如何在一行中放置多个语句? [英] How to put multiple statements in one line?

问题描述

我不确定在什么标题下准确地思考这个问题，如果有点不具体的话，编码高尔夫似乎是合适的.

I wasn't sure under what title to ponder this question exactly, coding golf seems appropriate if a bit unspecific.

我对python有一些理解，但它们似乎很难阅读".在我看来，理解可能与以下代码相同:

I know a little bit of comprehensions in python but they seem very hard to 'read'. The way I see it, a comprehension might accomplish the same as the following code:

for i in range(10): if i == 9: print('i equals 9')

这段代码比理解目前的工作方式更容易阅读，但我注意到你不能在一行中有两个 : ......这也给我带来......

This code is much easier to read than how comprehensions currently work but I've noticed you cant have two : in one line ... this brings me too...

有什么办法可以将下面的例子放到一行中吗?

Is there any way I can get the following example into ONE LINE?

try:
    if sam[0] != 'harry':
        print('hello',  sam)
except:
    pass

这样的事情会很棒:

try: if sam[0] != 'harry': print('hellp',  sam)
except:pass

但是我又遇到了冲突的:我也很想知道是否有一种方法可以在没有 except 的情况下运行 try(或类似的东西)，我需要把 except:pass 在那里.这是一条废线.

But again I encounter the conflicting : I'd also love to know if there's a way to run try (or something like it) without except, it seems entirely pointless that I need to put except:pass in there. its a wasted line.

推荐答案

不幸的是，Python 无法实现您想要的(这使得 Python 对于命令行单行程序几乎毫无用处).即使显式使用括号也不能避免语法异常.您可以使用以分号分隔的一系列简单语句:

Unfortunately, what you want is not possible with Python (which makes Python close to useless for command-line one-liner programs). Even explicit use of parentheses does not avoid the syntax exception. You can get away with a sequence of simple statements, separated by semi-colon:

for i in range(10): print "foo"; print "bar"

但是，一旦您添加了一个引入缩进块的构造(如 if)，您就需要换行符.还有，

But as soon as you add a construct that introduces an indented block (like if), you need the line break. Also,

for i in range(10): print "i equals 9" if i==9 else None

是合法的，可能接近您想要的.

is legal and might approximate what you want.

至于 try ... except 事情:没有 except 将完全没用.try 说我想运行这段代码，但它可能会抛出异常".如果您不关心异常，请不要使用 try.但是一旦你把它放进去，你就会说我想处理一个潜在的异常".pass 然后表示您不希望专门处理它.但这意味着您的代码将继续运行，否则就不会.

As for the try ... except thing: It would be totally useless without the except. try says "I want to run this code, but it might throw an exception". If you don't care about the exception, leave away the try. But as soon as you put it in, you're saying "I want to handle a potential exception". The pass then says you wish to not handle it specifically. But that means your code will continue running, which it wouldn't otherwise.

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