| t d | j D S )ziReturn all unique error codes stored.
:returns:
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r s r error_codeszStatistics.error_codes s# 774;777888r errorr c t | }|| j vr"t | | j |< | j | dS )zAdd the fact that the error was seen in the file.
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Statistic increment)r r r s r recordzStatistics.record s[ ooe$$ dk ! ! ( 4 4U ; ;DK C""$$$$$r prefixfilename)r! NNc # x K t fd| j D }|D ]}| j | V dS )aB Generate statistics for the prefix and filename.
If you have a :class:`Statistics` object that has recorded errors,
you can generate the statistics for a prefix (e.g., ``E``, ``E1``,
``W50``, ``W503``) with the optional filter of a filename as well.
.. code-block:: python
>>> stats = Statistics()
>>> stats.statistics_for('E12',
filename='src/flake8/statistics.py')
>>> stats.statistics_for('W')
:param prefix:
The error class or specific error code to find statistics for.
:param filename:
(Optional) The filename to further filter results by.
:returns:
Generator of instances of :class:`Statistic`
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