[ python-Bugs-1215146 ] int('x',radix) puzzle

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Bugs item #1215146, was opened at 2005-06-05 06:11
Message generated for change (Comment added) made by azgordo
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Category: Python Library
Group: Python 2.4
Status: Closed
Resolution: Invalid
Priority: 5
Submitted By: elgordo (azgordo)
Assigned to: Nobody/Anonymous (nobody)
Summary: int('x',radix) puzzle

Initial Comment:
I don’t understand the built-in function int(x, radix). Or 
its documentation in the Library Reference section 2.1 – 
Built-In Functions. I’m using Python 2.4.1 on Windows 
XP Pro w/SP2, And I get the following on IDLE:

>>> int(9)
9
>>> int('9')
9
>>> int('9',2)

Traceback (most recent call last):
  File "<pyshell#31>", line 1, in -toplevel-
    int('9',2)
ValueError: invalid literal for int(): 9
>>> int('9',8)

Traceback (most recent call last):
  File "<pyshell#32>", line 1, in -toplevel-
    int('9',8)
ValueError: invalid literal for int(): 9
>>> int('9',10)
9
>>> int('9',16)
9
>>> int('19',16)
25
>>>


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>Comment By: elgordo (azgordo)
Date: 2005-06-05 07:52

Message:
Logged In: YES 
user_id=1291540

OK --- I was confused by the documentation. I'd like to 
propose the following replacement for the documentation:

int([x[, b]])
Converts base b numbers specified by the inputs to their 
decimal integer equivalents. When the base b is absent x 
may be either (i) the string representation of a possibly 
signed decimal integer (possibly embedded in whitespace), 
or (ii) a possibly signed decimal integer or floating point 
number (floating point numbers are truncated towards zero). If 
the base b is present and non-zero, it must be an integer in 
the range [2, 36] and x must be the possibly signed string 
representation of an integer in base b notation. When x is a 
string and the base b is zero, the base actually used is 
guessed by interpreting the string x in the same way as for 
integer literals.  When b is present then (i) if  x is not a string 
a TypeError is raised, and (ii) if the string x does not 
represent an integer then a ValueError is raised. Returns 0 if 
no arguments are given.


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Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-06-05 07:08

Message:
Logged In: YES 
user_id=1188172

The function is behaving as expected. The radix argument
specifies which base the number system in the string has.
Radix 2 means binary, for example, and radix 16 hexadecimal.
>From that, it is clear that '9' is an invalid binary or
octal number.

In the future, please direct such questions to the Newsgroup
comp.lang.python.

Closing as Invalid.

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