text.isdigit()

The `isdigit()` method is a built-in string method in Python that returns `True` if all characters in a string are digits (0-9). If the string contains any non-digit characters, it returns `False`.

Example usage:

text = "1234"
print(text.isdigit())   # Output: True

text = "1234abc"
print(text.isdigit())   # Output: False

text = "1 2 3 4"
print(text.isdigit())   # Output: False

In the first example, `text` contains only digits, so `isdigit()` returns `True`. In the second example, `text` contains non-digit characters ('a', 'b', and 'c'), so `isdigit()` returns `False`. In the third example, `text` contains spaces, which are also non-digit characters, so `isdigit()` returns `False`.