Python NumPy Array Data Type

Question

import numpy as np  

d=np.dtype([('name',np.str_),('salary',np.int64)])  
arr = np.array([('Vedant',80000),('Subodh',4000)],dtype=d)  
print(arr)

Output:

[('', 80000) ('',  4000)]

Why are the strings blank?

Asked By: Vedant Bhosale

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Source

Answer 1

You need to set how many chars you want to insert. ('name',np.str_, 4) this expect each word has only four chars. Or use ('name','U10') for considering ten chars, ('name','U18') for considering 18 chars without specifying.

import numpy as np  

d=np.dtype([('name',np.str_, 4),('salary',np.int64)])  

# we can define dtype like below without specifying the length of words
# BUT we should pay attention 'U10' only considers ten chars
# OR 'U18' for considering 18 chars
# d=np.dtype([('name','U10'),('salary',np.int64)])  

arr = np.array([('abcde',80000),('Subodh',4000)],dtype=d)  
print(arr)  
# [('abcd', 80000) ('Subo',  4000)]
# skip 'e' from 'abcde'
# skip 'dh' from 'Subodh'

Answered By: I'mahdi

Python NumPy Array Data Type

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