Someone tell me,
if not exist, how to write one with the same function?
I have made a try, but there is no character type in python,
so i failed, someone help me,
thanks very much 3 42371
"Robbie" <ro********@msn.com> wrote in message
news:bg***********@mail.cn99.com... Someone tell me, if not exist, how to write one with the same function? I have made a try, but there is no character type in python, so i failed, someone help me, thanks very much
int() should do the trick: s = "81" int(s)
81
Raymond Hettinger
On Sat, 2 Aug 2003 11:51:54 +0800, "Robbie" <ro********@msn.com>
wrote: Someone tell me, if not exist, how to write one with the same function? I have made a try, but there is no character type in python, so i failed, someone help me, thanks very much
General question: Have you read some of the tutorials?
Regarding your specific problem:
1. Think about it. A language without such a function would be utterly
useless.
2. There is a built-in function called int() -- look it up in the
manual.
3. Don't bother with the atoi() in the string module -- inspection of
...../Lib/string.py will tell you that it just calls int() anyway.
4. No character type? How would you like that, signed or unsigned or
implementation-defined? Python avoids that little chamber of horrors
and does rather well by using strings of length 1. Here's a rough
untested no-negative-allowed no-explicit-overflow-checking
base-10-only atoi() ...
def demo_atoi(astr):
num = 0
for c in astr:
if '0' <= c <= '9':
num = num * 10 + ord(c) - ord('0')
else:
raise ValueError('demo_atoi argument (%s) contains
non-digit(s)' % astr)
return num
On Fri, 01 Aug 2003 20:55:42 -0700, washu <wa***@127.0.0.1> wrote: On Sat, 02 Aug 2003 11:51:54 +0800, Robbie wrote:
Someone tell me, if not exist, how to write one with the same function? I have made a try, but there is no character type in python, so i failed, someone help me, thanks very much
I may be totally wrong but I believe there is a atoi in the strings modules.
Easy to check: import string help(string.atoi)
Help on function atoi in module string:
atoi(s, base=10)
atoi(s [,base]) -> int
Return the integer represented by the string s in the given
base, which defaults to 10. The string s must consist of one
or more digits, possibly preceded by a sign. If base is 0, it
is chosen from the leading characters of s, 0 for octal, 0x or
0X for hexadecimal. If base is 16, a preceding 0x or 0X is
accepted.
Regards,
Bengt Richter This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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