Why is this code giving an error?(ignoring indentation)

Question

def func(x):
for i in range(x):
yield i**2
print(",".join(list(func(3))))

Answer 1

just switch the yield statement to make it a string output. cant join numbers, but you can join strings

https://code.sololearn.com/cJl7YMIgbrSp/?ref=app

Answer 2

newstring = '-'.join(list)
listback = newstring.split('-')

Answer 3

can we also convert the list to string after generation?