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Update specs/simple-serialize.md 

Co-Authored-By: vbuterin <v@buterin.com>
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Hsiao-Wei Wang 2019-01-31 17:49:51 -06:00 committed by GitHub
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@ -385,7 +385,7 @@ Return the hash of the serialization of the value.
#### List/Vectors
First, we define some helpers and then the Merkle tree function. `zpad(input: bytes, length: int) -> bytes` is a helper that extends the given `bytes` value to the desired `length` by adding zero bytes on the right.
First, we define some helpers and then the Merkle tree function. `def zpad(input: bytes, length: int) -> bytes: return input + b'\x00' * (length - len(input))` is a helper that extends the given `bytes` value to the desired `length` by adding zero bytes on the right.
```python
# Merkle tree hash of a list of homogenous, non-empty items