向绘制的直方图添加图例

Question

How can I a menage to add a label to a histogram, after its plotting?

import matplotlib.pyplot as plt
fig, ax1 = plt.subplots()
x = [2, 4, 6, 2, 4, 7, 6, 4, 4, 4, 4]

n, bins_edges, patches = ax1.hist(x, log=True, bins='doane', color="red")
binwidth =  bins_edges[1] - bins_edges[0]
mylabel = "Binwidth {}".format(binwidth)
ax1.hist[-1].set_label(mylabel)
plt.legend()
plt.show()

Answer 1

You can add string to legend by passing it to legend()

import matplotlib.pyplot as plt
fig, ax1 = plt.subplots()
x = [2, 4, 6, 2, 4, 7, 6, 4, 4, 4, 4]

n, bins_edges, patches = ax1.hist(x, log=True, bins='doane', color="red")
binwidth =  bins_edges[1] - bins_edges[0]
mylabel = "Binwidth {}".format(binwidth)


ax1.legend([mylabel])
plt.show()