#!/usr/bin/env python
# Copyright 2018 Scott Wales
# author: Scott Wales <scott.wales@unimelb.edu.au>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function


def size_str(size):
    from math import log, floor
    if size > 0:
        r = int(floor(log(size, 1000)))
    else:
        r = 0

    prefix = [' ', 'k', 'M', 'G', 'T']
    return "%.1f %sB" % (size / 1000**r, prefix[r])
