Solve 2+ Python Data Structures: Lists, Sets and Dictionaries previous year questions for GATE DA with answers and detailed solutions. Free sample questions below.
This chapter is about predicting the final state of Python data structures after a sequence of operations.
Focus on:
append, extend, insert, pop, remove, sort, reverse.+.+=.Focus on:
in.A, B = A - B, B - A.If you can answer these four questions, most list and set tracing problems become mechanical.
A Python list is an ordered collection. The position of each item matters, and the list can be changed after creation.
items = [10, 20, 30]| Property | Meaning |
|---|---|
| Ordered | [1, 2, 3] is different from [3, 2, 1] |
| Mutable | Elements can be changed, added, or removed |
| Duplicates allowed | [1, 1, 2] is valid |
| Indexed by position | First item is index 0, last is index -1 |
x = [10, 20, 30]
x[0] = 5 # replace item
x.append(40) # add one item at end
x.insert(1, 15) # insert at index 1
x.pop() # remove and return last item
x.remove(20) # remove first occurrence of 20
n = len(x) # lengthx = [10, 20, 30]
x[0] = 5
x.append(40)
x.insert(1, 15)| Step | Value of x |
|---|---|
| Start | [10, 20, 30] |
x[0] = 5 | [5, 20, 30] |
x.append(40) | [5, 20, 30, 40] |
x.insert(1, 15) | [5, 15, 20, 30, 40] |
The key idea is that the list changes in place. No new list is created by these operations.
A=[1,2,3] B=[4,5,6]
A={"this","that"}
B={"that","other"}
C={"other","this"}
while "other" in C:
if "this" in A:
A,B,C=A-B,B-C,C-A
if "that" in B:
A,B,C=C|A,A|B,B|C
Solve 2+ Python Data Structures: Lists, Sets and Dictionaries previous year questions for GATE DA with answers and detailed solutions. Free sample questions b
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