如何在Python中打印到stderr? [英] How to print to stderr in Python?

问题描述

有几种写stderr的方法:

There are several ways to write to stderr:

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

sys.stderr.write("spam\n")

os.write(2, b"spam\n")

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

这似乎与python#13的 zen ^†相矛盾，所以这里有什么区别，一种方法或另一种方法有什么优点或缺点?应该使用哪种方式?

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? Which way should be used?

^† _{应该有一种明显的方法，最好只有一种.}

推荐答案

我发现这是唯一的一个简短+灵活+可移植+可读的

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

from __future__ import print_function
import sys

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

功能eprint的使用方式与标准print功能相同:

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

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

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