﻿ NumPy: Count the occurrence of a specified item in a given NumPy array - w3resource # NumPy: Count the occurrence of a specified item in a given NumPy array

## NumPy: Array Object Exercise-106 with Solution

Write a NumPy program to count the occurrence of a specified item in a given NumPy array.

Sample Solution:

Python Code:

``````import numpy as np
nums = np.array([10, 20, 20, 20, 20, 0, 20, 30, 30, 30, 0, 0, 20, 20, 0])
print("Original array:")
print(nums)
print(np.count_nonzero(nums == 10))
print(np.count_nonzero(nums == 20))
print(np.count_nonzero(nums == 30))
print(np.count_nonzero(nums == 0))
```
```

Sample Output:

```Original array:
[10 20 20 20 20  0 20 30 30 30  0  0 20 20  0]
1
7
3
4
```

Pictorial Presentation: Python Code Editor:

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## Python: Tips of the Day

Set comprehension:

```>>> m = {x ** 2 for x in range(5)}
>>> m
{0, 1, 4, 9, 16}
```