String Indexing in Python: Expression Evaluation

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Question:

What are the values of the following expressions?

In each line, assume that:

s = "Hello" t = "World"

s[1] + s[2]

Answer:

In Python, string indexing starts at 0. Given the string s = "Hello", the characters are indexed as follows:

  • s[0] = 'H'
  • s[1] = 'e'
  • s[2] = 'l'
  • s[3] = 'l'
  • s[4] = 'o'

Now, evaluating the expression s[1] + s[2]:

  • s[1] = 'e'
  • s[2] = 'l'

So, s[1] + s[2] results in:

'e' + 'l' = 'el'

Therefore, the value of the expression s[1] + s[2] is 'el'.