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CBSE Class 12 Computer Science Question 86 of 105

Python Revision Tour II — Question 13

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13
Question

Question 6

Assuming words is a valid list of words, the program below tries to print the list in reverse. Does it have an error ? If so, why ? (Hint. There are two problems with the code.)

for i in range(len(words), 0, -1):
    print(words[i], end=' ')
Answer

There are two issue in range(len(words), 0, -1):

  1. The start index len(words) is invalid for the list words as it will have indexes from 0 to len(words) - 1.
  2. The end index being 0 means that the last element of the list is missed as the list will be iterated till index 1 only.

The corrected python code is :

for i in range(len(words)-1, -1, -1):
    print(words[i], end=' ')