Sample Paper on Python Programming

Which of the following functions will return the string with every ‘P’ replaced with a ‘z’ ?

• find()

• index()

• replace()

• split()

Answer explanation

The correct function is 'replace()' because it is specifically designed to replace occurrences of a specified substring in a string with another substring. In this case, it will replace every 'P' with 'z'.

The elements of a list are arranged in descending order. Which of the following two will give same outputs?

• print(list_name.sort())

• print(max(list_name))

• print(list_name.reverse())

• print(list_name[-1])

Answer explanation

In a descending ordered list, 'print(max(list_name))' returns the first element (largest), while 'print(list_name[-1])' returns the last element (smallest). Thus, 'print(max(list_name))' is the only correct choice that gives the same output.

Which of the following is/ are not legal string operators?

• in

• +

• *

• /

Answer explanation

The 'in' operator checks for membership in a collection, not a string operation. The '+' operator concatenates strings, '*' is used for repetition, and '/' is not a string operator. Thus, 'in' is the only non-legal string operator.

Assertion(A): Assigning a list name to a new name does not create a true copy of a list rather it just creates an alias. Reasoning(R): An alias simple refers to the old list with a new name, while a true copy creates a new list with a different memory location.

• Both A and R are true and R is the correct explanation for A

• Both A and R are true and R is not the correct explanation for A

• A is True but R is False

• A is false but R is True

Answer explanation

Both the assertion and reasoning are true. The assertion correctly states that assigning a list to a new name creates an alias, and the reasoning explains that an alias refers to the same memory location, confirming the assertion.

Assertion (A): String slices and substring both are extracted subparts of a string. Reasoning(R): String slices and substrings mean the same.

• Both A and R are true and R is the correct explanation for A

• Both A and R are true and R is not the correct explanation for A

• A is True but R is False

• A is false but R is True

Answer explanation

Assertion A is true as both string slices and substrings are parts of a string. However, reasoning R is false because string slices and substrings are not the same; slices can include a range, while substrings are contiguous characters.

Given a string S, write expressions to print i. First five characters of S ii. Ninth characters of S iii. Reversed S iv. Alternate characters from reversed S OR What is the difference between sort and sorted function in list.

Answer explanation

To extract parts of string S: i. S[:5] for first five characters, ii. S[8] for the ninth character, iii. S[::-1] for reversed S, iv. S[::-2] for alternate characters from reversed S. For sorting, 'sort()' modifies the list in place, while 'sorted()' returns a new sorted list.

What is the difference between split() and partition () functions?

Answer explanation

The split() function divides a string into a list based on a specified delimiter, while partition() splits a string into a tuple of three parts: the part before the delimiter, the delimiter itself, and the part after.

Predict an output of the following: x=’hello world’ print(x[:2],x[:-2],x[-2:]) print(x[6],x[2:4]) print(x[2:-3],x[-4:-2]) OR Predict an output of the following: my_lst:-[‘p’,’r’,’o’,’b’,’l’,’e’,’m’] my_lst[2:3]=[] print(my_lst) my_lst[2:5]=[] print(my_lst)

Answer explanation

For the first part, the output is ('he', 'hello wor', 'ld') 'w' 'lo' 'llo' 'rl'. For the second part, after removing elements, the output is ['p', 'r', 'l', 'e', 'm'] and then ['p', 'r', 'm']. The first part is correct.

An index out of bounds given with a list name causes error, but not with a list slices. Why?

Answer explanation

An index out of bounds error occurs when trying to access an element outside the list's range. However, list slices handle out-of-bounds indices gracefully by returning an empty list instead of raising an error.

Start with the list [8,9,10]. Do the following using list functions a. Remove the second entry from the list b. Double the list c. Add 4,5 and 6 to the end of the list d. Sort the list

Answer explanation

Start with [8,9,10]. Remove 9 to get [8,10]. Doubling gives [8,10,8,10]. Adding 4,5,6 results in [8,10,8,10,4,5,6]. Sorting the list gives [4,5,6,8,8,10,10].