card 21 trick

[SummoningZ]

How do I fix this problem, please help I need it by next week I have been trying for at least 2 weeks.

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The error is "AttributeError: 'function' object has no attribute 'extend'"

Which is what I said :)

As for pasting code, stick it in [ python] tags, and either right click and "paste without formatting" or ctrl+shift+v to do the same.  The forum 100% allows indentation in code blocks:

def spam():
    return "eggs"

for _ in range(5):
    print(spam())

first = ("JS","4C","KC","3H","5H","AD","10H")
second = ("9H","7S","JD","6D","JC","2D","QC")
third = ("5C","JH","4S","QS","8D","9D","4H")

def packet(first,second,third):
  for i in range(0,21,3):
    first.insert(0, packet[i])
    second.insert(0, packet[i+1])
    third.insert(0, packet[i+2])

print("1: " + " ".join([str(card) for card in first]))
print("2: " + " ".join([str(card) for card in second]))
print("3: " + " ".join([str(card) for card in third]))

selection = int(input("> "))
if selection == 1:
  packet.extend(second)
  packet.extend(first)
  packet.extend(third)
elif selection == 2:
  packet.extend(first)
  packet.extend(second)
  packet.extend(third)
elif selection == 3:
  packet.extend(first)
  packet.extend(third)  
  packet.extend(second)

print("You're thinking of the %s" % packet[10])

Thats the code.