On Fri, 22 Jan 2016 12:59 pm, Grobu wrote: > On 21/01/16 09:39, Shiyao Ma wrote: >> Hi, >> >> I wanna simulate C style integer division in Python3. >> >> So far what I've got is: >> # a, b = 3, 4 >> >> import math >> result = float(a) / b >> if result > 0: >> result = math.floor(result) >> else: >> result = math.ceil(result) >> >> >> I found it's too laborious. Any quick way? >> > > math.trunc( float(a) / b )
That fails for sufficiently big numbers: py> a = 3**1000 * 2 py> b = 3**1000 py> float(a)/b # Exact answer should be 2 Traceback (most recent call last): File "<stdin>", line 1, in <module> OverflowError: long int too large to convert to float Note that Python gets the integer division correct: py> a//b 2L And even gets true division correct: py> from __future__ import division py> a/b 2.0 so it's just the intermediate conversion to float that fails. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
