Pylint is a popular static code checker which can effectively find the possible bugs in your source code. It is easy to install pylint with conda or pip:
conda install pylint
# pip install pylintThe pylint configuration file is named .pylintrc which controls its
behaviors. Pylint will try to read the configuration from default locations.
The locations of the configuration file vary from system to system:
~/.pylintrc%userprofile%\.pylintrc (%userprofile% is a system variable. You
can use echo %userprofile% to show its value.)You can disable certain warnings and errors in the configuration file, which will apply globally for every Python source file you check.
For Python packages which are partly written in C/CPP, such as Numpy and
PyTorch, pylint may not be able to find the relevant method for an object. You
can set up in [TYPECHECK] section of .pylintrc to disable warning about
unfound method for Numpy and PyTorch:
[TYPECHECK]
# List of members which are set dynamically and missed by pylint inference
# system, and so shouldn't trigger E1101 when accessed. Python regular
# expressions are accepted.
generated-members=numpy.*,torch.*If you only want to disable a certain warning or error for a specific line. You
can add #pylint: disable=some-message,another-message in the end of the line.
For example:
sys.path.insert(0, '..')
import mymodule #pylint: disable=import-errorYou can also use the warning or error code instead of the actual message:
sys.path.insert(0, '..')
import mymodule #pylint: disable=E0401If you want to disable a certain warning or error for a particular file, you
can add #pylint: disable=some-message at the top of the file.
To disable a certain warning, we want to know its message id. On the command line, use the following command:
pylint --list-msgs |grep messageFor example, to find the message id of unnecessary-comprehension, we can use:
pylint --list-msgs|grep unnecessary-comprehensionWe may also find the message id from pylint doc.
To use pylint inside Neovim, you need to install a linting plugin. Neomake is a good choice. The minimum configuration for Neomake is:
" when to activate neomake
call neomake#configure#automake('nrw', 50)
" which linter to enable for Python source file linting
let g:neomake_python_enabled_makers = ['pylint']Neomake will automatically run pylint for currently edited file and show
warning and error symbols in sign column. You can also use :lopen to open the
location list window to see all the warnings and errors. To navigate the
location list, use :lprevious and :lnext to go to the previous and next
item on the list respectively.
When we lint our Python code with Neomake (using Pylint), it is often the case that our code can not pass the checker 100%. A lot of warnings and errors may occur, e.g., no docstring for method, variable names not conforming to standard. For some warnings, we do not want them to occur. How to ignore these warnings?
For example, if we want to ignore
invalid-name(corresponding
code is C0103) and
missing-docstring（
corresponding code C0111），we can use two methods.
The first way is to configure through Nvim configuration file. Add the following settings to your Nvim configuration:
let g:neomake_python_pylint_maker = {
\ 'args': [
\ '-d', 'C0103, C0111',
\ '-f', 'text',
\ '--msg-template="{path}:{line}:{column}:{C}: [{symbol}] {msg}"',
\ '-r', 'n'
\ ],
\ 'errorformat':
\ '%A%f:%l:%c:%t: %m,' .
\ '%A%f:%l: %m,' .
\ '%A%f:(%l): %m,' .
\ '%-Z%p^%.%#,' .
\ '%-G%.%#',
\ }
let g:neomake_python_enabled_makers = ['flake8', 'pylint']Find the code corresponding to a warning and paste it in the string after -d
options. Separate different warning codes with ,.
.pylintrc#The second way is to create a .pylintrc file and ignore certain warning in
this file. First, we need to generate .pylintrc under the home directory:
pylint --disable=invalid-namae,missing-docstring --generate-rcfile > ~/.pylintrcIf you want to ignore new warnings, you just need to edit .pylintrc, find the
part starting with disable= and add the new warnings to the long list of
existing warnings. The format should conform to the existing format in the
.pylintrc file.
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