Why it shows Error

Question

It says int argument must be applied on a string not a list but in the code its not a list its a determined element in the list

x=input("Enter claculation OP here\n")
OP_list=[]

for i in range(0, len(x)):
OP_list.append(x[i])
i+=1

if "+" in OP_list:
d1=OP_list.index("+")
d2=d1+1
result=int(OP_list[:d1])+int(OP_list[d2:])
print(result )
else :
print("invalid")

Answer 1

Why do you say it's not a list? You implement it as a list not a string since you do OP_list = []. So basically it's a list of strings. Because that's a list, you need to convert it to an actual string. It could be done using str.join().
result=int(''.join(OP_list[:d1]))+int(''.join(OP_list[d2:])) may be what you want.

Answer 2

Thank you

I'm still new to python and thought that slicing already convert it to a string but now I understand.
The join method is really helpful