Re: [Tutor] why different result from two similar ways
On 07/11/12 03:31, Prasad, Ramit wrote: Steven D'Aprano wrote: The isdigit method doesn't only work on a single character at a time, it works on an entire string: py> "12345".isdigit() True py> "12345a".isdigit() False I just want to point to the OP (Frank) that this only works for "digits" i.e. integers. It will fail for other types of numbers. That's why it's called "isdigit" not "isnumber" :) -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] why different result from two similar ways
Steven D'Aprano wrote:
> On 30/10/12 12:36, Frank Pontius wrote:
> > Hello,
> > I have code that works. Then tried to move some of it into function
> > IncrementAndRebuildInput, then result changes, I no longer have same result
> > as when code in function was inline - why?
>
> Have you tried running it in isolation to see what it does?
>
> When I try it, it works for me (apart from printing a lot of unnecessary
> intermediate results):
>
> py> result = IncrementAndRebuildInput("abc def 123 xyz 456")
> ['abc', 'def', '123', 'xyz', '456']
> 124
> ['abc', 'def', '124', 'xyz', '456']
> NOWHERE
> 457
> ['abc', 'def', '124', 'xyz', '457']
> NOWHERE
> ['abc', 'def', '124', 'xyz', '457']
> Point6
>
>
>
> Now check the returned result:
>
> py> result
> ['abc', 'def', '124', 'xyz', '457']
>
> So it certainly does increment the numbers in the string. The only
> bit it doesn't do is rebuild the string, but that takes just one
> minor change: instead of "return newstring" (by the way, that's false
> advertising -- newstring is not a string, it is a list), use:
>
> return ' '.join(newstring)
>
>
> You also use this function:
>
> > def IsNum(string):
> > #print "IsNum string", string
> > for char in string: #checks string groupings to be all nums
> > if not char.isdigit():
> > #print "false"
> > return False
> > #print "true"
> > return True
>
> You don't need it! The isdigit method doesn't only work on a single character
> at a time, it works on an entire string:
>
> py> "12345".isdigit()
> True
> py> "12345a".isdigit()
> False
I just want to point to the OP (Frank) that this only works for "digits" i.e.
integers. It will fail for other types of numbers.
>>> '12.3'.isdigit()
False
>>> '12.3'.isalnum()
False
~Ramit
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Re: [Tutor] why different result from two similar ways
On 30/10/12 12:36, Frank Pontius wrote:
Hello,
I have code that works. Then tried to move some of it into function
IncrementAndRebuildInput, then result changes, I no longer have same result
as when code in function was inline - why?
Have you tried running it in isolation to see what it does?
When I try it, it works for me (apart from printing a lot of unnecessary
intermediate results):
py> result = IncrementAndRebuildInput("abc def 123 xyz 456")
['abc', 'def', '123', 'xyz', '456']
124
['abc', 'def', '124', 'xyz', '456']
NOWHERE
457
['abc', 'def', '124', 'xyz', '457']
NOWHERE
['abc', 'def', '124', 'xyz', '457']
Point6
Now check the returned result:
py> result
['abc', 'def', '124', 'xyz', '457']
So it certainly does increment the numbers in the string. The only
bit it doesn't do is rebuild the string, but that takes just one
minor change: instead of "return newstring" (by the way, that's false
advertising -- newstring is not a string, it is a list), use:
return ' '.join(newstring)
You also use this function:
def IsNum(string):
#print "IsNum string", string
for char in string: #checks string groupings to be all nums
if not char.isdigit():
#print "false"
return False
#print "true"
return True
You don't need it! The isdigit method doesn't only work on a single character
at a time, it works on an entire string:
py> "12345".isdigit()
True
py> "12345a".isdigit()
False
--
Steven
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Re: [Tutor] why different result from two similar ways
On 30 October 2012 01:36, Frank Pontius wrote:
> Hello,
Hi,
It would be good if you could remove unnecessary debug code before
posting since it makes it harder for others to read your actual code.
Also why is there an empty line between each two lines of code? I
think this makes it much harder to read the code.
>
> I have code that works. Then tried to move some of it into function
> IncrementAndRebuildInput, then result changes, I no longer have same result
> as when code in function was inline – why?
Because you're not using the result returned by the function.
>
> Function version way below: (This version does not produce the
> same output (w/numbers incremented by 1)
>
> def IsNum(string):
>
> #print "IsNum string", string
>
> for char in string: #checks string groupings to be all nums
>
> if not char.isdigit():
>
> #print "false"
>
> return False
>
> #print "true"
>
> return True
You could always just return string.isdigit() instead of looping over
the characters in the string:
>>> s = '123'
>>> s.isdigit()
True
>>> s = '12r'
>>> s.isdigit()
False
>
>
>
> def IncrementAndRebuildInput(text):
>
> newtext = text.split()#makes a list from string input
>
> print newtext
>
> # print "Did I print LIST?"
>
> for index, element in enumerate(newtext):
>
> if IsNum(element): #looks@every list element,
> checks for #
>
> num = int(element) + 1 #if #, increments it
>
> print num
>
> # print "Bkpt8"
>
> newtext[index] = str(num)
>
> print newtext
>
> print "NOWHERE"
>
> else:
>
> pass
>
> #print "bkpt9"
>
> print newtext # contains new list w/#'s incremented by 1
>
> print "Point6"
>
> return newtext
Here the function returns the created list of strings.
>
>
> def main():
>
> text = raw_input("Type something: ")
>
> print
>
> if text:
>
> print text
>
> else:
>
> text = "I got 432 when I counted, but Jim got 433 which is a lot for
> only 6 cats, or were there 12 cats?"
>
> print text #string input
>
> IncrementAndRebuildInput(text)
The function returns a list of strings but you ignore its return
value. You need to do
text = IncrementAndRebuildInput(text)
to actually capture the output of the function in a variable called text.
>
> # print "bkpt10"
>
> print
>
> print text# ** Placing previous inline
> code into function changes result – what am I doing wrong?**
Oscar
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[Tutor] why different result from two similar ways
Hello,
I have code that works. Then tried to move some of it into function
IncrementAndRebuildInput, then result changes, I no longer have same result
as when code in function was inline - why?
(Function version way below)
Inline version: (this correctly adds 1 to all numbers in text string,
and prints it out with incremented #s):
def IsNum(string):
#print "IsNum string", string
for char in string: #checks string groupings to be all nums
if not char.isdigit():
#print "false"
return False
#print "true"
return True
def main():
text = raw_input("Type something: ")
print
if text:
print text
else:
text = "I got 432 when I counted, but Jim got 433 which is a lot for
only 6 cats, or were there 12 cats?"
print text #string input
SplitText = text.split()#makes a list from string input
# print SplitText
# print "Did I print LIST?"
for index, element in enumerate(SplitText):
if IsNum(element): #looks@every list element,
checks for #
num = int(element) + 1 #if #, increments it
# print num
# print "Bkpt8"
SplitText[index] = str(num)
else:
pass
#print "bkpt9"
# NewString = " ".join(SplitText)
print "bkpt10"
print
print SplitText
print
print " ".join(SplitText)
print
print "END"
main()
OUTPUT:::
>>>
>>>
Type something:
I got 432 when I counted, but Jim got 433 which is a lot for only 6 cats, or
were there 12 cats?
bkpt10
['I', 'got', '433', 'when', 'I', 'counted,', 'but', 'Jim', 'got', '434',
'which', 'is', 'a', 'lot', 'for', 'only', '7', 'cats,', 'or', 'were',
'there', '13', 'cats?']
I got 433 when I counted, but Jim got 434 which is a lot for only 7 cats, or
were there 13 cats?
END
>>>
Function version way below: (This version does not produce the
same output (w/numbers incremented by 1)
def IsNum(string):
#print "IsNum string", string
for char in string: #checks string groupings to be all nums
if not char.isdigit():
#print "false"
return False
#print "true"
return True
def IncrementAndRebuildInput(text):
newtext = text.split()#makes a list from string input
print newtext
# print "Did I print LIST?"
for index, element in enumerate(newtext):
if IsNum(element): #looks@every list element,
checks for #
num = int(element) + 1 #if #, increments it
print num
# print "Bkpt8"
newtext[index] = str(num)
print newtext
print "NOWHERE"
else:
pass
#print "bkpt9"
print newtext # contains new list w/#'s incremented by 1
print "Point6"
return newtext
def main():
text = raw_input("Type something: ")
print
if text:
print text
else:
text = "I got 432 when I counted, but Jim got 433 which is a lot for
only 6 cats, or were there 12 cats?"
print text #string input
IncrementAndRebuildInput(text)
# print "bkpt10"
print
print text# ** Placing previous inline
code into function changes result - what am I doing wrong?**
print "Point7"
print "".join(text)
print
print "END"
main()
OUTPUT:::
>>>
>>>
Type something:
I got 432 when I counted, but Jim got 433 which is a lot for only 6 cats, or
were there 12 cats?
['I', 'got', '432', 'when', 'I', 'counted,', 'but', 'Jim', 'got', '433',
'which', 'is', 'a', 'lot', 'for', 'only', '6', 'cats,', 'or', 'were',
'there', '12', 'cats?']
433
['I', 'got', '433', 'when', 'I', 'counted,', 'but', 'Jim', 'got', '433',
'which', 'is', 'a', 'lot', 'for', 'only', '6', 'cats,', 'or', 'were',
'there', '12', 'cats?']
NOWHERE
434
['I', 'got', '433', 'when', 'I', 'counted,', 'but', 'Jim', 'got', '434',
'which', 'is', 'a', 'lot', 'for', 'only', '6', 'cats,', 'or', 'were',
'there', '12', 'cats?']
NOWHERE
7
['I', 'got', '433', 'when', 'I', 'counted,', 'but', 'Jim', 'got', '434',
'which', 'is', 'a', 'lot', 'for', 'only', '7', 'cats,', 'or', 'were',
'there', '12', 'cats?']
NOWHERE
13
['I', 'got', '433', 'when', 'I', 'counted,', 'but', 'Jim', 'got', '434',
'which', 'is', 'a', 'lot', 'for', 'only', '7', 'cats,', 'or', 'were',
'there', '13', 'cats?']
NOWHERE
['I', 'got', '433', 'when', 'I', 'counted,', 'but', 'Jim', 'got', '434',
'which', 'is', 'a', 'lot', 'for', 'only', '7', 'cats,', 'or', 'were',
'there', '13', 'cats?']
Point6
I got 432 when I counted, but Jim got 433 which is a lot for only 6 cats, or
were there 12 cats?
Point7
I got 432 when I counted, but Jim got 433 which is a lot for only 6 cats, or
were there 12 cats?
END
>>>
>>>
Re: [Tutor] why different
You are right. When I switch to python23 folder, it works.On 5/5/06, Danny Yoo <[EMAIL PROTECTED] > wrote:On Fri, 5 May 2006, linda.s wrote:> I have two drives. The python24 is installed in c: and the code is in d: > drive (d:\data).> so what I did is:> d:\data> c:\python24\python test.pyHi Linda,Can you copy and paste the code to test.py? I suspect that the code doesnot contain a necessary import statement, but without seeing the code, we can't really say what's going on.Also, just off-hand: do you have several versions of Python on yoursystem? I see you have Python 2.4. Do you know if you have anotherversion of Python installed? The reason we ask is because of the following scenario: one possibility isthat the Numeric module is installed for another version of Python --- theone you're running with PythonWin --- and that would also explain the symptoms. But this is only a possibility; let's learn a little more aboutthe situation. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] why different
On Fri, 5 May 2006, linda.s wrote: > I have two drives. The python24 is installed in c: and the code is in d: > drive (d:\data). > so what I did is: > d:\data> c:\python24\python test.py Hi Linda, Can you copy and paste the code to test.py? I suspect that the code does not contain a necessary import statement, but without seeing the code, we can't really say what's going on. Also, just off-hand: do you have several versions of Python on your system? I see you have Python 2.4. Do you know if you have another version of Python installed? The reason we ask is because of the following scenario: one possibility is that the Numeric module is installed for another version of Python --- the one you're running with PythonWin --- and that would also explain the symptoms. But this is only a possibility; let's learn a little more about the situation. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] why different
I have two drives. The python24 is installed in c: and the code is in d: drive (d:\data). so what I did is: d:\data> c:\python24\python test.py On 5/5/06, Liam Clarke <[EMAIL PROTECTED]> wrote: Hi,Can you please copy and paste the code here? Also, can you pleaseclick on Start, select Run, and type cmd.exe, and in the new windowthat opens type the following command:C:\>echo %PATH%and then right click, select Mark, select the text that was outputtedand press enter to copu it and paste it here also? Lastly, what directory are you running your code from?Regards,Liam ClarkeOn 5/5/06, linda.s <[EMAIL PROTECTED]> wrote:> I run a code, which import Numeric module. When I run the code from > PythonWin, it is OK.> But when I run it from the command line, it reported "Importerror: No> Module named Numeric."> Why the systems perform differently?> Linda> >> ___> Tutor maillist - Tutor@python.org> http://mail.python.org/mailman/listinfo/tutor >>> ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] why different
Hi, Can you please copy and paste the code here? Also, can you please click on Start, select Run, and type cmd.exe, and in the new window that opens type the following command: C:\>echo %PATH% and then right click, select Mark, select the text that was outputted and press enter to copu it and paste it here also? Lastly, what directory are you running your code from? Regards, Liam Clarke On 5/5/06, linda.s <[EMAIL PROTECTED]> wrote: > I run a code, which import Numeric module. When I run the code from > PythonWin, it is OK. > But when I run it from the command line, it reported "Importerror: No > Module named Numeric." > Why the systems perform differently? > Linda > > > ___ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] why different
I run a code, which import Numeric module. When I run the code from PythonWin, it is OK. But when I run it from the command line, it reported "Importerror: No Module named Numeric." Why the systems perform differently? Linda ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
