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+# Hamming
+
+Welcome to Hamming on Exercism's Python Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+Your body is made up of cells that contain DNA.
+Those cells regularly wear out and need replacing, which they achieve by dividing into daughter cells.
+In fact, the average human body experiences about 10 quadrillion cell divisions in a lifetime!
+
+When cells divide, their DNA replicates too.
+Sometimes during this process mistakes happen and single pieces of DNA get encoded with the incorrect information.
+If we compare two strands of DNA and count the differences between them, we can see how many mistakes occurred.
+This is known as the "Hamming distance".
+
+The Hamming distance is useful in many areas of science, not just biology, so it's a nice phrase to be familiar with :)
+
+## Instructions
+
+Calculate the Hamming distance between two DNA strands.
+
+We read DNA using the letters C, A, G and T.
+Two strands might look like this:
+
+    GAGCCTACTAACGGGAT
+    CATCGTAATGACGGCCT
+    ^ ^ ^  ^ ^    ^^
+
+They have 7 differences, and therefore the Hamming distance is 7.
+
+## Implementation notes
+
+The Hamming distance is only defined for sequences of equal length, so an attempt to calculate it between sequences of different lengths should not work.
+
+## Exception messages
+
+Sometimes it is necessary to [raise an exception](https://docs.python.org/3/tutorial/errors.html#raising-exceptions). When you do this, you should always include a **meaningful error message** to indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. For situations where you know that the error source will be a certain type, you can choose to raise one of the [built in error types](https://docs.python.org/3/library/exceptions.html#base-classes), but should still include a meaningful message.
+
+This particular exercise requires that you use the [raise statement](https://docs.python.org/3/reference/simple_stmts.html#the-raise-statement) to "throw" a `ValueError` when the strands being checked are not the same length. The tests will only pass if you both `raise` the `exception` and include a message with it.
+
+To raise a `ValueError` with a message, write the message as an argument to the `exception` type:
+
+```python
+# When the sequences being passed are not the same length.
+raise ValueError("Strands must be of equal length.")
+```
+
+## Source
+
+### Created by
+
+- @betegelse
+
+### Contributed to by
+
+- @behrtam
+- @cmccandless
+- @Dog
+- @gabriel376
+- @GascaK
+- @guaneec
+- @iandexter
+- @ikhadykin
+- @kytrinyx
+- @N-Parsons
+- @parthsharma2
+- @pheanex
+- @pywkm
+- @sjakobi
+- @tqa236
+- @yawpitch
+
+### Based on
+
+The Calculating Point Mutations problem at Rosalind - https://rosalind.info/problems/hamm/