Author -  Sai gowtham

# How to check if multiple variables are not None in Python

In this tutorial, we are going to learn about how to check if a multiple variables are not none in Python with the help of examples.

Note: Not None means there is some data stored inside the variables.

Consider, that we have the following variables in our code:

``````x = 1
y = 2
z = 3``````

Now, we need to check the above variables are not None.

## Checking if multiple variables are not None

To check if multiple variables are not None, we can use the built-in `all()` function in Python.

The `all()` function returns True if all items in the iterable are true. Otherwise, it returns false.

Here is an example:

``````
x = 1
y = 2
z = 3

if all(item is not None for item in [x, y, z]):
print('Multiple variables are not None')
else:
print('Some of the variables are None')``````

Output:

``'Multiple variables are not None'``

In the above code,

1. We have first added the variables into the list.

2. Then iterated over the list using `in` operator.

3. On each iteration, we have checked if the `item is not None`.

Finally, the `all()` function returns `True` if the all items in the list returns true, otherwise false is returned.

If it returns `True` then it should prints the `Multiple variables are not None`, if at least one of the variables is None then it returns `False` and prints `Some of the variables are None`.

Example 2: Some of the variables are none

``````
x = 1
y = 2
z = None

if all(item is not None for item in [x, y, z]):
print('Multiple variables are not None')
else:
print('Some of the variables are None')
``````

Output:

``'Some of the variables are None'``

In the above code, it prints “Some of the variables are None” because the variable `z` is assigned to None.

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