freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/69e2383af7832c8032603b93.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
69e2383af7832c8032603b93	Challenge 277: Mirror Image	29	challenge-277

--description--

Given two strings, determine if the second string is a mirror image of the first.

A mirror image is formed by reversing the string and replacing each character with its mirror equivalent.

• Symmetric characters look like themselves in a mirror:

W, T, Y, U, I, O, H, A, X, V, M, w, o, x, v, 0, 8, =, +, :, |, -, _, *, ^, !, ., and the space ( ).

• Mirrored pairs swap with each other in a mirror:

Character	Swaps with
[	]
{	}
<	>
b	d
p	q
(	)

If either string includes a character not in the lists above, it doesn't have mirror image that can be created from the characters.

For example, the mirrored image of "[HOW]" is "[WOH]".

--hints--

is_mirror_image("[HOW]", "[WOH]") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("[HOW]", "[WOH]"), True)`)
}})

is_mirror_image("MOM", "MOM") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("MOM", "MOM"), True)`)
}})

is_mirror_image("vow", "wov") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("vow", "wov"), True)`)
}})

is_mirror_image("TIM", "TIM") should return False.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("TIM", "TIM"), False)`)
}})

is_mirror_image("{WOW}", "}WOW{") should return False.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("{WOW}", "}WOW{"), False)`)
}})

is_mirror_image("XXVII", "IIV%X") should return False.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("XXVII", "IIV%X"), False)`)
}})

is_mirror_image("><(((*>", "<*)))><") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("><(((*>", "<*)))><"), True)`)
}})

is_mirror_image("WTYUIOHAXVMwoxv08=+:|-_*^!.[]{}<>bdpq()", "()pqbd<>{}[].!^*_-|:+=80vxowMVXAHOIUYTW") should return True.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_mirror_image("WTYUIOHAXVMwoxv08=+:|-_*^!.[]{}<>bdpq()", "()pqbd<>{}[].!^*_-|:+=80vxowMVXAHOIUYTW"), True)`)
}})

--seed--

--seed-contents--

def is_mirror_image(s1, s2):

    return s1

--solutions--

def is_mirror_image(s1, s2):
    symmetric = set('WTYUIOHA XVMwoxv08=+:|-_*^!.')
    pairs = {'[': ']', ']': '[', '{': '}', '}': '{', '<': '>', '>': '<',
             'b': 'd', 'd': 'b', 'p': 'q', 'q': 'p', '(': ')', ')': '('}
    mirrored = []
    for c in reversed(s1):
        if c in symmetric:
            mirrored.append(c)
        elif c in pairs:
            mirrored.append(pairs[c])
        else:
            return False
    return ''.join(mirrored) == s2