python设置图例的⼤⼩_如何调整matplotlib图例框的⼤⼩？要控制图例中的填充(有效地使图例框变⼤)，请使⽤borderpadkwarg。
例如，以下是默认值：import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 10, 100)
fig, ax = plt.subplots()
for i in range(1, 6):
ax.plot(x, i*x + x, label='$y={i}x + {i}$'.format(i=i))
ax.legend(loc='upper left')
plt.show()
如果我们使⽤borderpad=2更改内部填充，则会使整个图例框变⼤(单位是字体⼤⼩的倍数，类似于em)：import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 10, 100)
fig, ax = plt.subplots()
for i in range(1, 6):
ax.plot(x, i*x + x, label='$y={i}x + {i}$'.format(i=i))
ax.legend(loc='upper left', borderpad=2)
plt.show()
或者，您可能需要更改项⽬之间的间距。使⽤labelspacing来控制：import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 10, 100)
fig, ax = plt.subplots()
for i in range(1, 6):
ax.plot(x, i*x + x, label='$y={i}x + {i}$'.format(i=i))
ax.legend(loc='upper left', labelspacing=2)
plt.show()
然⽽，在⼤多数情况下，同时调整labelspacing和borderpad最有意义：import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 10, 100)
fig, ax = plt.subplots()
for i in range(1, 6):
ax.plot(x, i*x + x, label='$y={i}x + {i}$'.format(i=i))
ax.legend(loc='upper left', borderpad=1.5, labelspacing=1.5)
plt.show()
另⼀⽅⾯，如果您有⾮常⼤的标记，您可能希望使图例中显⽰的⾏的长度更⼤。例如，默认值可能如下所⽰：import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 10, 5)
fig, ax = plt.subplots()
for i in range(1, 6):
ax.plot(x, i*x + x, marker='o', markersize=20,
label='$y={i}x + {i}$'.format(i=i))
linspace numpy
ax.legend(loc='upper left')
plt.show()
如果我们改变handlelength，我们将在图例中得到更长的⾏，这看起来更真实⼀些。(我还在这⾥调整borderpad和labelspacing以提供更多的空间。)import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 10, 5)
fig, ax = plt.subplots()
for i in range(1, 6):
ax.plot(x, i*x + x, marker='o', markersize=20,
label='$y={i}x + {i}$'.format(i=i))
ax.legend(loc='upper left', handlelength=5, borderpad=1.2, labelspacing=1.2)
plt.show()
在⽂档中，您可能还需要探索其他⼀些选项：Padding and spacing between various elements use following
keywords parameters. These values are measure in font-size
units. E.g., a fontsize of 10 points and a handlelength=5
implies a handlelength of 50 points. Values from rcParams
will be used if None.
=====================================================================
Keyword | Description
=====================================================================
borderpad the fractional whitespace inside the legend border
labelspacing the vertical space between the legend entries
handlelength the length of the legend handles
handletextpad the pad between the legend handle and text
borderaxespad the pad between the axes and legend border columnspacing the spacing between columns

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