Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python

Mark Chang
Mark Chang
5,214 Points

Python Tuple: ValueError too many values to unpack (expected 4)

I tried to use a tuple to record the statistics of the twitch top streamer, but it appears the value error. Despite the fact that I checked for several times, I couldn't discover the problem. I would be grateful to anyone who answered my question. Additionally, how people pronounce the word "Tuple"? Thanks.

my code:

streamers = input("Enter a streamer's name") 
tp = ("shroud", "chocotaco", "just9n", "Lurn", "wadu", "DrDisrespect")
tp [2:6:1]
shroud = ("shroud", "10,037", "6,473,519", "63,119")
chocotaco = ("chocotaco", "4,863", "817,166", "12,924")
just9n = ("just9n", "Unknown", "331,000", "9,887")
name, paid_subscribers, followers, peak_viewers = streamers
name, paid_subscribers, followers, peak_viewers 

result:

Enter a streamer's name: shroud
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
     10 chocotaco = ("chocotaco", "4,863", "817,166", "12,924")
     11 just9n = ("just9n", "Unknown", "331,000", "9,887")
---> 12 name, paid_subscribers, followers, peak_viewers = streamers
     13 name, paid_subscribers, followers, peak_viewers

ValueError: too many values to unpack (expected 4)

1 Answer

Jeff Muday
MOD
Jeff Muday
Treehouse Moderator 28,717 Points

The error message "too many values to unpack" happens when you tried to pull out more elements from the tuple than existed.

# note The input() function only returns ONE string.
streamers = input("Enter a streamer's name") 

# so this will throw an error, because streamers ONLY has one string, not the 4 strings you attempt to assign
name, paid_subscribers, followers, peak_viewers = streamers

Here is a program that loops through a list of streamers asks the user to enter a name and it searches the list and unpacks into the four variables

# here is a list of tuples.
# each tuple stands for a particular streamer
streamers = [
    ("shroud", "10,037", "6,473,519", "63,119"),
    ("chocotaco", "4,863", "817,166", "12,924"),
    ("just9n", "Unknown", "331,000", "9,887")
]

while True:
    found = False
    user_input = input("Enter a streamer's name (or quit): ")
    if user_input == 'quit':
        break
    for streamer in streamers:
        # we can unpack the four values from the tuple here.
        name, paid_subscribers, followers, peak_viewers = streamer
        # check if the name matched the user_input
        if name == user_input:
            # ok, the name matched, print it out.
            found == True
            # show the streamer
            print("Name: ", name)
            print("Paid Subscribers: ", paid_subscribers)
            print("Followers: ", followers)
            print("Peak viewers: ", peak_viewers)

    if not found:
        print("name not found.")

So, if you wanted to put in several values look at this example

streamers = []

while True:
    print("Enter the data for a streamer, separate each value with a space or type quit")
    print("name  paid_subscribers  followers  peak_viewers")
    user_input = input("> ")
    if user_input == "quit":
        break
    user_tuple = tuple(user_input.split())
    streamers.append(user_tuple)
    for streamer in streamers:
        print(streamer)