Why do we need an empty string. Still confuses me (solved)

Question

def num_list():
num =""
for n in "3445":
num += n
yield num
print(list(num_list()))

output : ['3', '34', '344', '3445']

Answer 1

Because num=""
we are defining the data type for num
means num data type is a string not a number
string + string = stringstring
in our example
"3" + "4" = 34

Answer 2

Arinda Mark Alvin
Think of it as an empty container.

You can write code which will choose what goes into the container, so the end result will be a collection of items of your choice.

Answer 3

Ohh okay. Thanks