Why does the int object is not callable error occur when using the sum function

Question

I m trying to figure out why I m getting an error when using the sum function on a range   Here is the code   data1   range 0  1000  3  data2   range 0  1000  5  data3   list set data1   data2     makes new list without duplicates total   sum data3    calculate sum of data3 list s elements print total   And here is the error   line 8  in  lt module gt  total2   sum data3  TypeError   int  object is not callable   I found this explanation for the error      In Python a  callable  is usually a function  The message means you are treating a number  an   int   as if it were a function  a  callable    so Python doesn t know what to do  so it  stops    I ve also read that sum   is capable of being used on lists  so I m wondering what is going wrong here   I just tried it in an IDLE module and it worked fine   However  it doesn t work in the python interpreter  Any ideas on how that can be

User · Answer

This means that somewhere else in your code  you have something like   sum   0   Which shadows the builtin sum  which is callable  with an int  which isn t

User · Answer

You probably redefined your  sum  function to be an integer data type   So it is rightly telling you that an integer is not something you can pass a range     To fix this  restart your interpreter   Python 2 7 3  default  Apr 20 2012  22 44 07    GCC 4 6 3  on linux2 Type  help    copyright    credits  or  license  for more information   gt  gt  gt  data1   range 0  1000  3   gt  gt  gt  data2   range 0  1000  5   gt  gt  gt  data3   list set data1   data2     makes new list without duplicates  gt  gt  gt  total   sum data3    calculate sum of data3 list s elements  gt  gt  gt  print total 233168   If you shadow the sum builtin  you can get the error you are seeing   gt  gt  gt  sum   0  gt  gt  gt  total   sum data3    calculate sum of data3 list s elements Traceback  most recent call last      File   lt stdin gt    line 1  in  lt module gt  TypeError   int  object is not callable   Also  note that sum will work fine on the set there is no need to convert it to a list

User · Answer

In the interpreter its easy to restart it and fix such problems  If you don t want to restart the interpreter  there is another way to fix it   Python 2 6 6  r266 84292  Dec 27 2010  00 02 40   GCC 4 4 5  on linux2 Type  help    copyright    credits  or  license  for more information   gt  gt  gt  l    1 2 3   gt  gt  gt  sum l  6  gt  gt  gt  sum   0   oops  shadowed a builtin   gt  gt  gt  sum l  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  TypeError   int  object is not callable  gt  gt  gt  import sys  gt  gt  gt  sum   sys modules    builtin     sum   -- fixing sum  gt  gt  gt  sum l  6   This also comes in handy if you happened to assign a value to any other builtin  like dict or list

[python] Why does the 'int' object is not callable error occur when using the sum() function?

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