ValueError: too many values to unpack

[m2babaey]

Hello all!
I think there are some people here to help me
Of course I did some search, similar topic (that I walked through) did not discuss for loops
My problem is this error: ValueError: too many values to unpack (in line 4)

I have a function for getting the average of a dictionary!
(sorry! new to python)
I have summarized the code and printed the variable sumPerYear so you can have a quick look:

def average(array):
    total=0.0
    size=len(array)
    for (name,item) in array:
        print item
        total=total+float(item)
 
    avg=total/size
    return avg
 
 
sumPerYear={'1999': 3723.18, '1995': 3999.05, '1997': 4225, '2005': 3946, '1991': 4191, '2003': 3862, '1993': 4377.27, '2001': 3509.27, '1998': 3738.64, '1994': 3952.5, '2004': 3905., '1996': 3859.59, '2002': 3865.77, '1990': 4172.64, '2000': 3853.36, '1992': 4708.95}
print(average(sumPerYear))

Many thanks for you help

[JDCyrus]

If you iterate over a dictionary, it will iterate over just the keys, not key-value tuples. You want to say "for name in array:" and then "print array[name]" and so forth. Alternatively, you could say "for (name, item) in array.items():" and then the rest of your code would work the way you want it to, since the dict.items method does return key-value tuples. The first way is more efficient, though.

EDIT: You can actually accomplish all of this much more efficiently and with a lot less code. Try this:

def average(array):
    return float(sum(array.values())) / len(array)