How to check whether a sentence is correct (simple grammar check in Python)?

Question

How to check whether a sentence is valid in Python?

Examples:

I love Stackoverflow - Correct
I Stackoverflow love - Incorrect

Answer 1

I would suggest the language-tool-python. For example:

import language_tool_python
tool = language_tool_python.LanguageTool('en-US')

text = "Your the best but their are allso  good !"
matches = tool.check(text)
len(matches)

and we get:

4

We can have a look at the 4 issues that it found:

1st Issue:

matches[0]

And we get:

Match({'ruleId': 'YOUR_YOU_RE', 'message': 'Did you mean "You\'re"?', 'replacements': ["You're"], 'context': 'Your the best but their are allso  good !', 'offset': 0, 'errorLength': 4, 'category': 'TYPOS', 'ruleIssueType': 'misspelling'})

2nd Issue:

matches[1]

and we get:

Match({'ruleId': 'THEIR_IS', 'message': 'Did you mean "there"?', 'replacements': ['there'], 'context': 'Your the best but their are allso  good !', 'offset': 18, 'errorLength': 5, 'category': 'CONFUSED_WORDS', 'ruleIssueType': 'misspelling'})

3rd Issue: matches[2] and we get:

Match({'ruleId': 'MORFOLOGIK_RULE_EN_US', 'message': 'Possible spelling mistake found.', 'replacements': ['also', 'all so'], 'context': 'Your the best but their are allso  good !', 'offset': 28, 'errorLength': 5, 'category': 'TYPOS', 'ruleIssueType': 'misspelling'})

4th Issue:

matches[3]

and we get:

Match({'ruleId': 'WHITESPACE_RULE', 'message': 'Possible typo: you repeated a whitespace', 'replacements': [' '], 'context': 'Your the best but their are allso  good!', 'offset': 33, 'errorLength': 2, 'category': 'TYPOGRAPHY', 'ruleIssueType': 'whitespace'})

If you are looking for a more detailed example you can have a look at the related post of Predictive Hacks