codespell  2.1.0
About: codespell checks source code and other text files for common misspellings.
  Fossies Dox: codespell-2.1.0.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

codespell Documentation

Some Fossies usage hints in advance:

  1. To see the Doxygen generated documentation please click on one of the items in the steelblue colored "quick index" bar above or use the side panel at the left which displays a hierarchical tree-like index structure and is adjustable in width.
  2. If you want to search for something by keyword rather than browse for it you can use the client side search facility (using Javascript and DHTML) that provides live searching, i.e. the search results are presented and adapted as you type in the Search input field at the top right.
  3. Doxygen doesn't incorporate all member files but just a definable subset (basically the main project source code files that are written in a supported language). So to search and browse all member files you may visit the Fossies codespell-2.1.0.tar.gz contents page and use the Fossies standard member browsing features (also with source code highlighting and additionally with optional code folding).


Fix common misspellings in text files. It's designed primarily for checking misspelled words in source code, but it can be used with other files as well.


Python 3.5 or above.


You can use pip to install codespell with e.g.:

pip install codespell


For more in depth info please check usage with codespell -h.

Some noteworthy flags:

codespell -w, --write-changes

The -w flag will actually implement the changes recommended by codespell. Not running with -w flag is the same as with doing a dry run. It is recommended to run this with the -i or --interactive flag.:

codespell -I FILE, --ignore-words=FILE

The -I flag can be used for a list of certain words to allow that are in the codespell dictionaries. The format of the file is one word per line. Invoke using: codespell -I path/to/file.txt to execute codespell referencing said list of allowed words. Important note: The list passed to -I is case-sensitive based on how it is listed in the codespell dictionaries. :

codespell -L word1,word2,word3,word4

The -L flag can be used to allow certain words that are comma-separated placed immediately after it. Important note: The list passed to -L is case-sensitive based on how it is listed in the codespell dictionaries. :

codespell -S, --skip=

Comma-separated list of files to skip. It accepts globs as well. Examples:

  • to skip .eps & .txt files, invoke codespell --skip="*.eps,*.txt"
  • to skip directories, invoke codespell --skip="./src/3rd-Party,./src/Test"

Useful commands:

codespell -d -q 3 --skip="*.po,*.ts,./src/3rdParty,./src/Test"

List all typos found except translation files and some directories. Display them without terminal colors and with a quiet level of 3. :

codespell -i 3 -w

Run interactive mode level 3 and write changes to file.

We ship a collection of dictionaries that are an improved version of the one available on Wikipedia after applying them in projects like Linux Kernel, EFL, oFono among others. You can provide your own version of the dictionary, but patches for new/different entries are very welcome.

Want to know if a word you're proposing exists in codespell already? It is possible to test a word against the current set dictionaries that exist in codespell_lib/data/dictionary*.txt via:

echo "word" | codespell -
echo "1stword,2ndword" | codespell -

You can select the optional dictionaries with the --builtin option.

Using a config file

Command line options can also be specified in a config file.

When running codespell, it will check in the current directory for a file named setup.cfg or .codespellrc (or a file specified via --config), containing an entry named [codespell]. Each command line argument can be specified in this file (without the preceding dashes), for example:

skip = *.po,*.ts,./src/3rdParty,./src/Test
count =
quiet-level = 3

This is equivalent to running:

codespell --quiet-level 3 --count --skip "*.po,*.ts,./src/3rdParty,./src/Test"

Any options specified in the command line will override options from the config file.

Dictionary format

The format of the dictionaries was influenced by the one they originally came from, i.e. from Wikipedia. The difference is how multiple options are treated and that the last argument is an optional reason why a certain entry could not be applied directly, but should instead be manually inspected. E.g.:

  1. Simple entry: one wrong word / one suggestion:

  2. Entry with more than one suggested fix:

    fiel->feel, field, file, phial,

    Note the last comma! You need to use it, otherwise the last suggestion will be discarded (see below for why). When there is more than one suggestion, an automatic fix is not possible and the best we can do is to give the user the file and line where the error occurred as well as the suggestions.

  3. Entry with one word, but with automatic fix disabled:

    clas->class, disabled because of name clash in c++

    Note that there isn't a comma at the end of the line. The last argument is treated as the reason why a suggestion cannot be automatically applied.

    There can also be multiple suggestions but any automatic fix will again be disabled:

    clas->class, clash, disabled because of name clash in c++

Development Setup

You can install required dependencies for development by running the following within a checkout of the codespell source:

pip install -e ".[dev]"

To run tests against the codebase run:

make check

Sending Pull Requests

If you have a suggested typo that you'd like to see merged please follow these steps:

  1. Make sure you read the instructions mentioned in the Dictionary format section above to submit correctly formatted entries.

  2. Choose the correct dictionary file to add your typo to. See codespell --help for explanations of the different dictionaries.

  3. Sort the dictionaries. This is done by invoking (in the top level directory of codespell/):

    make check-dictionaries

    If the make script finds that you need to sort a dictionary, please then run:

    make sort-dictionaries
  4. Only after this process is complete do we recommend you submit the PR.

Important Notes:

  • If the dictionaries are submitted without being pre-sorted the PR will fail via our various CI tools.
  • Not all PRs will be merged. This is pending on the discretion of the devs, maintainers, and the community.


To stay current with codespell developments it is possible to build codespell from GitHub via:

pip install --upgrade git+

Important Notes:

  • Sometimes installing via pip will complain about permissions. If this is the case then run with :

    pip install --user --upgrade git+
  • It has been reported that after installing from pip, codespell can't be located. Please check the $PATH variable to see if ~/.local/bin is present. If it isn't then add it to your path.

  • If you decide to install via pip then be sure to remove any previously installed versions of codespell (via your platform's preferred app manager).

Updating the dictionaries

In the scenario where the user prefers not to follow the development version of codespell yet still opts to benefit from the frequently updated dictionary files, we recommend running a simple set of commands to achieve this :

codespell -D dictionary.txt

The above simply downloads the latest dictionary.txt file and then by utilizing the -D flag allows the user to specify the freshly downloaded dictionary.txt as the custom dictionary instead of the default one.

You can also do the same thing for the other dictionaries listed here:


The Python script codespell with its library codespell_lib is available with the following terms: (tl;dr: GPL v2)

Copyright (C) 2010-2011 Lucas De Marchi <>

Copyright (C) 2011 ProFUSION embedded systems

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, see <>.

dictionary.txt and the other dictionary_*.txt files are a derived work of English Wikipedia and are released under the Creative Commons Attribution-Share-Alike License 3.0