# numpy string operations | isdigit() function

`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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