Simple byte frequency count

gistfile1.numpy

#!/usr/bin/python3

import numpy
import sys


def analyse(fd):
	result = numpy.zeros(256, dtype=numpy.uint32)
	while True:
		data = fd.read(4096)
		if len(data) == 0:
			break
		for c in data:
			result[c] += 1

	return result

if __name__ == "__main__":
	if len(sys.argv) != 2:
		print("Usage: " + sys.argv[0] + " <file>", file=sys.stderr)
		sys.exit(1)

	with open(sys.argv[1], "rb") as fd:
		result = analyse(fd)
	for r in result:
		print(r)