Re: Writing a string.ishex function
In article mailman.924.1263494171.28905.python-l...@python.org,
MRAB pyt...@mrabarnett.plus.com wrote:
D'Arcy J.M. Cain wrote:
On Thu, 14 Jan 2010 07:52:58 -0800 (PST)
chandra chyav...@gmail.com wrote:
Folks,
I am new to Python and could not find a function along the lines of
Welcome.
string.ishex in Python. There is however, a string.hexdigits constant
in the string module. I thought I would enhance the existing modlue
but am unsure how I should go about it. Specifically, I have attempted
this much:
You should always test code before posting and post the exact code that
you tested.
---cut---
#! /usr/bin/python
# -*- coding: utf-8 -*-
import string
def ishex(string):
Bad idea to name your variable after a module. This function fails
because of that.
ishex = False
for i in strdef ishex(sing:
if i in string.hexdigits:
ishex = True
else:
ishex = False
break
return ishex
After renaming the variable this works but you can simplify it.
---cut---
Just return False once you find a non-hex digit.
def ishex(s):
for c in s:
if not c in string.hexdigits: return False
return True
And here are your unit tests. Every line should print True.
print ishex('123') is True
print ishex('abc') is True
print ishex('xyz') is False
print ishex('0123456789abcdefABCDEF') is True
print ishex('0123456789abcdefABCDEFG') is False
Don't use 'is', use '=='.
BTW, ishex('') should return False.
You are very wrong. Not with the above statement, but
the very act of issuing a statement like that is wrong.
The OP didn't specify ishex().
In absence of a specification, border cases are not defined.
If the specification was:
any character of string s must be a hex character
then ishex('') should return True.
If the specification was:
the string must represent a hex number
then ishex('') should probably return False.
I can imagine a specification where it is appropriate to
throw an exception for an empty string.
This is also the safest thing to do, if there is the slightest
hesitation.
So the correct behaviour is:
Please mister customer, what exactly did you have in mind?
Groetjes Albert
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Re: Writing a string.ishex function
MRAB pyt...@mrabarnett.plus.com wrote:
Duncan Booth wrote:
MRAB pyt...@mrabarnett.plus.com wrote:
I raise you one character:
ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine
I could actually go three better:
ishex3=lambda s:not set(s)-set(string.hexdigits)
But none of those pass your own ishex('') should return False test.
Neither do the others!
That's true, but since you were the one that pointed out they were all
broken I would have thought your solution should actually work.
I'm sure you'll agree that a longer solution that works trumps any short
but broken solution.
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Re: Writing a string.ishex function
2010/1/15 Duncan Booth duncan.bo...@invalid.invalid:
MRAB pyt...@mrabarnett.plus.com wrote:
Duncan Booth wrote:
MRAB pyt...@mrabarnett.plus.com wrote:
I raise you one character:
ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine
I could actually go three better:
ishex3=lambda s:not set(s)-set(string.hexdigits)
But none of those pass your own ishex('') should return False test.
Neither do the others!
That's true, but since you were the one that pointed out they were all
broken I would have thought your solution should actually work.
I'm sure you'll agree that a longer solution that works trumps any short
but broken solution.
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ishex=lambda s:bool(re.match([a-fA-F0-9]+$,s))
?
vbr
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Re: Writing a string.ishex function
Duncan Booth wrote:
MRAB pyt...@mrabarnett.plus.com wrote:
Duncan Booth wrote:
MRAB pyt...@mrabarnett.plus.com wrote:
I raise you one character:
ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine
I could actually go three better:
ishex3=lambda s:not set(s)-set(string.hexdigits)
But none of those pass your own ishex('') should return False test.
Neither do the others!
That's true, but since you were the one that pointed out they were all
broken I would have thought your solution should actually work.
I'm sure you'll agree that a longer solution that works trumps any short
but broken solution.
I believe that the rules of the character-counting game don't require
correctness, only that it's no worse.
A real solution would use 'def', have a docstring, etc, of course.
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Re: Writing a string.ishex function
On Fri, 15 Jan 2010 00:53:51 +, Steven D'Aprano wrote:
On Thu, 14 Jan 2010 18:36:12 +, MRAB wrote:
BTW, ishex('') should return False.
Only if you want to be inconsistent with other isFoo string functions:
''.isalpha()
False
I said what???
Sorry MRAB, what I wrote there was obvious nonsense. I should be agreeing
with you, not disagreeing!
--
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Re: Writing a string.ishex function
On Jan 14, 3:52 pm, chandra chyav...@gmail.com wrote: Folks, I am new to Python and could not find a function along the lines of string.ishex in Python. There is however, a string.hexdigits constant in the string module. I thought I would enhance the existing modlue but am unsure how I should go about it. Specifically, I have attempted this much: ---cut--- #! /usr/bin/python # -*- coding: utf-8 -*- import string def ishex(string): ishex = False for i in string: if i in string.hexdigits: ishex = True else: ishex = False break return ishex ---cut--- Can someone help me get further along please? Thanks. better would be: def ishex(s): for c in s: if c not in string.hexdigits: return False return True Iain -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
On Thu, 14 Jan 2010 07:52:58 -0800 (PST)
chandra chyav...@gmail.com wrote:
Folks,
I am new to Python and could not find a function along the lines of
Welcome.
string.ishex in Python. There is however, a string.hexdigits constant
in the string module. I thought I would enhance the existing modlue
but am unsure how I should go about it. Specifically, I have attempted
this much:
You should always test code before posting and post the exact code that
you tested.
---cut---
#! /usr/bin/python
# -*- coding: utf-8 -*-
import string
def ishex(string):
Bad idea to name your variable after a module. This function fails
because of that.
ishex = False
for i in strdef ishex(sing:
if i in string.hexdigits:
ishex = True
else:
ishex = False
break
return ishex
After renaming the variable this works but you can simplify it.
---cut---
Just return False once you find a non-hex digit.
def ishex(s):
for c in s:
if not c in string.hexdigits: return False
return True
And here are your unit tests. Every line should print True.
print ishex('123') is True
print ishex('abc') is True
print ishex('xyz') is False
print ishex('0123456789abcdefABCDEF') is True
print ishex('0123456789abcdefABCDEFG') is False
--
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http://www.druid.net/darcy/| and a sheep voting on
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Re: Writing a string.ishex function
On Jan 15, 12:22 am, D'Arcy J.M. Cain da...@druid.net wrote:
Just return False once you find a non-hex digit.
def ishex(s):
for c in s:
if not c in string.hexdigits: return False
return True
And here are your unit tests. Every line should print True.
print ishex('123') is True
print ishex('abc') is True
print ishex('xyz') is False
print ishex('0123456789abcdefABCDEF') is True
print ishex('0123456789abcdefABCDEFG') is False
Thanks to Iain and to you.
One further question: even though it is a single function, is there
any way to convert it into a module? Can existing modules be enhanced
with functions such as these? If not, how may I make my own module,
called, say mystring? At present, I am saving the file as ishex.py and
calling it after declaring
from ishex import ishex
Is there a more elegant way to integrate this function and make it
available to other python scripts using the import mechanism?
Thanks.
Chandra
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Re: Writing a string.ishex function
On Thu, Jan 14, 2010 at 8:14 AM, Iain King iaink...@gmail.com wrote: On Jan 14, 3:52 pm, chandra chyav...@gmail.com wrote: Folks, I am new to Python and could not find a function along the lines of string.ishex in Python. There is however, a string.hexdigits constant in the string module. I thought I would enhance the existing modlue but am unsure how I should go about it. Specifically, I have attempted this much: ---cut--- #! /usr/bin/python # -*- coding: utf-8 -*- import string def ishex(string): ishex = False for i in string: if i in string.hexdigits: ishex = True else: ishex = False break return ishex ---cut--- Can someone help me get further along please? Thanks. better would be: def ishex(s): for c in s: if c not in string.hexdigits: return False return True Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
chandra wrote:
On Jan 15, 12:22 am, D'Arcy J.M. Cain da...@druid.net wrote:
Just return False once you find a non-hex digit.
def ishex(s):
for c in s:
if not c in string.hexdigits: return False
return True
And here are your unit tests. Every line should print True.
print ishex('123') is True
print ishex('abc') is True
print ishex('xyz') is False
print ishex('0123456789abcdefABCDEF') is True
print ishex('0123456789abcdefABCDEFG') is False
Thanks to Iain and to you.
One further question: even though it is a single function, is there
any way to convert it into a module? Can existing modules be enhanced
with functions such as these? If not, how may I make my own module,
called, say mystring? At present, I am saving the file as ishex.py and
calling it after declaring
from ishex import ishex
Is there a more elegant way to integrate this function and make it
available to other python scripts using the import mechanism?
Nope, that's about as elegant as it gets.
You can, of course, include it in a generic utility module and import
several things from that module - you aren't limited to defining a
single object in a module.
regards
Steve
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Re: Writing a string.ishex function
On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebert c...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) -- D'Arcy J.M. Cain da...@druid.net | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
Iain King wrote: better would be: def ishex(s): for c in s: if c not in string.hexdigits: return False return True Even more elegant and probably a faster solutions: --- from string import hexdigits hexdigits = frozenset(hexdigits) def ishex(s): return set(s).issubset(hexdigits) --- If you are also interested in the integer value of a hex string: --- def gethex(s): try: return int(s, 16) except ValueError: return None --- Check for gethex(s) is not None to see if s is a hex string. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
D'Arcy J.M. Cain da...@druid.net writes: On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebert c...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) I'see your one-liner and raise you by four characters :o) ishex1 = lambda s: all(c in string.hexdigits for c in s) # Yours ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Mine Notice that ishex2 is more accurate than ishex1. E.g. ishex1(['abc', '123']) True ishex2(['abc', '123']) False -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
D'Arcy J.M. Cain wrote:
On Thu, 14 Jan 2010 07:52:58 -0800 (PST)
chandra chyav...@gmail.com wrote:
Folks,
I am new to Python and could not find a function along the lines of
Welcome.
string.ishex in Python. There is however, a string.hexdigits constant
in the string module. I thought I would enhance the existing modlue
but am unsure how I should go about it. Specifically, I have attempted
this much:
You should always test code before posting and post the exact code that
you tested.
---cut---
#! /usr/bin/python
# -*- coding: utf-8 -*-
import string
def ishex(string):
Bad idea to name your variable after a module. This function fails
because of that.
ishex = False
for i in strdef ishex(sing:
if i in string.hexdigits:
ishex = True
else:
ishex = False
break
return ishex
After renaming the variable this works but you can simplify it.
---cut---
Just return False once you find a non-hex digit.
def ishex(s):
for c in s:
if not c in string.hexdigits: return False
return True
And here are your unit tests. Every line should print True.
print ishex('123') is True
print ishex('abc') is True
print ishex('xyz') is False
print ishex('0123456789abcdefABCDEF') is True
print ishex('0123456789abcdefABCDEFG') is False
Don't use 'is', use '=='.
BTW, ishex('') should return False.
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Re: Writing a string.ishex function
MRAB wrote:
BTW, ishex('') should return False.
So should int('')!
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Re: Writing a string.ishex function
Arnaud Delobelle wrote: D'Arcy J.M. Cain da...@druid.net writes: On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebert c...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) I'see your one-liner and raise you by four characters :o) ishex1 = lambda s: all(c in string.hexdigits for c in s) # Yours ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Mine I raise you one character: ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine I could actually go three better: ishex3=lambda s:not set(s)-set(string.hexdigits) :-) Notice that ishex2 is more accurate than ishex1. E.g. ishex1(['abc', '123']) True ishex2(['abc', '123']) False -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
Phlip wrote:
MRAB wrote:
BTW, ishex('') should return False.
So should int('')!
Why?
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Re: Writing a string.ishex function
MRAB pyt...@mrabarnett.plus.com wrote:
I raise you one character:
ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine
I could actually go three better:
ishex3=lambda s:not set(s)-set(string.hexdigits)
But none of those pass your own ishex('') should return False test.
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Re: Writing a string.ishex function
Phlip wrote:
MRAB wrote:
BTW, ishex('') should return False.
So should int('')!
Did you mean isint('') ?
JM
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Re: Writing a string.ishex function
Duncan Booth wrote:
MRAB pyt...@mrabarnett.plus.com wrote:
I raise you one character:
ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine
I could actually go three better:
ishex3=lambda s:not set(s)-set(string.hexdigits)
But none of those pass your own ishex('') should return False test.
Neither do the others!
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Re: Writing a string.ishex function
On 14 Jan 2010 19:19:53 GMT
Duncan Booth duncan.bo...@invalid.invalid wrote:
ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine
I could actually go three better:
ishex3=lambda s:not set(s)-set(string.hexdigits)
But none of those pass your own ishex('') should return False test.
Good point. Obviously a unit test was missing.
Of course, all this is good clean fun but I wonder how useful an ishex
method really is. Personally I would tend to do this instead.
try: x = isinstance(s, int) and s or int(s, 0)
except ValueError: [handle invalid input]
IOW return the value whether it is a decimal string (e.g. 12), a hex
string (e.g. 0xaf) or even if it is already an integer. Of course,
you still have to test for '' and None.
Naturally this all depends heavily on the actual requirements. Perhaps
that's why there is no ishex method in the first place. Such a method
could wind up with more options than ls(1)
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Re: Writing a string.ishex function
On Thu, 14 Jan 2010 18:36:12 +
MRAB pyt...@mrabarnett.plus.com wrote:
print ishex('123') is True
print ishex('abc') is True
print ishex('xyz') is False
print ishex('0123456789abcdefABCDEF') is True
print ishex('0123456789abcdefABCDEFG') is False
Don't use 'is', use '=='.
Why? There is only one True and one False in Python. Is it a style
issue for you? If so then say shouldn't not don't.
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Re: Writing a string.ishex function
On 08:15 pm, da...@druid.net wrote:
On 14 Jan 2010 19:19:53 GMT
Duncan Booth duncan.bo...@invalid.invalid wrote:
ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine
I could actually go three better:
ishex3=lambda s:not set(s)-set(string.hexdigits)
But none of those pass your own ishex('') should return False test.
Good point. Obviously a unit test was missing.
Of course, all this is good clean fun but I wonder how useful an ishex
method really is. Personally I would tend to do this instead.
try: x = isinstance(s, int) and s or int(s, 0)
except ValueError: [handle invalid input]
IOW return the value whether it is a decimal string (e.g. 12), a hex
string (e.g. 0xaf) or even if it is already an integer. Of course,
you still have to test for '' and None.
Still missing some unit tests. This one fails for 0. Spend a few more
lines and save yourself some bugs. :)
Jean-Paul
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Re: Writing a string.ishex function
MRAB pyt...@mrabarnett.plus.com writes: Arnaud Delobelle wrote: D'Arcy J.M. Cain da...@druid.net writes: On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebert c...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) I'see your one-liner and raise you by four characters :o) ishex1 = lambda s: all(c in string.hexdigits for c in s) # Yours ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Mine I raise you one character: ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine Aha! The Operator Precedence trick! I fold. I could actually go three better: ishex3=lambda s:not set(s)-set(string.hexdigits) In this case, I'll go five better: h=lambda s:not set(s)-set(string.hexdigits) ;-) -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
On 1/14/2010 12:44 PM, D'Arcy J.M. Cain wrote: On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebertc...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) This is inferior because the resulting function object has generic name attribute 'lambda' instead of the specific name 'ishax'. Please do not push such inferior code on new programmers. Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
Arnaud Delobelle wrote: MRAB pyt...@mrabarnett.plus.com writes: Arnaud Delobelle wrote: D'Arcy J.M. Cain da...@druid.net writes: On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebert c...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) I'see your one-liner and raise you by four characters :o) ishex1 = lambda s: all(c in string.hexdigits for c in s) # Yours ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Mine I raise you one character: ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine Aha! The Operator Precedence trick! I fold. I could actually go three better: ishex3=lambda s:not set(s)-set(string.hexdigits) In this case, I'll go five better: h=lambda s:not set(s)-set(string.hexdigits) ;-) Touché! -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
In article mailman.935.1263499719.28905.python-l...@python.org, D'Arcy J.M. Cain da...@druid.net wrote: try: x = isinstance(s, int) and s or int(s, 0) except ValueError: [handle invalid input] Why aren't you using the ternary? -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ If you think it's expensive to hire a professional to do the job, wait until you hire an amateur. --Red Adair -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
On Thu, 14 Jan 2010 18:36:12 +, MRAB wrote:
And here are your unit tests. Every line should print True.
print ishex('123') is True
print ishex('abc') is True
print ishex('xyz') is False
print ishex('0123456789abcdefABCDEF') is True
print ishex('0123456789abcdefABCDEFG') is False
Don't use 'is', use '=='.
I beg to differ. In this case, since ishex is intended to return True or
False and not 1.0 or Decimal(0), the correct test for the purposes of
unit-testing is the identity test, not equality.
However, for the purposes of *displaying* the result, rather than saying:
print ishex('123') is True
one should obviously say:
print ishex('123') is True is True
No, wait, that should be:
print ishex('123') is True is True is True
No wait, this is better:
print ishex('123') is True is True is True is True
*wink*
Seriously, just say print ishex('123'). It already returns True or False,
you don't need to compare it to True or False to get a True or False
answer.
BTW, ishex('') should return False.
Only if you want to be inconsistent with other isFoo string functions:
''.isalpha()
False
''.isupper()
False
''.islower()
False
''.isspace()
False
Also, if ishex(s) returns True, then a reasonable person will expect that
calling int(s, 16) should succeed. But if s is the empty string, it will
fail.
--
Steven
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Re: Writing a string.ishex function
On 14 Jan., 19:48, MRAB pyt...@mrabarnett.plus.com wrote: Arnaud Delobelle wrote: D'Arcy J.M. Cain da...@druid.net writes: On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebert c...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) I'see your one-liner and raise you by four characters :o) ishex1 = lambda s: all(c in string.hexdigits for c in s) # Yours ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Mine I raise you one character: ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine I could actually go three better: ishex3=lambda s:not set(s)-set(string.hexdigits) :-) ishex4=lambda s:not s.strip(string.hexdigits) -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing a string.ishex function
Wolfram Hinderer wrote: On 14 Jan., 19:48, MRAB pyt...@mrabarnett.plus.com wrote: Arnaud Delobelle wrote: D'Arcy J.M. Cain da...@druid.net writes: On Thu, 14 Jan 2010 09:07:47 -0800 Chris Rebert c...@rebertia.com wrote: Even more succinctly: def ishex(s): return all(c in string.hexdigits for c in s) I'll see your two-liner and raise you. :-) ishex = lambda s: all(c in string.hexdigits for c in s) I'see your one-liner and raise you by four characters :o) ishex1 = lambda s: all(c in string.hexdigits for c in s) # Yours ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Mine I raise you one character: ishex2 = lambda s: not(set(s)-set(string.hexdigits)) # Yours ishex3 = lambda s: not set(s)-set(string.hexdigits) # Mine I could actually go three better: ishex3=lambda s:not set(s)-set(string.hexdigits) :-) ishex4=lambda s:not s.strip(string.hexdigits) Doh! -- http://mail.python.org/mailman/listinfo/python-list
