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pythonlist-manipulation

Sum of only given index in a list with an another integer

I want to sum the particular index in this list

b = [3,4,6,8,9]
b[2:4] += 100
print(b)

When i try to execute i get:

b[2:4] += 100
TypeError: 'int' object is not iterable

The expected Output is:

[3,4,106,108,9]

Can anyone help me out to get me my expected output?

Solution

  • Use enumerate and list comprehension

    >>> b=[3,4,6,8,9]
>>> [e*100 if i in range(2,4) else e for i,e in enumerate(b)]
[3, 4, 600, 800, 9]