# Check if all values in a list are Zero in Python Last updated: Aug 12, 2022 Photo from Unsplash

## Check if all values in a list are Zero in Python#

Use the `all()` function to check if all values in a list are zero, e.g. `if all(item == 0 for item in my_list):`. The `all()` function will return `True` if all values in the list are zero and `False` otherwise.

main.py
```Copied!```my_list = [0, 0, 0]

if all(item == 0 for item in my_list):
# 👇️ this runs
print('All elements in the list are 0')
else:
print('Not all elements in the list are 0')

# 👇️ True
print(all(item == 0 for item in my_list))
``````

We used a generator expression to iterate over the list.

Generator expressions are used to perform some operation for every element or select a subset of elements that meet a condition.

On each iteration, we check if the current value is equal to `0` and return the result.

The all() built-in function takes an iterable as an argument and returns `True` if all elements in the iterable are truthy (or the iterable is empty).

main.py
```Copied!```my_list = [0, 0, 0]

# 👇️ True
print(all(item == 0 for item in my_list))
``````

If the `all()` function finds a non-zero value, it will short-circuit returning `False`.

Note that the `all()` function returns `True` for any condition if the passed in iterable is empty.
main.py
```Copied!```my_list = []

if all(item == 0 for item in my_list):
# 👇️ this runs
print('All elements in the list are 0')
else:
print('Not all elements in the list are 0')

# 👇️ True
print(all(item == 0 for item in my_list))
``````

If you consider an empty list one where not all values are `0`, check for the list's length.

main.py
```Copied!```my_list = []

if len(my_list) > 0 and all(item == 0 for item in my_list):
print('all elements in the list are 0')
else:
# 👇️ this runs
print('Not all elements in the list are 0')
``````
We used the `and` boolean operator, so for the `if` block to run, both conditions have to be met.

The `list` doesn't have a length greater than `0`, so the `else` block runs.

Alternatively, you can use the `list.count()` method.

To check if all values in a list are zero:

1. Use the `list.count()` method to count the `0` values in the list.
2. If the number of `0` values is equal to the list's length, all values in the list are `0`.
main.py
```Copied!```my_list = [0, 0, 0]

if my_list.count(0) == len(my_list):
# 👇️ this runs
print('All values in the list are equal to 0')
``````

The `list.count()` method takes a value and returns the number of times the provided value appears in the list.

main.py
```Copied!```my_list = [0, 0, 0]

print(my_list.count(0))  # 👉️ 3
``````

If the number of `0` values in the list is the same as the list's length, then the list contains only `0` values.

I wrote a book in which I share everything I know about how to become a better, more efficient programmer. You can use the search field on my Home Page to filter through all of my articles.