Preprocessors

ChatterBot’s preprocessors are simple functions that modify the input statement that a chat bot receives before the statement gets processed by the logic adaper.

Here is an example of how to set preprocessors. The preprocessors parameter should be a list of strings of the import paths to your preprocessors.

chatbot = ChatBot(
    'Bob the Bot',
    preprocessors=[
        'chatterbot.preprocessors.clean_whitespace'
    ]
)

Preprocessor functions

ChatterBot comes with several built-in preprocessors.

chatterbot.preprocessors.clean_whitespace(statement)

Remove any consecutive whitespace characters from the statement text.

chatterbot.preprocessors.unescape_html(statement)

Convert escaped html characters into unescaped html characters. For example: “&lt;b&gt;” becomes “<b>”.

chatterbot.preprocessors.convert_to_ascii(statement)

Converts unicode characters to ASCII character equivalents. For example: “på fédéral” becomes “pa federal”.

Creating new preprocessors

It is simple to create your own preprocessors. A preprocessor is just a function with a few requirements.

1. It must take one parameter, a Statement instance.

2. It must return a statement instance.

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