Synnefo

# -*- coding: utf-8 -*-

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def strbigdec(bignum, nr_lsd=12):

    all_digits = str(bignum)

    ms_digits = all_digits[:-nr_lsd]

    if not ms_digits:

        return all_digits

    if len(ms_digits.rstrip('0')) == 1:

        approx = ''

    else:

        approx = '~'

    ls_digits = all_digits[-nr_lsd:]

    ls_num = int(ls_digits)

    ms_num = bignum - ls_num

    if ls_num:

        display = "[%s%1.0e]%+d" % (approx, ms_num, ls_num)

    else:

        display = "[%s%1.0e]" % (approx, ms_num)

    return display