问题:如何抑制熊猫未来警告?

当我运行程序时,Pandas每次都会发出如下“未来警告”。

D:\Python\lib\site-packages\pandas\core\frame.py:3581: FutureWarning: rename with inplace=True  will return None from pandas 0.11 onward
  " from pandas 0.11 onward", FutureWarning) 

我得到了消息,但我只是想一次又一次地停止Pandas显示这样的消息,是否可以设置任何buildin参数,以使Pandas不会弹出“未来警告”?

When I run the program, Pandas gives ‘Future warning’ like below every time.

D:\Python\lib\site-packages\pandas\core\frame.py:3581: FutureWarning: rename with inplace=True  will return None from pandas 0.11 onward
  " from pandas 0.11 onward", FutureWarning) 

I got the msg, but I just want to stop Pandas showing such msg again and again, is there any buildin parameter that I can set to let Pandas not pop up the ‘Future warning’ ?


回答 0

github上发现了这个…

import warnings
warnings.simplefilter(action='ignore', category=FutureWarning)

import pandas

Found this on github

import warnings
warnings.simplefilter(action='ignore', category=FutureWarning)

import pandas

回答 1

@bdiamante的答案可能只会部分帮助您。如果您在取消警告后仍然收到消息,那是因为pandas库本身正在打印消息。除非您自己编辑Pandas源代码,否则您将无能为力。也许内部有一个抑制它们的选项,或者是一种覆盖事物的方法,但是我找不到。


对于那些需要知道为什么的人…

假设您要确保干净的工作环境。在脚本的顶部,放pd.reset_option('all')。使用Pandas 0.23.4,您将获得以下信息:

>>> import pandas as pd
>>> pd.reset_option('all')
html.border has been deprecated, use display.html.border instead
(currently both are identical)

C:\projects\stackoverflow\venv\lib\site-packages\pandas\core\config.py:619: FutureWarning: html.bord
er has been deprecated, use display.html.border instead
(currently both are identical)

  warnings.warn(d.msg, FutureWarning)

: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

C:\projects\stackoverflow\venv\lib\site-packages\pandas\core\config.py:619: FutureWarning:
: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

  warnings.warn(d.msg, FutureWarning)

>>>

按照@bdiamante的建议,您可以使用该warnings库。现在,诚如其言,警告已被删除。但是,仍然存在一些令人讨厌的消息:

>>> import warnings
>>> warnings.simplefilter(action='ignore', category=FutureWarning)
>>> import pandas as pd
>>> pd.reset_option('all')
html.border has been deprecated, use display.html.border instead
(currently both are identical)


: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

>>>

实际上,禁用所有警告会产生相同的输出:

>>> import warnings
>>> warnings.simplefilter(action='ignore', category=Warning)
>>> import pandas as pd
>>> pd.reset_option('all')
html.border has been deprecated, use display.html.border instead
(currently both are identical)


: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

>>>

从标准库的角度来看,这些不是真正的警告。熊猫实施自己的警告系统。grep -rn在警告消息上运行表明,该pandas警告系统已在core/config_init.py以下位置实现:

$ grep -rn "html.border has been deprecated"
core/config_init.py:207:html.border has been deprecated, use display.html.border instead

进一步的追踪表明,我没有时间这样做。而且您可能也不是。希望这可以使您免于跌倒,或者可以激发某人找出如何真正压制这些消息的方法!

@bdiamante’s answer may only partially help you. If you still get a message after you’ve suppressed warnings, it’s because the pandas library itself is printing the message. There’s not much you can do about it unless you edit the Pandas source code yourself. Maybe there’s an option internally to suppress them, or a way to override things, but I couldn’t find one.


For those who need to know why…

Suppose that you want to ensure a clean working environment. At the top of your script, you put pd.reset_option('all'). With Pandas 0.23.4, you get the following:

>>> import pandas as pd
>>> pd.reset_option('all')
html.border has been deprecated, use display.html.border instead
(currently both are identical)

C:\projects\stackoverflow\venv\lib\site-packages\pandas\core\config.py:619: FutureWarning: html.bord
er has been deprecated, use display.html.border instead
(currently both are identical)

  warnings.warn(d.msg, FutureWarning)

: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

C:\projects\stackoverflow\venv\lib\site-packages\pandas\core\config.py:619: FutureWarning:
: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

  warnings.warn(d.msg, FutureWarning)

>>>

Following the @bdiamante’s advice, you use the warnings library. Now, true to it’s word, the warnings have been removed. However, several pesky messages remain:

>>> import warnings
>>> warnings.simplefilter(action='ignore', category=FutureWarning)
>>> import pandas as pd
>>> pd.reset_option('all')
html.border has been deprecated, use display.html.border instead
(currently both are identical)


: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

>>>

In fact, disabling all warnings produces the same output:

>>> import warnings
>>> warnings.simplefilter(action='ignore', category=Warning)
>>> import pandas as pd
>>> pd.reset_option('all')
html.border has been deprecated, use display.html.border instead
(currently both are identical)


: boolean
    use_inf_as_null had been deprecated and will be removed in a future
    version. Use `use_inf_as_na` instead.

>>>

In the standard library sense, these aren’t true warnings. Pandas implements its own warnings system. Running grep -rn on the warning messages shows that the pandas warning system is implemented in core/config_init.py:

$ grep -rn "html.border has been deprecated"
core/config_init.py:207:html.border has been deprecated, use display.html.border instead

Further chasing shows that I don’t have time for this. And you probably don’t either. Hopefully this saves you from falling down the rabbit hole or perhaps inspires someone to figure out how to truly suppress these messages!


回答 2

警告很烦人。如其他答案所述,您可以使用以下方法抑制它们:

import warnings
warnings.simplefilter(action='ignore', category=FutureWarning)

但是,如果要一一处理它们,并且要管理更大的代码库,将很难找到引起警告的代码行。由于警告与错误不同,因此代码回溯不会附带警告。为了跟踪类似错误的警告,您可以在代码顶部编写以下代码:

import warnings
warnings.filterwarnings("error")

但是,如果代码库更大,并且正在导入一堆其他库/程序包,则各种警告将开始作为错误发出。为了仅将某些类型的警告(在您的情况下为FutureWarning)引发为错误,您可以编写:

import warnings
warnings.simplefilter(action='error', category=FutureWarning)

Warnings are annoying. As mentioned in other answers, you can suppress them using:

import warnings
warnings.simplefilter(action='ignore', category=FutureWarning)

But if you want to handle them one by one and you are managing a bigger codebase, it will be difficult to find the line of code which is causing the warning. Since warnings unlike errors don’t come with code traceback. In order to trace warnings like errors, you can write this at the top of the code:

import warnings
warnings.filterwarnings("error")

But if the codebase is bigger and it is importing bunch of other libraries/packages, then all sort of warnings will start to be raised as errors. In order to raise only certain type of warnings (in your case, its FutureWarning) as error, you can write:

import warnings
warnings.simplefilter(action='error', category=FutureWarning)

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