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class A:
   id = ""
   fld = []
   def __init__(self, id):
      self.id = id
                                                                                                                                                                               
                                                                                                                                                                               
def method(inp):
   a = A("a")
   b = A("b")
   c = A("c")
   a.fld.append("Histogram")
   a.fld.append("Dendogram")
   b.fld.append("Milligram")
   b.fld.append("Pictogram")
   c.fld.append("Pro--gram")
   c.fld.append("Dodge-ram")
   print a.fld
   print b.fld
   print c.fld
   inp.append(a)
   inp.append(c)
   inp.append(b)
                                                                                                                                                                               
#__main__                                                                                                                                                          
inp = []
method(inp)
                                                                                                                                                                               
for ins in inp:
    print "-----> " + ins.id
    for fl in ins.fld:
        print fl

Trying to understand why 18.print prints all the 12_17.appends
I am completely new and practising. Pls help!

['Histogram', 'Dendogram', 'Milligram', 'Pictogram', 'Pro--gram', 'Dodge-ram']
['Histogram', 'Dendogram', 'Milligram', 'Pictogram', 'Pro--gram', 'Dodge-ram']
['Histogram', 'Dendogram', 'Milligram', 'Pictogram', 'Pro--gram', 'Dodge-ram']
-----> a
Histogram
Dendogram
Milligram
Pictogram
Pro--gram
Dodge-ram
-----> c
Histogram
Dendogram
Milligram
Pictogram
Pro--gram
Dodge-ram
-----> b
Histogram
Dendogram
Milligram
Pictogram
Pro--gram
Dodge-ram
  • 2 Contributors
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  • 6 Hours Discussion Span
  • Latest Post Latest Post by vegaseat
Member Avatar for vegaseat

The way your class is written the list 'fld' is global to all instances of the class. You need to write your class this way ...

class A:
   id = ""
   #fld = []
   def __init__(self, id):
       self.fld = []
       self.id = id
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