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Run-Length Encoding

Intermediate · Write the code · from 50 Python Practice Problems with Instant Answer Checking (Beginner to Advanced)

From the lesson: 50 Python Practice Problems with Instant Answer Checking (Beginner to Advanced)

Fifty problems, each with a code editor and real tests. Write your solution, press Check, and see exactly which cases pass. Stuck? Hints reveal one at a time, and the solution unlocks once you have checked at least once. Your code and progress are saved in this browser.

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Write rle(text) that compresses runs of the same character into the character followed by its count.

rle("aaabccdddd")  ->  "a3b1c2d4"
def rle(text):
pass
Solution unlocks after your first Check

What Check runs

Your code runs first, then each of these lines. The output must match exactly.

RunsExpected output
rle("aaabccdddd")'a3b1c2d4'
rle("abc")'a1b1c1'

More practice problems

All Python exercises · 50 practice problems