function that counts...
in [Python]
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From: Jerry Hill on 19 May 2010 16:46 On Wed, May 19, 2010 at 4:25 PM, superpollo <utente(a)esempio.net> wrote: > Jerry Hill ha scritto: >> Â Â Â Â sumofdigits = sum(int(char) for char in str(testval)) > > this line gives me this: > > TypeError: 'int' object is not callable > > is it some new feature in >2.5 ? No, sum() has been a builtin since Python 2.3. Based on your first post, you have probably shadowed the builtin "sum" function by assigning an integer to a variable named "sum". -- Jerry
From: Mark Dickinson on 19 May 2010 16:48 On May 19, 9:30 pm, superpollo <ute...(a)esempio.net> wrote: > René 'Necoro' Neumann ha scritto: > > An idea would be: > > >>>> def prttn(m, n): > > ... return sum(1 for x in range(n) if sum(map(int, str(x))) == m) > > TypeError: 'int' object is not callable > > on 2.5.4 The TypeError is almost certainly because you've created a integer 'sum' variable in your script/interpreter session, hiding the built-in sum function. -- Mark
From: superpollo on 19 May 2010 16:58 Jerry Hill ha scritto: > On Wed, May 19, 2010 at 4:25 PM, superpollo <utente(a)esempio.net> wrote: >> Jerry Hill ha scritto: >>> sumofdigits = sum(int(char) for char in str(testval)) >> this line gives me this: >> >> TypeError: 'int' object is not callable >> >> is it some new feature in >2.5 ? > > No, sum() has been a builtin since Python 2.3. Based on your first > post, you have probably shadowed the builtin "sum" function by > assigning an integer to a variable named "sum". o my... thanks! In [266]: del(sum) In [267]: def prttn2(m, n): """How many positive integers less than n have digits that sum up to m""" total = 0 for testval in range(n): sumofdigits = sum(int(char) for char in str(testval)) if sumofdigits == m: total += 1 return total .....: In [275]: def prttn3(m, n): return sum(1 for x in range(n) if sum(map(int, str(x))) == m) .....: In [277]: prttn(25, 10000) Out[277]: 348 In [278]: prttn2(25, 10000) Out[278]: 348 In [279]: prttn3(25, 10000) Out[279]: 348 ok, bye!
From: superpollo on 19 May 2010 16:58 Mark Dickinson ha scritto: > On May 19, 9:30 pm, superpollo <ute...(a)esempio.net> wrote: >> Ren� 'Necoro' Neumann ha scritto: >>> An idea would be: >>>>>> def prttn(m, n): >>> ... return sum(1 for x in range(n) if sum(map(int, str(x))) == m) >> TypeError: 'int' object is not callable >> >> on 2.5.4 > > The TypeError is almost certainly because you've created a integer > 'sum' variable in your script/interpreter session, hiding the built-in > sum function. thx
From: René 'Necoro' Neumann on 19 May 2010 17:31
Am 19.05.2010 22:58, schrieb superpollo: > > In [277]: prttn(25, 10000) > Out[277]: 348 > > In [278]: prttn2(25, 10000) > Out[278]: 348 > > In [279]: prttn3(25, 10000) > Out[279]: 348 > > ok, bye! Just because I was curios: necoro(a)Zakarumiy ~ % python -m timeit "import test; test.prttn(25,10000)" 10 loops, best of 3: 108 msec per loop necoro(a)Zakarumiy ~ % python -m timeit "import test; test.prttn2(25,10000)" 10 loops, best of 3: 157 msec per loop necoro(a)Zakarumiy ~ % python -m timeit "import test; test.prttn3(25,10000)" 10 loops, best of 3: 137 msec per loop Note: This is probably not representative ... just a quick check to get a raw feeling. - René |