Python格式警告和交叉包装错误 [英] Python formatWarning and cross-package errors

问题描述

好的，我很困惑.我正在使用两个Python软件包-PyPDF2和SQLAlchemy. SQLAlchemy使用python的warning.warn()发出警告，并以某种方式调用PyPDF2中的formatWarning()函数，该函数也使用python的warning.warn().

Okay, I am confused. I am using two Python packages - PyPDF2 and SQLAlchemy. SQLAlchemy is raising a warning using python's warning.warn(), and somehow calling a formatWarning() function in PyPDF2, which also uses python's warning.warn().

这是SQLAlchemy或PyPDF2中的错误吗?

Is this an error in SQLAlchemy or PyPDF2?

这甚至是怎么发生的-formatWarning有一些特殊功能吗?

How does this even happen - is formatWarning some special function?

PyPDF2将其定义为:

PyPDF2 defines it as:

#custom implementation of warnings.formatwarning
def formatWarning(message, category, filename, lineno, line=None):
    file = filename.replace("/", "\\").rsplit("\\", 1)[1] # find the file name
    return "%s: %s [%s:%s]\n" % (category.__name__, message, file, lineno)

我的错误堆栈是-

  File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/orm/strategies.py", line 613, in _emit_lazyload
    % self.parent_property)

  File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.9.7-py2.7-linux-x86_64.egg/sqlalchemy/util/langhelpers.py", line 1205, in warn
    warnings.warn(msg, exc.SAWarning, stacklevel=stacklevel)

  File "/usr/local/lib/python2.7/dist-packages/PyPDF2/pdf.py", line 817, in _showwarning
    file.write(formatWarning(message, category, filename, lineno, line))

  File "/usr/local/lib/python2.7/dist-packages/PyPDF2/utils.py", line 59, in formatWarning
    file = filename.replace("/", "\\").rsplit("\\", 1)[1] # find the file name

  IndexError: list index out of range

推荐答案

看来这是PyPDF2包中的旧错误，它覆盖了python utils._formatwarning:

It appears this was an old error in the package PyPDF2, where it was overwriting python utils._formatwarning:

warnings.formatwarning = utils._formatwarning

最新版本似乎已解决此问题，将其更新至最新版本以解决此问题.

Recent releases appear to have fixed this, updating to the latest fixed the issue.

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