How To Use Python all() & any() Function With Examples

The all() function in Python returns True if all elements in an iterable are true, and False otherwise. It takes an iterable as its argument and returns a boolean value. The any() function in Python returns True if at least one element in an iterable is true, and False otherwise. It takes an iterable as its argument and returns a boolean value also. This article will tell you how to use these 2 functions with examples.

1. Python all() Function.

1.1 Python all() Function Syntax.

1. Here is the syntax for the all() function.

   all(iterable)

2. The iterable argument is any iterable object such as a list, tuple, set, or dictionary.

1.2 Python all() Function Examples.

1. Here are some examples of using the all() function.
2. Example 1: Check if all elements in a list are even.

   >>> my_list = [2, 4, 6, 8]
   >>>
   >>> result = all(x %2 == 0 for x in my_list)
   >>>
   >>> print(result)
   True
   >>>
   >>> my_list = [1, 2, 4, 6, 8]
   >>>
   >>> result = all(x %2 == 0 for x in my_list)
   >>>
   >>> print(result)
   False
   

3. Example 2: Check if all elements in a tuple are strings.

   >>> my_tuple = ("apple", "banana", "cherry")
   >>>
   >>> result = all(isinstance(x, str) for x in my_tuple)
   >>>
   >>> print(result)
   True
   >>>
   >>> my_tuple = (1, 2, "apple", "banana", "cherry")
   >>>
   >>> result = all(isinstance(x, str) for x in my_tuple)
   >>>
   >>> print(result)
   False

4. Example 3: Check if all elements in a dictionary are positive.

   >>> my_dict = {"a": 5, "b": 10, "c": -3}
   >>>
   >>> result = all(x > 0 for x in my_dict.values())
   >>>
   >>> print(result)
   False

5. Example 4: Check if all elements in a list are non-empty strings.

   >>> my_list = ["hello", "world", "", "python"]
   >>>
   >>> result = all(my_list)
   >>>
   >>> print(result) # Empty strings evaluate to False
   False
   >>> result = all(x for x in my_list if x) # Using a filter to remove empty strings
   >>>
   >>> print(result)
   True

6. Example 5: Check if all elements in a list of lists have the same length.

   >>> my_list = [[1, 2, 3], [4, 5], [6, 7, 8, 9]]
   >>>
   >>> result = all(len(x) == len(my_list[0]) for x in my_list)
   >>>
   >>> print(result)
   False
   >>>
   >>> my_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
   >>>
   >>> result = all(len(x) == len(my_list[0]) for x in my_list)
   >>>
   >>> print(result)
   True

7. Example 6: Check if all elements in a list of tuples satisfy a condition.

   >>> my_list = [("apple", 5), ("banana", 10), ("cherry", 3)]
   >>>
   >>> result = all(x[1] > 0 for x in my_list) # each x is a tuple in the list, x[1] is the number in the tuple.
   >>>
   >>> print(result)
   True
   >>>
   >>> result = all(x[0].startswith("a") for x in my_list) # x[0] is the string in the tuple.
   >>>
   >>> print(result)
   False

2. Python any() Function.

2.1 Python any() Function Syntax.

1. The any() function in Python returns True if at least one element in an iterable is true, and False otherwise. It takes an iterable as its argument and returns a boolean value.
2. Here is the syntax for the any() function.

   any(iterable)

3. The iterable argument is any iterable object such as a list, tuple, set, or dictionary.

2.2 Python any() Function Examples.

1. Here are some examples of using the any() function.
2. Example 1: Check if any element in a list is even.

   >>> my_list = [1, 3, 5, 7, 8, 9]
   >>>
   >>> result = any(x % 2 == 0 for x in my_list)
   >>>
   >>> print(result)
   True

3. Example 2: Check if any element in a tuple is a string.

   >>> my_tuple = (2, True, [1, 2], "hello")
   >>>
   >>> result = any(isinstance(x, str) for x in my_tuple)
   >>>
   >>> print(result)
   True

4. Example 3: Check if any element in a dictionary is negative.

   >>> my_dict = {"a": 5, "b": 10, "c": -3}
   >>>
   >>> result = any(x < 0 for x in my_dict.values())
   >>>
   >>> print(result)
   True

5. Example 4: Check if any element in a set is a prime number.

   # prime number is the nature number that can only be whole divided by 1 and itself.
   >>> def is_prime(num):
   ...     if num < 2:
   ...         return False
   ...     for i in range(2, int(num ** 0.5) + 1):
   ...         if num % 2 == 0:
   ...             return False
   ...     return True
   ...
   >>> my_set = {4, 7, 10, 13}
   >>>
   >>> result = any(is_prime(x) for x in my_set)
   >>>
   >>> print(result)
   True
   >>> result = all(is_prime(x) for x in my_set)
   >>>
   >>> print(result)
   False

6. Example 5: Check if any element in a list of lists is empty.

   >>> my_list = [[1, 2, 3], [4, 5], [], [6, 7, 8, 9]]
   >>>
   >>> result = any(not x for x in my_list)
   >>>
   >>> print(result)
   True