Why is 00100 = 64 in python?

Question

Why, like in the following python code, does 00100 equal 64?

>>> i = 00100
>>> i
64
>>> type(00100)
<type 'int'>
>>> str(00100)
'64'
>>> str("00100")
'00100'
>>> int(str("00100"))
100
>>>

I do not know Python but looks like `i = 00100` is interpreted as Octal. so, `1*8^2+0+0 = 64`. — Nishant, Mar 09 '11 at 09:53

score 9 · Accepted Answer · answered Mar 09 '11 at 09:52

9

its an octal value because of leading zeros

^calculator (hard to summarize)

answered Mar 09 '11 at 09:52

n00b

7

As an aside, note that in Python 3 this would be a syntax error, because the syntax for octal literals has changed. See http://stackoverflow.com/questions/1837874/invalid-token-when-using-octal-numbers – jchl Mar 09 '11 at 10:40

score 2 · Answer 2 · answered Mar 09 '11 at 09:54

2

In Python (and other languages too) when a number begin with 0 is interpreted as an octal number.

answered Mar 09 '11 at 09:54

Terseus

@n00b32 Hey, it happens. Sometimes it's because someone was typing the same time as you, or looking up a link, or sometimes they think they can answer the question more clearly or with extra information. You often get more upvotes if you win the race, but that's not everything. – Rup Mar 09 '11 at 10:08
i know, i dont downvote if some one answers within 5 minutes... i just remind ;) – n00b Mar 09 '11 at 13:28

score 1 · Answer 3 · answered Mar 09 '11 at 09:55

1

1 is 01, 2 is 02, ..., 7 is 07, 8 is 10 (yes!), 9 is 011, etc.

answered Mar 09 '11 at 09:55

genobis

3 Answers3