A2 python basics_nptel_pds2_sol
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This document contains 20 multiple choice questions and answers related to Python for data science. It covers topics like tuples, lists, NumPy arrays, sets, dictionaries, sequence datatypes, and NumPy functions. The questions test concepts like immutable vs mutable arrays, indexing, sorting, joining arrays, data types allowed in sets vs lists, and using NumPy functions like np.full to create arrays.
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![NPTEL – PYTHON FOR DATA SCIENCE
ASSIGNMENT 2 – SOLUTION
1. Answer C: Tuples
Tuples is defined by enclosing the elements in parentheses ‘()’
2. Answer B: numpy arrays are immutable
Numpy Arrays are mutable, which means that you can change the value of an
element in the array after an array has been initialized.
3. Answer C: print (a[-1])
4. Answer D: x = np.arange(10); x[5::-2]
5. Answer C: 8,9,15
6. Answer C: extend()
extend () is the method used to increase the length of the list by number of
elements in its argument.
7. Answer A: np.argsort ()
np.argsort () returns the indices that would sort an array](https://image.slidesharecdn.com/a2pythonbasicsnptelpds2sol-200302092203/85/A2-python-basics_nptel_pds2_sol-1-320.jpg)
![8. Answer C: tuple[3] = 45
'tuple' object does not support item assignment
9. Answer A: len(N) & C: np.size(N)
10.Answer C: M = set([11,12],[13,14],[14,15])
11.Answer D: S={13,14}
12.Answer A: a | b
Union is performed using | operator in python
13.Answer B: Gives the number of axes or dimensions in the array
ndarray.ndim gives the number of axes or dimensions in the array
14.Answer C: d["oranges "] = 0.90](https://image.slidesharecdn.com/a2pythonbasicsnptelpds2sol-200302092203/85/A2-python-basics_nptel_pds2_sol-2-320.jpg)
![15.Answer D: all of the above
np.concatenate, np.hstack, and np.vstack help in joining arrays
16.Answer B: { 1: 2, '1': 2 }
17.Answer C: [0, 1, 4, 9]
18.Answer C: 8
19. Which of the following is not possible in sequence datatypes?
Answer B: Create a list inside a set
Create a list inside a set is not possible in sequence datatypes](https://image.slidesharecdn.com/a2pythonbasicsnptelpds2sol-200302092203/85/A2-python-basics_nptel_pds2_sol-3-320.jpg)
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If you find any useful images on the Internet, you can use them as long as you cite the source in
end notes.
Solution
Array is a collection of variables of the same type that are referenced by a common name.
Specific elements or variables in the array are accessed by means of index into the array.
If taking about C, In C all arrays consist of contiguous memory locations. The lowest address
corresponds to the first element in the array while the largest address corresponds to the last
element in the array.
C supports both single and multi-dimensional arrays.
1) Single Dimension Arrays:-
Syntax:- type var_name[size];
where type is the type of each element in the array, var_name is any valid identifier, and size is
the number of elements in the array which has to be a constant value.
*Array always use zero as index to first element.
The valid indices for array above are 0 .. 4, i.e. 0 .. number of elements - 1
For Example :- To load an array with values 0 .. 99
int x[100] ;
int i ;
for ( i = 0; i < 100; i++ )
x[i] = i ;
To determine to size of an array at run time the sizeof operator is used. This returns the size in
bytes of its argument. The name of the array is given as the operand
size_of_array = sizeof ( array_name ) ;
2) Initialisg array:-
Arrays can be initialised at time of declaration in the following manner.
type array[ size ] = { value list };
For Example :-
int i[5] = {1, 2, 3, 4, 5 } ;
i[0] = 1, i[1] = 2, etc.
The size specification in the declaration may be omitted which causes the compiler to count the
number of elements in the value list and allocate appropriate storage.
For Example :- int i[ ] = { 1, 2, 3, 4, 5 } ;
3) Multidimensional array:-
Multidimensional arrays of any dimension are possible in C but in practice only two or three
dimensional arrays are workable. The most common multidimensional array is a two
dimensional array for example the computer display, board games, a mathematical matrix etc.
Syntax :type name [ rows ] [ columns ] ;
For Example :- 2D array of dimension 2 X 3.
int d[ 2 ] [ 3 ] ;
A two dimensional array is actually an array of arrays, in the above case an array of two integer
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For Example :- Program to fill .
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A2 python basics_nptel_pds2_sol
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