Python: String to CamelCase

Question

This is a question from Codewars:
Complete the method/function so that it converts dash/underscore delimited words into camel casing. The first word within the output should be capitalized only if the original word was capitalized (known as Upper Camel Case, also often referred to as Pascal case).

The input test cases are as follows:

test.describe("Testing function to_camel_case")
test.it("Basic tests")
test.assert_equals(to_camel_case(''), '', "An empty string was provided but not returned")
test.assert_equals(to_camel_case("the_stealth_warrior"), "theStealthWarrior", "to_camel_case('the_stealth_warrior') did not return correct value")
test.assert_equals(to_camel_case("The-Stealth-Warrior"), "TheStealthWarrior", "to_camel_case('The-Stealth-Warrior') did not return correct value")
test.assert_equals(to_camel_case("A-B-C"), "ABC", "to_camel_case('A-B-C') did not return correct value")

This is what I’ve tried so far:

def to_camel_case(text):
    str=text
    str=str.replace(' ','')
    for i in str:
        if ( str[i] == '-'):
            str[i]=str.replace('-','')
            str[i+1].toUpperCase()
        elif ( str[i] == '_'):
            str[i]=str.replace('-','')
            str[i+1].toUpperCase()
    return str

It passes the first two tests but not the main ones :

 test.assert_equals(to_camel_case("the_stealth_warrior"), "theStealthWarrior", "to_camel_case('the_stealth_warrior') did not return correct value")
    test.assert_equals(to_camel_case("The-Stealth-Warrior"), "TheStealthWarrior", "to_camel_case('The-Stealth-Warrior') did not return correct value")
    test.assert_equals(to_camel_case("A-B-C"), "ABC", "to_camel_case('A-B-C') did not return correct value")

What am I doing wrong?

Asked By: Devarshi Goswami

||

Source

Answer 1

You may have a working implementation with slight errors as mentioned in your comments, but I propose that you:

split by the delimiters
apply a capitalization for all but the first of the tokens
rejoin the tokens

My implementation is:

def to_camel_case(text):
    s = text.replace("-", " ").replace("_", " ")
    s = s.split()
    if len(text) == 0:
        return text
    return s[0] + ''.join(i.capitalize() for i in s[1:])

IMO it makes a bit more sense.
The output from running tests is:

>>> to_camel_case("the_stealth_warrior")
'theStealthWarrior'
>>> to_camel_case("The-Stealth-Warrior")
'TheStealthWarrior'
>>> to_camel_case("A-B-C")
'ABC'

Answered By: JoshDaBosh

Answer 2

I think first of you should change the syntax a little because ‘i’ is a string not an integer. It should be

for i in str:
    if (i == '-'):
    ...

Answered By: AkalaMangala

Answer 3

from re import sub

def to_camelcase(s):
  s = sub(r"(_|-)+", " ", s).title().replace(" ", "").replace("*","")
  return ''.join([s[0].lower(), s[1:]])

print(to_camelcase('some_string_with_underscore'))
print(to_camelcase('Some string with Spaces'))
print(to_camelcase('some-string-with-dashes'))
print(to_camelcase('some string-with dashes_underscores and spaces'))
print(to_camelcase('some*string*with*asterisks'))

Answered By: minTwin

Answer 4

this is my simple way

def to_camel_case(text):
    #your code herdlfldfde
    s = text.replace("-", " ").replace("_", " ")
    s = s.split()
    if len(text) == 0:
     return text
   return s[0] + ' '.join(s[1:]).title().replace(" ", "")

Answered By: Joshua mbavazi

Answer 5

Potential solution/package that supports pascal/snake conversion to camel.

# pip install camelCasing
from camelCasing import camelCasing as cc

for s in ['the_stealth_warrior', 'The-Stealth-Warrior', 'A-B-C']:
    print(cc.toCamelCase(s=s, user_acronyms=None))

theStealthWarrior
theStealthWarrior
ABC

Answered By: John Stud

Python: String to CamelCase

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