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Pylint output
-------------
The default format for the output is raw text. You can change this by passing
pylint the ``--output-format=<value>`` option. Possible values are: json,
parseable, colorized and msvs (visual studio).
Multiple output formats can be used at the same time by passing
``--output-format`` a comma-separated list of formats. To change the output file
for an individual format, specify it after a semicolon. For example, you can
save a json report to ``somefile`` and print a colorized report to stdout at the
same time with :
::
--output-format=json:somefile,colorized
Moreover you can customize the exact way information are displayed using the
`--msg-template=<format string>` option. The `format string` uses the
`Python new format syntax`_ and the following fields are available :
path
relative path to the file
abspath
absolute path to the file
line
line number
column
column number
module
module name
obj
object within the module (if any)
msg
text of the message
msg_id
the message code (eg. I0011)
symbol
symbolic name of the message (eg. locally-disabled)
C
one letter indication of the message category
category
fullname of the message category
For example, the former (pre 1.0) default format can be obtained with::
pylint --msg-template='{msg_id}:{line:3d},{column}: {obj}: {msg}'
A few other examples:
* the default format::
{path}:{line}:{column}: {msg_id}: {msg} ({symbol})
* Visual Studio compatible format (former 'msvs' output format)::
{path}({line}): [{msg_id}{obj}] {msg}
* Parseable (Emacs and all, former 'parseable' output format) format::
{path}:{line}: [{msg_id}({symbol}), {obj}] {msg}
The ``--msg-template`` option can only be combined with text-based reporters (``--output-format`` either unspecified or one of: parseable, colorized or msvs).
If both ``--output-format`` and ``--msg-template`` are specified, the ``--msg-template`` option will take precedence over the default line format defined by the reporter class.
.. _Python new format syntax: https://docs.python.org/2/library/string.html#formatstrings
Source code analysis section
''''''''''''''''''''''''''''
For each python module, Pylint will first display a few '*' characters followed
by the name of the module. Then, a number of messages with the following format:
::
MESSAGE_TYPE: LINE_NUM:[OBJECT:] MESSAGE
You can get another output format, useful since it's recognized by
most editors or other development tools using the ``--output-format=parseable``
option.
The message type can be:
* [I]nformational messages that Pylint emits (do not contribute to your analysis score)
* [R]efactor for a "good practice" metric violation
* [C]onvention for coding standard violation
* [W]arning for stylistic problems, or minor programming issues
* [E]rror for important programming issues (i.e. most probably bug)
* [F]atal for errors which prevented further processing
Sometimes the line of code which caused the error is displayed with
a caret pointing to the error. This may be generalized in future
versions of Pylint.
Example (extracted from a run of Pylint on itself...):
::
************* Module pylint.checkers.format
W: 50: Too long line (86/80)
W:108: Operator not followed by a space
print >>sys.stderr, 'Unable to match %r', line
^
W:141: Too long line (81/80)
W: 74:searchall: Unreachable code
W:171:FormatChecker.process_tokens: Redefining built-in (type)
W:150:FormatChecker.process_tokens: Too many local variables (20/15)
W:150:FormatChecker.process_tokens: Too many branches (13/12)
Reports section
'''''''''''''''
Following the analysis message, Pylint can display a set of reports,
each one focusing on a particular aspect of the project, such as number
of messages by categories, modules dependencies. These features can
be enabled through the ``--reports=y`` option, or its shorthand
version ``-rn``.
For instance, the metrics report displays summaries gathered from the
current run.
* the number of processed modules
* for each module, the percentage of errors and warnings
* the total number of errors and warnings
* percentage of classes, functions and modules with docstrings, and
a comparison from the previous run
* percentage of classes, functions and modules with correct name
(according to the coding standard), and a comparison from the
previous run
* a list of external dependencies found in the code, and where they appear
Score section
'''''''''''''
Finally, Pylint displays a global evaluation score for the code, rated out of a
maximum score of 10.0. This output can be suppressed through the ``--score=n``
option, or its shorthand version ``-sn``.
The evaluation formula can be overridden with the
``--evaluation=<python_expression>`` option.
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