matplotlib 2d线line，= plot逗号含义 [英] matplotlib 2d line line,=plot comma meaning
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问题描述
我正在逐步学习matplotlib的基础教程， 而我正在处理的示例代码是:
I'm walking through basic tutorials for matplotlib, and the example code that I'm working on is:
import numpy as np
import matplotlib.pylab as plt
x=[1,2,3,4]
y=[5,6,7,8]
line, = plt.plot(x,y,'-')
plt.show()
有人知道行(line,=plt.plot(x,y,'-'))后的逗号是什么意思吗?
我以为这是一个错字，但如果省略逗号，显然整个代码将无法正常工作.
Does anyone know what the comma after line (line,=plt.plot(x,y,'-')) means?
I thought it was a typo but obviously the whole code doesn't work if I omit the comma.
推荐答案
plt.plot返回绘制的Line2D对象的列表，即使只绘制一条线.
plt.plot returns a list of the Line2D objects plotted, even if you plot only one line.
该逗号将单个值分解为line.
That comma is unpacking the single value into line.
ex
a, b = [1, 2]
a, = [1, ]
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