convert string value to numpy array

Question

I want to pass csv data as argument in postman.

Which can be like

s = 2,3,4,5
s= "2,3,4,5"

This csv data is coming from some csv file. I can directly pas it like

localhost?data="2,3,4,5"

How to parse it correctly and convert it into numpy array?

I tried this

s = "2,3,4,5"
print(np.array(list(s)))

Which gives

['1' ',' '2' ',' '3' ',' '4']

which is wrong.

d =np.fromstring(s[1:-1],sep=' ').astype(int)

Gives array([], dtype=int64) which I dont understand.

What is the correct way?

print(np.array(s.split(",")).astype(int)) ?

Rakesh
– Rakesh

2019-04-22 11:49:47 +00:00
Commented Apr 22, 2019 at 11:49 — Rakesh
– Rakesh, Commented Apr 22, 2019 at 11:49

J...S · Accepted Answer · 2019-04-22 12:05:19Z

4

You could try np.fromstring() as in

import numpy as np
s = "2,3,4,5"
np.fromstring(s, dtype=int, sep=',')

to get output like

array([2, 3, 4, 5])

answered Apr 22, 2019 at 12:05

J...S

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Comments

Rakesh · Accepted Answer · 2019-04-22 12:12:05Z

2

You can split on comma and then use np.array

Ex:

import numpy as np

s = "2,3,4,5"
print(np.array(s.strip('"').split(",")).astype(int))

Output:

[2 3 4 5]

edited Apr 22, 2019 at 12:12

answered Apr 22, 2019 at 11:52

Rakesh

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2 Comments

user2129623 Over a year ago

Thanks bit it gives me data = np.array(data.split(",")).astype(int) ValueError: invalid literal for int() with base 10: '"1'

Rakesh Over a year ago

use .strip('"')

accdias · Accepted Answer · 2019-04-22 11:57:34Z

1

Here is another way:

>>> import numpy as np
>>> s='2,3,4,5'
>>> np.array([int(i) for i in s.split(',')])
array([2, 3, 4, 5])
>>>

answered Apr 22, 2019 at 11:57

accdias

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2 Comments

user2129623 Over a year ago

Thanks but it gives me data = np.array([int(i) for i in data.split(',')]) ValueError: invalid literal for int() with base 10: '"1'

accdias Over a year ago

What data have you used to test it? As you can see in the example above, for the string '2,3,4,5' it is working fine.

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