[Python-bugs-list] [ python-Bugs-476435 ] inconsistant behavior with float and str (original) (raw)

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Tue, 30 Oct 2001 11:58:15 -0800

Bugs item #476435, was opened at 2001-10-30 10:52 You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=476435&group_id=5470

Category: Python Interpreter Core Group: Not a Bug Status: Closed Resolution: Invalid Priority: 5 Submitted By: Brian Hoenig (rambozo) Assigned to: Tim Peters (timone) Summary: inconsistant behavior with float and str

Initial Comment:

1.1 1.1000000000000001 str(1.1) '1.1' str(1.1000000000000001) '1.1'

This happens on 2.1.1 on Linux and win32. There seem to be several issues here.

Comment By: Tim Peters (tim_one) Date: 2001-10-30 11:58

Message: Logged In: YES user_id=31435

This is not a bug.

Binary floating point cannot represent decimal fractions exactly, so some rounding always occurs (even in Python 1.5.2).

What changed is that Python 2.0 shows more precision than before in certain circumstances (repr() and the interactive prompt).

You can use str() or print to get the old, rounded output:

print 0.1+0.1 0.2

Follow the link for more information:

http://python.sourceforge.net/devel-docs/tut/node14.html

You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=476435&group_id=5470