如何在一行上声明多个数组变量-python

Question

为了不使用这么多行来声明这样的变量：

open = []

high = []

low = []

close = []

我可以这样做：

open,high,low,close = []

实际上有效

Answer 1

没有。你问题中的例子不起作用。它会引发ValueError。这是因为Python试图将四个值解压缩到open，high，low和closed，但是如果找不到任何值（这会在Python中引发错误） 2.x和Python 3.x）：

>>> open, high, low, close = []
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: not enough values to unpack (expected 4, got 0)
>>> 

要初始化同一行上的所有列表变量，您需要提供所有四个变量的列表：

>>> open, high, low, closed = [], [], [], []
>>> 
>>> open
[]
>>> high
[]
>>> low
[]
>>> closed
[]
>>>