python - 如何在Python中打印到stderr？(How to print to stderr in Python?)

Question

There are several ways to write to stderr:

(有几种写stderr的方法：)

# Note: this first one does not work in Python 3
print >> sys.stderr, "spam"

sys.stderr.write("spam
")

os.write(2, b"spam
")

from __future__ import print_function
print("spam", file=sys.stderr)

That seems to contradict zen of Python #13 ^? , so what's the difference here and are there any advantages or disadvantages to one way or the other?

(这似乎与zen的Python＃13 ^?相矛盾，所以这里有什么区别，一种方式或另一种方式有什么优点或缺点？)

Which way should be used?

(应该使用哪种方式？)

^? _{There should be one — and preferably only one — obvious way to do it.}

(^? _{应该有一种-最好只有一种-显而易见的方法。})

  ask by wim translate from so

Answer 1

I found this to be the only one short + flexible + portable + readable:

(我发现这是唯一的简短+灵活+便携式+可读的格式：)

from __future__ import print_function
import sys

def eprint(*args, **kwargs):
    print(*args, file=sys.stderr, **kwargs)

The function eprint can be used in the same way as the standard print function:

(可以使用与标准print功能相同的方式使用eprint功能：)

>>> print("Test")
Test
>>> eprint("Test")
Test
>>> eprint("foo", "bar", "baz", sep="---")
foo---bar---baz