# numpy string operations | isdigit() function

• Last Updated : 14 Jan, 2019

`numpy.core.defchararray.isdigit(arr)` function returns True for each element if all characters in the string are digits and there is at least one character; returns false otherwise.

Parameters:
arr : array_like of str or unicode.

Returns : [ndarray] Output array of bools.

Code #1 :

 `# Python program explaining``# numpy.char.isdigit() method `` ` `import` `numpy as geek`` ` `# input array contains only digits``in_arr ``=` `geek.array([ ``'1000'``, ``'2000'``] )``print` `(``"Input array : "``, in_arr) `` ` `out_arr ``=` `geek.char.isdigit(in_arr)``print` `(``"Output array: "``, out_arr)`
Output:
```Input array :  ['1000' '2000']
Output array:  [ True  True]
```

Code #2 :

 `# Python program explaining``# numpy.char.isdigit() method `` ` `import` `numpy as geek`` ` `# input array contains digits along with space and alphabets``in_arr ``=` `geek.array([ ``'1000 2'``, ``'a1000'``, ``'1234 ab'``] )``print` `(``"Input array : "``, in_arr) `` ` `out_arr ``=` `geek.char.isdigit(in_arr)``print` `(``"Output array: "``, out_arr)`
Output:
```Input array :  ['1000 2' 'a1000' '1234 ab']
Output array:  [False False False]
```

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