TypeError: 'list' object is not callable, error calling extend from inherited list class

Question

I wrote the following code,

    #sanitize fuction
def sanitize(time_string):
   if '-' in time_string:
      splitter = '-'
   elif ':' in time_string:
      splitter = ':'
   else:
      return(time_string)
   (mins, secs) = time_string.split(splitter)
   return(mins + '.' + secs)

class AthleteList(list):
   def __init__(self, a_name, a_dob=None, a_times=[]):
      list.__init__([])
      self.name = a_name
      self.dob = a_dob
      self.extend = a_times
   def top3(self):
      return(sorted(set([sanitize(t) for t in self]))[0:3])

#get coach data fuction
def get_coach_data(filename):
   try:
      with open(filename) as f:
         data = f.readline()
         templ = data.strip().split(',')
         return(AthleteList(templ.pop(0), templ.pop(0), templ))
   except IOError as ioerr:
      print('File error: ' + str(ioerr))
      return(None)

sarah = get_coach_data("sarah2.txt")
julie = get_coach_data("julie2.txt")
james = get_coach_data("james2.txt")
mikey= get_coach_data("mikey2.txt")

vera = AthleteList('vera')
vera.append('1.33')
vera.extend(['1.74','1.46','1.42','1.40'])
print(vera.top3())

When I run this code, it shows the following error.
But it only shows error when I use extend method.
I can use append method with no probs.

vera.extend([‘1.74′,’1.46′,’1.42′,’1.40’])

TypeError: ‘list’ object is not callable

Asked By: Akhil Ravindran

||

Source

Answer 1

To Access list you need to use the square brackets ([]) and not the parenthesis (()).

instead of

vera.extend(['1.74','1.46','1.42','1.40'])

use

  aList = ['1.74','1.46','1.42','1.40']
   vera.extend(aList)

Answered By: Manoj Kengudelu

Answer 2

Follow the execution path from AthleteList('vera'), noting how self.extend gets initialized to a list, which shadows the function you expect.

what’s happening is essentially this:

>>> extend = []
>>> extend(['foo'])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'list' object is not callable

Answered By: Dave W. Smith

Answer 3

You’re basically trying to call a list (self.extend = a_times and a_times = []), which is impossible.

What you’d need to do, is use:

vera.extend.extend(['1.74','1.46','1.42','1.40'])

Or either this (as mentioned before):

vera.extend = ['1.74','1.46','1.42','1.40']

But actually this is not exactly correct either (given we need vera list and not vera.extend one [missed this when first posted, sorry!]), as shown here:

>>> vera = AthleteList("vera")
>>> vera.extend = ['1.74','1.46','1.42','1.40']
>>> print(vera.top3())
[]
>>> vera.extend.extend(['1.74','1.46','1.42','1.40'])
>>> print(vera.top3())
[]

The correct answer would be remove self.extend from AthleteList class so it works the way you want it (vera.extend(['1.74','1.46','1.42','1.40'])).

>>> vera = AthleteList("vera")
>>> vera.extend(['1.74','1.46','1.42','1.40'])
>>> print(vera.top3())
['1.40', '1.42', '1.46']

So, class should be like this:

class AthleteList(list):
   def __init__(self, a_name, a_dob=None, a_times=[]):
      list.__init__([])
      self.name = a_name
      self.dob = a_dob
   def top3(self):
      return(sorted(set([sanitize(t) for t in self]))[0:3])

Hope it helps!

Answered By: JeDaYoshi

Answer 4

According to your code, you have initialized a class variable extend to an empt list.

self.extend = a_times

where a_times = []

It is a variable, not a function according to your code. That is why it is throwing an error of ‘not callable‘

Change the following line of code:

vera.extend(['1.74','1.46','1.42','1.40']) to vera.extend = ['1.74','1.46','1.42','1.40'].

Hope it helps!

Answered By: abhinav

Answer 5

I think the problem is in the definition of class AtheleteList

self.extend = a_times should change to self.extend(a_times)

Answered By: wei zhu

TypeError: 'list' object is not callable, error calling extend from inherited list class

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