`返回线，`和`返回线`之间的区别 [英] Difference between `return line, ` and `return line`

问题描述

在我最近的一个问题中，我引用了杰克范德普拉斯.可以找到以下代码:

In a recent question of mine, I quote some code by Jake Vanderplas. One can find the following code:

from matplotlib import pyplot as plt
from matplotlib import animation

fig = plt.figure()

ax = plt.axes(xlim=(0, 2), ylim=(0, 100))

line, = plt.plot([], [])

def init():
    line.set_data([], [])
    return line,

def animate(i):
    line.set_data([0, 2], [0,i])
    return line,

anim = animation.FuncAnimation(fig, animate, init_func=init,
                               frames=100, interval=20, blit=True)

plt.show()

在 init 或 animate 函数中，返回的值"是 line (带逗号).

In the init or animatefunction, the return "value" is line, (with a comma).

问题:line(不含逗号)的返回值"是否有区别?

Question: Is there a difference with a return "value" that would be line (whitout comma)?

谢谢

推荐答案

line, 是一个包含一个对象的元组. line 只是行对象.

line, is a tuple with one object in it. line is just the line object.

In [80]: line = object()

In [81]: line,
Out[81]: (<object at 0x9ee7fa8>,)

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