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🐫 Convert strings (and dictionary keys) between snake case, camel case and pascal case in Python. Inspired by Humps for Node

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Convert strings (and dictionary keys) between snake case, camel case and pascal case in Python. Inspired by Humps for Node.


When creating an API, the authors will often use the character casing convention that is idiomatic to their backend language, thus forcing consumers developing in a different language (with different style guidelines) to tolerate inconsistent casing styles, hardcode mappings between the two, or lug around some case conversion utility functions.

While none of these are inherently wrong, it would still be nice to have a dependable solution just a few keystrokes away.


To install humps, simply use pipenv (or pip, of course):

$ pipenv install pyhumps


Converting strings

import humps

humps.camelize('jack_in_the_box')  # jackInTheBox
humps.decamelize('rubyTuesdays')  # ruby_tuesdays
humps.pascalize('red_robin')  # RedRobin

Converting dictionary keys

import humps

array = [{'attrOne': 'foo'}, {'attrOne': 'bar'}]
humps.decamelize(array) # [{'attr_one': 'foo'}, {'attr_one': 'bar'}]

array = [{'attr_one': 'foo'}, {'attr_one': 'bar'}]
humps.camelize(array)  # [{'attrOne': 'foo'}, {'attrOne': 'bar'}]

array = [{'attr_one': 'foo'}, {'attr_one': 'bar'}]
humps.pascalize(array)  # [{'AttrOne': 'foo'}, {'AttrOne': 'bar'}]

Checking character casing

import humps

humps.is_camelcase('illWearYourGranddadsClothes')  # True
humps.is_pascalcase('ILookIncredible')  # True
humps.is_snakecase('im_in_this_big_ass_coat')  # True
humps.is_camelcase('from_that_thrift_shop')  # False
humps.is_snakecase('downTheRoad')  # False

How personally I use humps

Pythonic Boto3 API Wrapper

import humps
import boto3

def api(service, decamelize=True, *args, **kwargs):
    service, func = service.split(':')
    client = boto3.client(service)
    kwargs = humps.pascalize(kwargs)
    response = getattr(client, func)(*args, **kwargs)
    return (depascalize(response) if decamelize else response)

api('s3:download_file', bucket='bucket', key='hello.png', filename='hello.png')

Flask-RESTful Adaptive Responses

# I will post a code snippet for this soon. It's a decorator that checks if
# the request arguments were passed as camelcase or snake_case, it then
# rewrites the response to match the consumer's preferred casing style.

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