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 07:54
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.
----------------------------------------------------------------------
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.
----------------------------------------------------------------------
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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