freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/69e2383af7832c8032603b8e.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
69e2383af7832c8032603b8e	Challenge 272: Transposed Matrix	29	challenge-272

--description--

Given a matrix (an array of arrays), return the transposed version of it.

To transpose the matrix, swap the rows and columns. E.g: a value at index [0, 1] should move to index [1, 0].

For example, given:

[
  [1, 2, 3],
  [4, 5, 6]
]

Return:

[
  [1, 4],
  [2, 5],
  [3, 6]
]

--hints--

transpose([[1, 2, 3], [4, 5, 6]]) should return [[1, 4], [2, 5], [3, 6]].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(transpose([[1, 2, 3], [4, 5, 6]]), [[1, 4], [2, 5], [3, 6]])`)
}})

transpose([[1, 2], [3, 4], [5, 6]]) should return [[1, 3, 5], [2, 4, 6]].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(transpose([[1, 2], [3, 4], [5, 6]]), [[1, 3, 5], [2, 4, 6]])`)
}})

transpose([[1, 2], [3, 4], [5, 6], [7, 8]]) should return [[1, 3, 5, 7], [2, 4, 6, 8]].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(transpose([[1, 2], [3, 4], [5, 6], [7, 8]]), [[1, 3, 5, 7], [2, 4, 6, 8]])`)
}})

transpose([["a", "b", "c"], ["d", "e", "f"], ["g", "h", "i"], ["j", "k", "l"]]) should return [["a", "d", "g", "j"], ["b", "e", "h", "k"], ["c", "f", "i", "l"]].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(transpose([["a", "b", "c"], ["d", "e", "f"], ["g", "h", "i"], ["j", "k", "l"]]), [["a", "d", "g", "j"], ["b", "e", "h", "k"], ["c", "f", "i", "l"]])`)
}})

transpose([[True, False, True, False], [False, True, False, True], [True, True, False, False], [False, False, True, True], [True, False, False, True]]) should return [[True, False, True, False, True], [False, True, True, False, False], [True, False, False, True, False], [False, True, False, True, True]].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(transpose([[True, False, True, False], [False, True, False, True], [True, True, False, False], [False, False, True, True], [True, False, False, True]]), [[True, False, True, False, True], [False, True, True, False, False], [True, False, False, True, False], [False, True, False, True, True]])`)
}})

--seed--

--seed-contents--

def transpose(matrix):

    return matrix

--solutions--

def transpose(matrix):
    return [[row[i] for row in matrix] for i in range(len(matrix[0]))]