Python initializes objects with wrong default values

Question

I tried to solve the following problem the last few hours but it didn't work out.

I have two python files, one for creating classes and the second one for actually working with those classes.

I create the class hh (=households) as follows but we can focus only on the fltCash attribute because that's where the issue occurs; I used setters/getters only for this attribute at the bottom of the code as I was hoping that it could fix this issue.

# agent: households
class hh(agent):
  def __init__(self, intId = 0,
             # Income
             fltCash = [100],
             fltWage = [25],
             fltInterest = [25],
             fltDividend = [25],
             fltTransfer = [25],

             # Employment
             intEmployerId = [-1],

             # MinWage Preferences
             fltIncomeweight = 1,
             fltLoyalty2Employer = [-1], 

             # Utility Function
             fltPref_a = 0.5,
             fltPref_b = 1,

             # Variables
             intMinWage = -1
             ):

    # def in superclass agent
    agent.__init__(self, intId)

    # def in childclass hh
    self.fltCash = fltCash
    self.fltWage = fltWage
    self.fltInterest = fltInterest
    self.fltDividend = fltDividend
    self.fltTransfer = fltTransfer
    self.intEmployerId = intEmployerId
    self.fltIncomeweight = fltIncomeweight
    self.fltLoyalty2Employer = fltLoyalty2Employer
    self.fltPref_a = fltPref_a
    self.fltPref_b = fltPref_b
    self.intMinWage = intMinWage

    ## Setter / Getter Section
    @property
    def fltCash(self):
        return self.__fltCash

    @fltCash.setter
    def fltCash(self, value):
        if value.isdigit():
            self.__fltCash = value
        else:
            print("Ungueltiger Wert fuer fltCash: {}".format(value))

In another file I define my main class where I create an object from this class. However, right after initializing the fltCash attribute of this object contains not a list with only the default value but a list which various integers which seem to be random to me.

Has anyone a clue what's the reason for this behaviour and/or how to avoid it?

Any help would be highly appreciated.

Best Lukas

EDIT: Here is a simplified version of my code, I figure it's very stupid bug in my code but I can't find it:

import random as rd

class agent:
  def __init__(self, intId = 0):
    self.intId = intId

class hh(agent):
  def __init__(self, intId = 0, fltCash = [100]):

    # def in superclass agent
    agent.__init__(self, intId)

    # def in childclass hh
    self.fltCash = fltCash


class firm(agent):
   def __init__(self, intId = 0, fltCurrentAssets = [50]):

    # def in superclass agent
    agent.__init__(self, intId)

    # def in childclass hh
    self.fltCurrentAssets = fltCurrentAssets

def main(): 
  ### create agents
  luke = hh(intId=3)
  univie = firm(intId=2)

  ## HERE I'D EXPECT [100] AND [100]
  print(luke.fltCash)
  print(univie.fltCurrentAssets)

  ### action
  i = 0
  while True:
      fltTransfer = rd.randrange(0,51)

      if luke.fltCash[i] > univie.fltCurrentAssets[i]:
          luke.fltCash.append(luke.fltCash[i] - fltTransfer)
          univie.fltCurrentAssets.append(fltTransfer + univie.fltCurrentAssets[i])
      else:
          luke.fltCash.append(fltTransfer + luke.fltCash[i])
          univie.fltCurrentAssets.append(univie.fltCurrentAssets[i] - fltTransfer)
      i += 1

      if luke.fltCash[i] < 0 or univie.fltCurrentAssets[i] < 0:
          print("Game over! Luke: {}, \n Univie: {}".format(luke.fltCash,\
              univie.fltCurrentAssets))
          del luke
          del univie
          break
      if i > 10: 
          del luke
          del univie
          break