使用setuptools(pip)时如何打印警告和错误 [英] How to print warnings and errors when using setuptools (pip)
问题描述
我正在使用setuptools打包代码,以便可以使用
I am using setuptools to package code such that it can be easily installed using
cd project_name && pip install .
在设置过程中,我想警告用户有关预先存在的配置文件,并在系统上打印一些安装后说明.例如
During the setup process, I want to warn the user about pre-existing config files and print some post install instructions on the system. For example
/etc/project_name/project.conf exists. Not copying default config file.
我尝试使用print
和logging.warning()
,但是使用pip安装时仍然没有出现警告.我感觉自己缺少明显的东西.
I have tried to use print
and logging.warning()
but still the warnings don't appear when installing using pip. I have a feeling I am missing something obvious.
我们正在尝试在Redhat系列> = el6和Ubuntu> = 14.04LTS上支持3.0> python> = 2.6
We are trying to support 3.0 > python >= 2.6 on Redhat family >= el6 and Ubuntu >= 14.04LTS
推荐答案
如果您查看pip源,请在负责运行安装脚本的函数中,call_subprocess
(
If you take a look at the pip source, in the function responsible for running the setup script, call_subprocess
(source here), it says:
def call_subprocess(cmd, show_stdout=True, cwd=None, ...
...
# The obvious thing that affects output is the show_stdout=
# kwarg. show_stdout=True means, let the subprocess write directly to our
# stdout. Even though it is nominally the default, it is almost never used
# inside pip (and should not be used in new code without a very good
# reason); as of 2016-02-22 it is only used in a few places inside the VCS
# wrapper code. Ideally we should get rid of it entirely, because it
# creates a lot of complexity here for a rarely used feature.
#
# Most places in pip set show_stdout=False. What this means is:
# - We connect the child stdout to a pipe, which we read.
# - By default, we hide the output but show a spinner -- unless the
# subprocess exits with an error, in which case we show the output.
# - If the --verbose option was passed (= loglevel is DEBUG), then we show
# the output unconditionally. (But in this case we don't want to show
# the output a second time if it turns out that there was an error.)
简而言之,只有在以下情况下,您才能看到输出:
In short, you can see the output only if:
- 您的设置退出并出现错误,或者
- 用户使用
-v
(详细标志)呼叫pip
- your setup exits with an error, or
- user calls pip with
-v
, the verbose flag
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