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73 lines
1.6 KiB
Markdown
73 lines
1.6 KiB
Markdown
---
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id: 68d30845cc08266018fc46bc
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title: "Challenge 76: Complementary DNA"
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challengeType: 29
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dashedName: challenge-76
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---
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# --description--
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Given a string representing a DNA sequence, return its complementary strand using the following rules:
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- DNA consists of the letters `"A"`, `"C"`, `"G"`, and `"T"`.
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- The letters `"A"` and `"T"` complement each other.
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- The letters `"C"` and `"G"` complement each other.
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For example, given `"ACGT"`, return `"TGCA"`.
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# --hints--
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`complementary_dna("ACGT")` should return `"TGCA"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(complementary_dna("ACGT"), "TGCA")`)
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}})
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```
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`complementary_dna("ATGCGTACGTTAGC")` should return `"TACGCATGCAATCG"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(complementary_dna("ATGCGTACGTTAGC"), "TACGCATGCAATCG")`)
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}})
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```
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`complementary_dna("GGCTTACGATCGAAG")` should return `"CCGAATGCTAGCTTC"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(complementary_dna("GGCTTACGATCGAAG"), "CCGAATGCTAGCTTC")`)
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}})
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```
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`complementary_dna("GATCTAGCTAGGCTAGCTAG")` should return `"CTAGATCGATCCGATCGATC"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(complementary_dna("GATCTAGCTAGGCTAGCTAG"), "CTAGATCGATCCGATCGATC")`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def complementary_dna(strand):
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return strand
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```
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# --solutions--
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```py
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def complementary_dna(strand):
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complements = { "A": "T", "T": "A", "C": "G", "G": "C" }
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return "".join(complements[n] for n in strand)
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```
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