CODEWITHSUNDEEP
pythonfunctiongenerator
russel
russel

Reputation: 1

Cannot pass yield value to another function

I have these two functions:

def getItems(r, c):
     **do something**
     **find and yield four values a, b, c, d**
     yield (a,b,c,d)

def mainfunction(data): 
     reader = csv.reader(records)
     for row in reader:
         a,b,c,d = getItems(row, c)
     yield (a,b,c,d)

However, when I run the file, I keep getting an error :

a, b, c, d = getItems(r, c)
ValueError: not enough values to unpack (expected 5, got 1)

I'm not sure how to proceed with this!

Upvotes: 0

Views: 269

Answers (1)

Masklinn
Masklinn

Reputation: 42282

yield converts the function to a generator, each yield being one item of the iterator. The tuple is an other item. So your getItem returns an iterable (~sequence) of tuples, even if it only yields one tuple, it's still an iterator of tuples.

Just replace the yield by return. Or if there's an actual reason for it to be there, you need to iterate the result of getItem.

You could also yield the individual values such that getItem() is an iterable of 4 elements but that doesn't seem very useful.

Upvotes: 2

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