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])

(Aug-16-2017, 05:50 PM)SummoningZ Wrote: but am stuck on why it is not running

(Aug-16-2017, 05:50 PM)SummoningZ Wrote:  

(Aug-16-2017, 08:48 PM)SummoningZ Wrote: The error is "AttributeError: 'function' object has no attribute 'extend'"

def spam():
    return "eggs"

for _ in range(5):
    print(spam())

(Aug-16-2017, 09:08 PM)nilamo Wrote:

(Aug-16-2017, 08:48 PM)SummoningZ Wrote: 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])

(Aug-17-2017, 12:38 AM)sparkz_alot Wrote: As @nilamo pointed out, you've defined "packet" as a function and as such has no attribute ".extend", lists, however do. Have no idea what you are trying to do with "packet" within your for loop. Your function has no "return", that may turn out to be helpful.

def mult(x, y):
    result = x * y
    return result

no_1 = 2
no_2 = 4
product = mult(no_1, no_2)
print(product)

(Aug-17-2017, 12:52 PM)sparkz_alot Wrote: You use the ".extend" by using lists. So for example, if "first", "second" and "third" were lists rather than tuples, you could use ".extend" with them, ie "first.extend(iterable)". The "return" is placed at the end of the function and in general returns the results of what happens within the function.

def mult(x, y):
    result = x * y
    return result

no_1 = 2
no_2 = 4
product = mult(no_1, no_2)
print(product)

In your situation, it's not just that you know how the trick is played, but also the math on which the trick is based. Here is a pretty good explanation of that math: Math behind 21 Card Trick.

If it were me, I would start with a main list of all 21 cards, and first, second, third start as empty lists which could be filled at a later time (within a function), you need to deal the cards, display the cards, ask for user choice, collect the cards (each step 3 times), finally reveal the eleventh card.

To be honest, I can't help but feel that either your answer or perhaps some snippets from the assignment are based on the program by dylanfw on GH.

(Aug-17-2017, 12:52 PM)sparkz_alot Wrote: You use the ".extend" by using lists. So for example, if "first", "second" and "third" were lists rather than tuples, you could use ".extend" with them, ie "first.extend(iterable)". The "return" is placed at the end of the function and in general returns the results of what happens within the function.

def mult(x, y):
    result = x * y
    return result

no_1 = 2
no_2 = 4
product = mult(no_1, no_2)
print(product)

In your situation, it's not just that you know how the trick is played, but also the math on which the trick is based. Here is a pretty good explanation of that math: Math behind 21 Card Trick.

If it were me, I would start with a main list of all 21 cards, and first, second, third start as empty lists which could be filled at a later time (within a function), you need to deal the cards, display the cards, ask for user choice, collect the cards (each step 3 times), finally reveal the eleventh card.

To be honest, I can't help but feel that either your answer or perhaps some snippets from the assignment are based on the program by dylanfw on GH.