freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/68e39ed6106dac2f0a98fd64.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
68e39ed6106dac2f0a98fd64	Challenge 82: SpOoKy~CaSe	29	challenge-82

--description--

Given a string representing a variable name, convert it to "spooky case" using the following constraints:

• Replace all underscores (_), and hyphens (-) with a tilde (~).
• Capitalize the first letter of the string, and every other letter after that. Ignore the tilde character when counting. Make all other letters lowercase.

For example, given hello_world, return HeLlO~wOrLd.

--hints--

spookify("hello_world") should return "HeLlO~wOrLd".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(spookify("hello_world"), "HeLlO~wOrLd")`)
}})

spookify("Spooky_Case") should return "SpOoKy~CaSe".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(spookify("Spooky_Case"), "SpOoKy~CaSe")`)
}})

spookify("TRICK-or-TREAT") should return "TrIcK~oR~tReAt".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(spookify("TRICK-or-TREAT"), "TrIcK~oR~tReAt")`)
}})

spookify("c_a-n_d-y_-b-o_w_l") should return "C~a~N~d~Y~~b~O~w~L".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(spookify("c_a-n_d-y_-b-o_w_l"), "C~a~N~d~Y~~b~O~w~L")`)
}})

spookify("thE_hAUntEd-hOUsE-Is-fUll_Of_ghOsts") should return "ThE~hAuNtEd~HoUsE~iS~fUlL~oF~gHoStS".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(spookify("thE_hAUntEd-hOUsE-Is-fUll_Of_ghOsts"), "ThE~hAuNtEd~HoUsE~iS~fUlL~oF~gHoStS")`)
}})

--seed--

--seed-contents--

def spookify(boo):

    return boo

--solutions--

def spookify(boo):
    replaced = boo.replace("_", "~").replace("-", "~")
    
    result = []
    capitalize = True

    for char in replaced:
        if char == "~":
            result.append(char)
        else:
            result.append(char.upper() if capitalize else char.lower())
            capitalize = not capitalize

    return "".join(result)