指定条形图pylab的颜色类型

Question

我使用pylab创建了以下条形图

对于每个条形图，是否有指定颜色的方法？以下是我的代码

import numpy as np
import matplotlib.pyplot as plt


month = ["dec-09", "jan", "feb"]
n = len(month)

air = np.array([383.909, 395.913, 411.714])

ind = np.arange(n)
width = 0.35

print(n)
print(ind)

plt.bar(ind, air, width, color="yellow")

plt.ylabel("KWH")
plt.title("winter")
plt.xticks(ind+width/2, ("dec-09", "jan", "feb"))
plt.show()

Answer 1

是。 plt.bar的文档字符串说：

Make a bar plot.

Make a bar plot with rectangles bounded by:

  `left`, `left` + `width`, `bottom`, `bottom` + `height`
        (left, right, bottom and top edges)

Parameters
----------
left : sequence of scalars
    the x coordinates of the left sides of the bars

[snip]

color : scalar or array-like, optional
    the colors of the bar faces

因此，您可以将颜色列表传递给plt.bar，它会分别为每个条形图着色。

所以你的例子变成了：

import numpy as np
import matplotlib.pyplot as plt

month = ["dec-09", "jan", "feb"]
n = len(month)

air = np.array([383.909, 395.913, 411.714])

ind = np.arange(n)
width = 0.35

fig, ax = plt.subplots()
ax.bar(ind, air, width, color=["yellow", 'cornflowerblue', 'darkgreen'])

ax.set_ylabel("KWH")
ax.set_title("winter")
ax.set_xticks(ind+width/2)
ax.set_xticklabels(("dec-09", "jan", "feb"))