长程序使用python -c开关 [英] Long programs using python -c switch

问题描述

我想使用python的东西，我一直在使用bash。可以对长程序使用-c开关，例如。一个for循环有两个语句？这将允许我直接从命令行使用python，就像bash或php。

I would like to use python for things I've been doing using bash. Is it possible to use the -c switch for long programs, e.g. a for loop with two statements? This would let me use python directly from command line, just like bash or php.

谢谢。

：不知道我错过了，只是做一个python -c'，然后按enter键，我想做的。我试过很多变化，一个使用\但是没有工作，所以我问的问题。
eg

Don't know how I missed it, simply doing a python -c ' and then pressing enter does what I've wanted to do. I'd tried a lot of variations, and one using a \ but that didn't work, so I asked the question. e.g.

$python -c '
>print "x"
>for i in range(3):
>   print "y" '

做我想做的事，尽管Rod的回答看起来也不错。

does what I wanted to do, though Rod's answer looks good too.

推荐答案

如果你的底层shell是bash没有问题，因为如果打开'（报价）尚未关闭 - 例如：

No problem if your underlying shell is bash, since you can continue an argument across multiple lines if an opened ' (quote) is not yet closed -- e.g.:

$ python -c'for x in range(3):
>   if x!=1:
>     print x'
0
2
$

c $ c>> 是bash的默认 PS2 ，多行延续提示，区别于 $ ，AKA PS1 是正常的开始输入命令提示。

The > is bash's default PS2, the "multi-line continuation prompt", as distinguished from $, AKA PS1, the normal "start entering a command" prompt.

你不能使用这样的多行连续，多个嵌套的块语句（如 if 在一个循环内）否则会有问题。

If you can't use such multi-line continuation, multiple nested block statements (such as an if within a loop) could otherwise be problematic.

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