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Calculate statistical features from text

Project description


Python package to calculate statistics from text to determine readability, complexity and grade level of a particular corpus.

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>>> import textstat

>>> test_data = (
    "Playing games has always been thought to be important to "
    "the development of well-balanced and creative children; "
    "however, what part, if any, they should play in the lives "
    "of adults has never been researched that deeply. I believe "
    "that playing games is every bit as important for adults "
    "as for children. Not only is taking time out to play games "
    "with our children and other adults valuable to building "
    "interpersonal relationships but is also a wonderful way "
    "to release built up tension."

>>> textstat.flesch_reading_ease(test_data)
>>> textstat.smog_index(test_data)
>>> textstat.flesch_kincaid_grade(test_data)
>>> textstat.coleman_liau_index(test_data)
>>> textstat.automated_readability_index(test_data)
>>> textstat.dale_chall_readability_score(test_data)
>>> textstat.difficult_words(test_data)
>>> textstat.linsear_write_formula(test_data)
>>> textstat.gunning_fog(test_data)
>>> textstat.text_standard(test_data)

The argument (text) for all the defined functions remains the same - i.e the text for which statistics need to be calculated.


You can install textstat either via the Python Package Index (PyPI) or from source.

Install using pip

pip install textstat

Install using easy_install

easy_install textstat

Install lastest version from GitHub

git clone
cd textstat
pip install .

Install from PyPI

Download the latest version of textstat from

You can install it by doing the following:

tar xfz textstat-*.tar.gz
cd textstat-*/
python build
python install # as root

Language support

By default functions implement algorithms for english language. To change language, use:


The language will be used for syllable calculation and to choose variant of the formula.

Language variants

All functions implement en_US language. Some of them has also variants for other languages listed below.

Function en de es fr it nl pl ru

List of Functions

Syllable Count


Returns the number of syllables present in the given text.

Uses the Python module Pyphen for syllable calculation.

Lexicon Count

textstat.lexicon_count(text, removepunct=True)

Calculates the number of words present in the text. Optional removepunct specifies whether we need to take punctuation symbols into account while counting lexicons. Default value is True, which removes the punctuation before counting lexicon items.

Sentence Count


Returns the number of sentences present in the given text.

The Flesch Reading Ease formula


Returns the Flesch Reading Ease Score.

The following table can be helpful to assess the ease of readability in a document.

The table is an example of values. While the maximum score is 121.22, there is no limit on how low the score can be. A negative score is valid.

Score Difficulty
90-100 Very Easy
80-89 Easy
70-79 Fairly Easy
60-69 Standard
50-59 Fairly Difficult
30-49 Difficult
0-29 Very Confusing

Further reading on Wikipedia

The Flesch-Kincaid Grade Level


Returns the Flesch-Kincaid Grade of the given text. This is a grade formula in that a score of 9.3 means that a ninth grader would be able to read the document.

Further reading on Wikipedia

The Fog Scale (Gunning FOG Formula)


Returns the FOG index of the given text. This is a grade formula in that a score of 9.3 means that a ninth grader would be able to read the document.

Further reading on Wikipedia

The SMOG Index


Returns the SMOG index of the given text. This is a grade formula in that a score of 9.3 means that a ninth grader would be able to read the document.

Texts of fewer than 30 sentences are statistically invalid, because the SMOG formula was normed on 30-sentence samples. textstat requires atleast 3 sentences for a result.

Further reading on Wikipedia

Automated Readability Index


Returns the ARI (Automated Readability Index) which outputs a number that approximates the grade level needed to comprehend the text.

For example if the ARI is 6.5, then the grade level to comprehend the text is 6th to 7th grade.

Further reading on Wikipedia

The Coleman-Liau Index


Returns the grade level of the text using the Coleman-Liau Formula. This is a grade formula in that a score of 9.3 means that a ninth grader would be able to read the document.

Further reading on Wikipedia

Linsear Write Formula


Returns the grade level using the Linsear Write Formula. This is a grade formula in that a score of 9.3 means that a ninth grader would be able to read the document.

Further reading on Wikipedia

Dale-Chall Readability Score


Different from other tests, since it uses a lookup table of the most commonly used 3000 English words. Thus it returns the grade level using the New Dale-Chall Formula.

Score Understood by
4.9 or lower average 4th-grade student or lower
5.0–5.9 average 5th or 6th-grade student
6.0–6.9 average 7th or 8th-grade student
7.0–7.9 average 9th or 10th-grade student
8.0–8.9 average 11th or 12th-grade student
9.0–9.9 average 13th to 15th-grade (college) student

Further reading on Wikipedia

Readability Consensus based upon all the above tests

textstat.text_standard(text, float_output=False)

Based upon all the above tests, returns the estimated school grade level required to understand the text.

Optional float_output allows the score to be returned as a float. Defaults to False.


If you find any problems, you should open an issue.

If you can fix an issue you've found, or another issue, you should open a pull request.

  1. Fork this repository on GitHub to start making your changes to the master branch (or branch off of it).
  2. Write a test which shows that the bug was fixed or that the feature works as expected.
  3. Send a pull request!

Development setup

It is recommended you use a virtual environment, or Pipenv to keep your development work isolated from your systems Python installation.

$ git clone<yourname>/textstat.git  # Clone the repo from your fork
$ cd textstat
$ pip install -r requirements.txt  # Install all dependencies

$ # Make changes

$ python -m pytest  # Run tests

Project details

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