Question

I have tried to assign new data to existing tuple, and it does not work.and actually I want to add the a and b to get a sum, however only string can be iterated..

A=[('3', '4'), ('3', '11'), ('8', '10')] 
  print A
for a,b in A:
  a,b = int(a), int(b)+int(a)
print A

results:

[(‘3’, ‘4’), (‘3′, ’11’), (‘8′, ’10’)]

[(‘3’, ‘4’), (‘3′, ’11’), (‘8′, ’10’)]

Answer 1

When you set a, b = int(a), int(b)+int(a), you do not change the actual object a and b came from; you just bind new objects the variables a and b…

You can create a new list B, and populate it:

A=[('3', '4'), ('3', '11'), ('8', '10')] 
print A
B = []
for a, b in A:
    B.append((int(a), int(b) + int(a)))
print B