Python - What is the most efficient way to generate padding?

bytes += "\0"*len_diff

should help

Couldn't you just use ljust() to do the padding since we're dealing with string objects here?

bytes = f.read(self.chunksize)
if bytes:
    bytes = bytes.ljust(self.chunksize, '\0')

try this.

bytes = "\0" * self.chunksize
rbytes = f.read(self.chunksize)
bytes[:len(rbytes)] = rbytes

bytes = f.read(self.chunksize)
bytes += "\0" * (self.chunksize - len(bytes))

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