jul-16',
        'Aug-16', 'Sep-16', 'Nov-16', 'Dec-16', 'Jan-17']
phi = np.array([3.272, 3.185, 3.159, 2.13, 2.879, 2.617, 2.705, 
                2.53, 3.228, 3.054, np.pi]) 
r = np.array([1006.225, 1006.083, 1007.189, 1007.0614, 1002.909, 1001.053, 
              1001.953, 1006.609, 1011.403, 1013.885,1013.391])



fig = plt.figure()
ax = fig.add_subplot(111, projection='polar')
c = ax.scatter(phi, r, alpha=0.75)
ax.set_ylim(1000,1014)
ax.set_xlim(np.pi/2,(7/6.)*np.pi)
ax.yaxis.set_tick_params(labelsize=12)
for i in range(len(r)): 
    ax.annotate(month[i],
            xy=(phi[i], r[i]))
lines, labels = ax.set_thetagrids( range(90,240,30),
                           ('12:00', '11:00', '10:00','9:00', '8:00'),
                           fontweight='bold')

plt.show()

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