﻿ NumPy: Extract all the rows from a given array where a specific column starts with a given character - w3resource # NumPy: Extract all the rows from a given array where a specific column starts with a given character

## NumPy: Array Object Exercise-204 with Solution

Write a NumPy program to extract all the rows from a given array where a specific column starts with a given character.

Sample array:
[['01' 'V' 'Debby Pramod']
['02' 'V' 'Artemiy Ellie']
['03' 'V' 'Baptist Kamal']
['04' 'V' 'Lavanya Davide']
['05' 'V' 'Fulton Antwan']
['06' 'V' 'Euanthe Sandeep']
['07' 'V' 'Endzela Sanda']
['08' 'V' 'Victoire Waman']
['09' 'V' 'Briar Nur']
['10' 'V' 'Rose Lykos']]

Sample Solution:

Python Code:

``````import numpy as np
np.set_printoptions(linewidth=100)
student =  np.array([['01', 'V', 'Debby Pramod'],
['02', 'V', 'Artemiy Ellie'],
['03', 'V', 'Baptist Kamal'],
['04', 'V', 'Lavanya Davide'],
['05', 'V', 'Fulton Antwan'],
['06', 'V', 'Euanthe Sandeep'],
['07', 'V', 'Endzela Sanda'],
['08', 'V', 'Victoire Waman'],
['09', 'V', 'Briar Nur'],
['10', 'V', 'Rose Lykos']])
print("Original array:")
print(student)
char='E'
result = student[np.char.startswith(student[:,2], char)]
print("\nStudent name starting with",char,":")
print(result)
char='1'
result = student[np.char.startswith(student[:,0], char)]
print("\nStudent id starting with",char,":")
print(result)
```
```

Sample Output:

```Original array:
[['01' 'V' 'Debby Pramod']
['02' 'V' 'Artemiy Ellie']
['03' 'V' 'Baptist Kamal']
['04' 'V' 'Lavanya Davide']
['05' 'V' 'Fulton Antwan']
['06' 'V' 'Euanthe Sandeep']
['07' 'V' 'Endzela Sanda']
['08' 'V' 'Victoire Waman']
['09' 'V' 'Briar Nur']
['10' 'V' 'Rose Lykos']]

Student name starting with E :
[['06' 'V' 'Euanthe Sandeep']
['07' 'V' 'Endzela Sanda']]

Student id starting with 1 :
[['10' 'V' 'Rose Lykos']]
```

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}
```