Remove Empty String From List and Array in Python

Methods to Remove Empty String From List

Using a list comprehension

# List
my_list = ["hello", "", "world", "", ""]

# Create a new list using a list comprehension that includes only non-empty strings
my_list = [x for x in my_list if x != ""]

print(my_list)

Output:

['hello', 'world']

Using the filter() function with a lambda function

# List
my_list = ["hello", "", "world", "", ""]

# Create a new list using the filter() function with a lambda function
my_list = list(filter(lambda x: x != "", my_list))

print(my_list)

Output:

['hello', 'world']

Using a for loop

# List
my_list = ["hello", "", "world", "", ""]

# Create a new list using a for loop that includes only non-empty strings
new_list = []
for x in my_list:
    if x != "":
        new_list.append(x)

print(new_list)

Output:

['hello', 'world']

Methods to Remove Empty String From Array

Using a list comprehension

import numpy as np

my_array = np.array(["hello", "", "world", "", ""]) # List

# Create a new numpy array using a list comprehension that includes only non-empty strings
my_array = np.array([x for x in my_array if x != ""])

print(my_array)

Output:

['hello' 'world']

Using the numpy delete() function

import numpy as np # pip install numpy

my_array = np.array(["hello", "", "world", "", ""]) # List

# Find the indices of the empty strings
indices = np.where(my_array == "")[0]

# Delete the elements with these indices using the numpy delete() function
my_array = np.delete(my_array, indices)

print(my_array)

Output:

['hello' 'world']

Using a for loop

import numpy as np

my_array = np.array(["hello", "", "world", "", ""])

# Create a new list using a for loop that includes only non-empty strings
new_array = np.array([])
for x in my_array:
    if x != "":
        new_array = np.append(new_array, x)

print(new_array)

Output:

['hello' 'world']