Python Practice Problems

Python practice problems help beginners to become experts in a python programming language with a small amount of practice effort.

Five standard normal numbers

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Python Practice › NumPy Programs › Program 22

Five standard normal numbers

EasyNumPy Programs · 22 of 100

Write a NumPy program to generate 5 random numbers from a standard normal distribution.

Output
[ 0.001  0.299 -0.274 -0.891 -0.455]

Approach

  1. rng.standard_normal(5).

Solution

Python
import numpy as nprng = np.random.default_rng(7)print(rng.standard_normal(5).round(3))
Output
[ 0.001  0.299 -0.274 -0.891 -0.455]

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Random numbers between 1 and 2

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Python Practice › NumPy Programs › Program 21

Random numbers between 1 and 2

EasyNumPy Programs · 21 of 100

Write a NumPy program to generate random numbers between 1 and 2.

Output
[1.774 1.439 1.859 1.697 1.094]

Approach

  1. rng.uniform(1, 2, size) with a seeded generator.

Solution

Python
import numpy as nprng = np.random.default_rng(42)print(rng.uniform(1, 2, 5).round(3))
Output
[1.774 1.439 1.859 1.697 1.094]

Line by line

Line 2

The seed makes the numbers repeatable.

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3 × 3 identity matrix

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Python Practice › NumPy Programs › Program 20

3 × 3 identity matrix

EasyNumPy Programs · 20 of 100

Write a NumPy program to create a 3 × 3 identity matrix.

Output
[[1 0 0]
 [0 1 0]
 [0 0 1]]

Approach

  1. np.eye(3).

Solution

Python
import numpy as npprint(np.eye(3, dtype=int))
Output
[[1 0 0]
 [0 1 0]
 [0 0 1]]

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More numpy programs

#21EasyRandom numbers between 1 and 2#22EasyFive standard normal numbers#23EasyVector from 1 to 20#24EasyAll values except 20

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3 × 3 matrix

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Python Practice › NumPy Programs › Program 19

3 × 3 matrix

EasyNumPy Programs · 19 of 100

Write a NumPy program to create a 3 × 3 matrix.

Output
[[1 2 3]
 [4 5 6]
 [7 8 9]]

Approach

  1. arange(9).reshape(3, 3).

Solution

Python
import numpy as npprint(np.arange(1, 10).reshape(3, 3))
Output
[[1 2 3]
 [4 5 6]
 [7 8 9]]

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#20Easy3 × 3 identity matrix#21EasyRandom numbers between 1 and 2#22EasyFive standard normal numbers#23EasyVector from 1 to 20

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Integers 1 to 100 in steps of 6

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Python Practice › NumPy Programs › Program 18

Integers 1 to 100 in steps of 6

EasyNumPy Programs · 18 of 100

Write a NumPy program to create an array of integers from 1 to 100 with a difference of 6.

Output
[ 1  7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97]

Approach

  1. np.arange(1, 101, 6).

Solution

Python
import numpy as npprint(np.arange(1, 101, 6))
Output
[ 1  7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97]

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Odd integers from 1 to 20

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Python Practice › NumPy Programs › Program 17

Odd integers from 1 to 20

EasyNumPy Programs · 17 of 100

Write a NumPy program to create an array of odd integers from 1 to 20.

Output
[ 1  3  5  7  9 11 13 15 17 19]

Approach

  1. np.arange(1, 21, 2).

Solution

Python
import numpy as npprint(np.arange(1, 21, 2))
Output
[ 1  3  5  7  9 11 13 15 17 19]

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#18EasyIntegers 1 to 100 in steps of 6#19Easy3 × 3 matrix#20Easy3 × 3 identity matrix#21EasyRandom numbers between 1 and 2

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Even integers from 1 to 20

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Python Practice › NumPy Programs › Program 16

Even integers from 1 to 20

EasyNumPy Programs · 16 of 100

Write a NumPy program to create an array of even integers from 1 to 20.

Output
[ 2  4  6  8 10 12 14 16 18 20]

Approach

  1. np.arange(2, 21, 2).

Solution

Python
import numpy as npprint(np.arange(2, 21, 2))
Output
[ 2  4  6  8 10 12 14 16 18 20]

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#17EasyOdd integers from 1 to 20#18EasyIntegers 1 to 100 in steps of 6#19Easy3 × 3 matrix#20Easy3 × 3 identity matrix

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Integers from 1 to 20

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Python Practice › NumPy Programs › Program 15

Integers from 1 to 20

EasyNumPy Programs · 15 of 100

Write a NumPy program to create an array of integers from 1 to 20.

Output
[ 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20]

Approach

  1. np.arange(1, 21).

Solution

Python
import numpy as npprint(np.arange(1, 21))
Output
[ 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20]

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#16EasyEven integers from 1 to 20#17EasyOdd integers from 1 to 20#18EasyIntegers 1 to 100 in steps of 6#19Easy3 × 3 matrix

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Array of three ones

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Python Practice › NumPy Programs › Program 14

Array of three ones

EasyNumPy Programs · 14 of 100

Write a NumPy program to create an array of 3 ones.

Output
[1 1 1] [1. 1. 1.]

Approach

  1. np.ones(3, dtype=int).

Solution

Python
import numpy as npprint(np.ones(3, dtype=int), np.ones(3))
Output
[1 1 1] [1. 1. 1.]

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More numpy programs

#15EasyIntegers from 1 to 20#16EasyEven integers from 1 to 20#17EasyOdd integers from 1 to 20#18EasyIntegers 1 to 100 in steps of 6

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Memory used by an array

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Python Practice › NumPy Programs › Program 13

Memory used by an array

EasyNumPy Programs · 13 of 100

Write a NumPy program to find the memory occupied by an array.

Output
5 8 40

Approach

  1. nbytes = number of items × bytes per item.

Solution

Python
import numpy as nparr = np.array([10, 34, 86, 26, 56], dtype=np.int64)print(arr.size, arr.itemsize, arr.nbytes)
Output
5 8 40

Line by line

Line 2

The dtype is fixed to int64 so the size is the same on every platform.

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More numpy programs

#14EasyArray of three ones#15EasyIntegers from 1 to 20#16EasyEven integers from 1 to 20#17EasyOdd integers from 1 to 20

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