How to form dictionary with string and numpy array?

Question

How to interchange key-value pair of my dict where key is string and value is numpy array

word2index = {'think': array([[9.56090081e-05]]), 
              'apple':array([[0.00024469]])}

Now I need output like this

index2word = {array([[9.56090081e-05]]):'think', 
              array([[0.00024469]]):'apple'}

Not a good idea to have a list of array as a key in the dict. — DirtyBit
– DirtyBit, Commented Apr 2, 2019 at 9:30
You can't use mutables (such as numpy arrays) as dictionary keys. — Learning is a mess
– Learning is a mess, Commented Apr 2, 2019 at 9:38
@Sisekarthikeyan, you may consider accepting an answer that helped: meta.stackexchange.com/questions/5234/… cheers — DirtyBit
– DirtyBit, Commented Apr 9, 2019 at 12:01

DirtyBit · Accepted Answer · 2019-04-02 09:44:25Z

3

Why Lists Can't Be Dictionary Keys

To be used as a dictionary key, an object must support the hash function (e.g. through hash), equality comparison (e.g. through eq or cmp)

That said, the simple answer to why lists cannot be used as dictionary keys is that lists do not provide a valid hash method.

However, using a string representation of the list:

word2index = {'think': [9.56090081e-05], 'apple': [0.00024469]}
print({repr(v):k for k,v in word2index.items()})

OUTPUT:

{'[9.56090081e-05]': 'think', '[0.00024469]': 'apple'}

OR:

Converting the list to a tuple:

print({tuple(v):k for k,v in word2index.items()})

OUTPUT:

{(9.56090081e-05,): 'think', (0.00024469,): 'apple'}

edited Apr 2, 2019 at 9:44

answered Apr 2, 2019 at 9:37

DirtyBit

16.8k5 gold badges37 silver badges56 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Harsha Biyani Over a year ago

Agree for both solutions.

Amit Nanaware · Accepted Answer · 2019-04-02 09:32:43Z

0

I am not sure if we can set numpy array as dict key, but you can use below code to interchange the disct key and values:

index2word = {value:key for key, value in word2index.items()}

answered Apr 2, 2019 at 9:32

Amit Nanaware

3,3961 gold badge9 silver badges19 bronze badges

Collectives™ on Stack Overflow

How to form dictionary with string and numpy array?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related