Is it possible to detect the presence of an array in Python code?

In Python, there is no built-in 'array' type like in other languages, but there are several ways to determine the presence of an array or a similar structure:

1. Lists (list) — the most common type for storing sequences.

2. Arrays from the array module — more compact, but with a restriction on element types.

3. NumPy arrays (numpy.ndarray) — used in scientific computing.

To determine if an object is an array, you can check its type or use isinstance:

import array
import numpy as np

def is_array(obj):
    return isinstance(obj, (list, array.array, np.ndarray))

print(is_array([1, 2, 3]))           # True
print(is_array(array.array('i', [1,2,3])))  # True
print(is_array(np.array([1,2,3])))   # True
print(is_array("string"))           # False

Thus, to check for an "array" in Python, you need to specify which data type is considered.