如何在IPython中将变量传递给magic'run'函数 [英] How to pass a variable to magic ´run´ function in IPython

问题描述

我想做类似以下的事情：

I want to do something like the following:

In[1]: name = 'long_name_to_type_every_now_and_then.py'

In[2]: %run name

但这实际上是试图运行'name.py'，这不是我想要做的。

but this actually tries to run 'name.py', which is not what I want to do.

是否有通用的方法来改变变量成串？

Is there a general way to turn variables into strings?

如下所示：

In[3]: %run %name%

推荐答案

IPython使用<$ c扩展变量$ c> $ name ，bash-style。 所有魔法都是如此，而不仅仅是％run 。

IPython expands variables with $name, bash-style. This is true for all magics, not just %run.

所以你会执行：

In [1]: filename = "myscript.py"

In [2]: %run $filename
['myscript.py']

myscript.py包含：

myscript.py contains:

import sys
print(sys.argv)

通过Python的花式字符串格式，您甚至可以将表达式放在 {} 中：

Via Python's fancy string formatting, you can even put expressions inside {}:

In [3]: args = ["arg1", "arg2"]

In [4]: %run $filename {args[0]} {args[1][-2:]}
['myscript.py', 'arg1', 'g2']

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