调用“del"函数调用结果导致“SyntaxError: can't delete function call" [英] Calling "del" on result of Function call results in "SyntaxError: can't delete function call"

问题描述

考虑下面的例子:

random_tile = random.choice(tiles)
del random_tile

它首先将 tiles 列表中的一个随机元素分配给一个变量，然后在该变量上调用一个函数.

It first assigns a random element from the list tiles to a variable, and then calls a function on that variable.

那么如果我们想缩短代码如下:

Then if we want to shorten the code as follows:

del random.choice(tiles)

我们会得到一个SyntaxError: can't delete function call.我尝试了 eval() 没有运气.怎么解决?

We would get a SyntaxError: can't delete function call. I tried eval() with no luck. How can this be solved?

我想要做的是从 tiles 列表中随机删除一个元素.除了使用 random.randint() 作为索引之外，我以为我找到了一种更紧凑的方法，但我想不是.

What I am trying to do is to remove a element from the tiles list at random. I thought I found a more compact way of doing it other than using random.randint() as the index, but I guess not.

是否有 Pythonic/传统的方式来做到这一点?

Is there a pythonic/conventional way of doing this otherwise?

推荐答案

del 不是函数，而是创建del 语句 例如del var.您不能将其用作函数或在函数上使用，它只能应用于变量名称、变量名称列表或订阅和切片，例如

del is not a function, it is a keyword to create del statements e.g. del var. You can't use it as a function or on a function, it can only be applied to a variable name, list of variable names or subscriptions and slicings e.g.

del a
del a,b
del l[0]
del l[:]

要删除随机项目，您可以试试这个

random_tile.remove(random.choice(tiles))

但是这不是删除项目的最佳方法，因为这可能意味着内部搜索项目和项目比较，如果项目不是唯一的也不起作用，所以最好是随机索引并删除

BUT it is not best way to remove items because it could mean a internal search for items and item comparison, also won't work if items are not unique, so best would be to get random index and delete that

index = random.randint(0, len(l)-1)
del l[index]

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