This tutorial will discuss about unique ways to check if numpy array contains only empty strings.

**Table Of Contents**

## Method 1: using numpy.char.str_len()

The `numpy`

module in Python provides a function `numpy.char.str_len()`

. It accepts a string array as an argument, and returns an array of integers. In the returned array, a value at the `ith`

index represents the size of string at the `ith`

index in passed string array.

So, to check if a Numpy Array contains only empty strings, we can pass the NumPy array to method `numpy.char.str_len()`

, and compare the returned array with zero. It will give a Boolean Array. In this array, each True value represents that the corresponding value in the original NumPy array is an empty string.

Then we can use the `numpy.all()`

method to check if boolean array has only True values or not. If it returns True, then it means original numpy array has empty strings only.

**Let’s see the complete example,**

import numpy as np # Create a NumPy Array arr = np.array(['', '', '']) # check if numpy array has empty strings if np.all(np.char.str_len(arr) == 0): print("The NumPy Array contains only empty strings") else: print("The NumPy Array does not contain only empty strings")

**Output**

### Frequently Asked:

- Check if a NumPy Array contains a specific string
- Check if any value in Numpy Array is negative in Python
- Check if NumPy Array contains only empty strings – Python
- Check if all elements in a NumPy Array are equal to value

The NumPy Array contains only empty strings

## Method 2: using all() method

Iterate over all strings of NumPy Array, and for each string check if its size is 0 or not. Do, all this in a generator expression, and it will give a boolean list. In this list, each True value represents that the corresponding value in the original numpy array is an empty string.

Then we can use the `all()`

method to check if boolean list has only True values or not. If it returns True, then it means original numpy array has empty strings only.

**Let’s see the complete example,**

import numpy as np # Create a NumPy Array arr = np.array(['', '', '']) # check if numpy array has empty strings if all(len(x) == 0 for x in arr): print("The NumPy Array contains only empty strings") else: print("The NumPy Array does not contain only empty strings")

**Output**

The NumPy Array contains only empty strings

## Summary

We learned about two different ways to check if a NumPy array has only empty strings in Python. Thanks.