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pyLanguagetool
LanguageTool is an open source proofreading (spellchecking and grammar checking) service for many languages including English and German which can be run as a server providing an JSON API.
pyLanguagetool is an Python library and command line interface for LanguageTool
How to use
pyLanguagetool can be installed from pip.
$ pip install pylanguagetool
Then pyLanguagetool can check text froum various sources and supports HTML, Markdown, reStructuredText and python notebooks:
$ echo "This is a example" | pylanguagetool
$ pylanguagetool textfile.txt
$ pylanguagetool < textfile.txt
$ pylanguagetool -c # get text from system clipboard
More information can be found on the website of the project: pylanguagetool.lw1.at