Converting Snake Case to Lower Camel Case (lowerCamelCase)

Answer #1:

def to_camel_case(snake_str):
    components = snake_str.split('_')
    # We capitalize the first letter of each component except the first one
    # with the 'title' method and join them together.
    return components[0] + ''.join(x.title() for x in components[1:])

Example:

In [11]: to_camel_case('snake_case')
Out[11]: 'snakeCase'

Answer #2:

Here’s yet another take, which works only in Python 3.5 and higher:

def camel(snake_str):
    first, *others = snake_str.split('_')
    return ''.join([first.lower(), *map(str.title, others)])

Answer #3:

Obligatory one-liner:

import string

def to_camel_case(s):
    return s[0].lower() + string.capwords(s, sep='_').replace('_', '')[1:] if s else s

Answer #4:

>>> snake_case = "this_is_a_snake_case_string"
>>> l = snake_case.split("_")
>>> print l[0] + "".join(map(str.capitalize, l[1:]))
'thisIsASnakeCaseString'

Answer #5:

another one liner

def to_camel_case(snake_string):
    return snake_string.title().replace("_", "")

Answer #6:

A little late to this, but I found this on /r/python a couple days ago:

pip install pyhumps

and then you can just do:

import humps

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

Answer #7:

Building on Steve’s answer, this version should work:

def to_camel_case(snake_case_string):
    titleCaseVersion =  snake_case_string.title().replace("_", "")
    camelCaseVersion = titleCaseVersion[0].lower() + titleCaseVersion[1:]
    return camelCaseVersion

Answer #8:

Here is a solution using regular expressions:

import re

def snake_to_camel(text):
    return re.sub('_([a-zA-Z0-9])', lambda m: m.group(1).upper(), text)