What's the difference between Python's sub

问题:

I've been trying to understand for a while now what's the difference between subprocess.call and subprocess.run. I know the last one is new on Python 3.5 and both are based on subprocess.Popen, but I'm not able to understand the difference yet.

回答1:

The definition of subprocess.call() clearly mentions:

It is equivalent to: run(...).returncode (except that the input and check parameters are not supported)

As the Python 3.5's subprocess document says:

Prior to Python 3.5, these three functions (i.e. .call(), .check_call(), .check_output()) comprised the high level API to subprocess. You can now use run() in many cases, but lots of existing code calls these functions.

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It is a common practice that when some functions are replaced, they are not instantly deprecated but there is a support window for them for some versions. This helps in preventing the breakage of older code when the language version is upgraded. I do not know whether .call() is going to be replaced in the future or not. But based on the document, what I know is that they are pretty much same.