What is the role of the _ operator in Python and in what situations is it used?

In Python, the underscore symbol _ is used in several contexts:

1. Ignoring a value — when you want to skip a value, for example, in unpacking or loops:

for _ in range(5):
    print("Hello")  # Loop variable is not important

x, _, y = (1, 2, 3)  # Ignoring the second element

2. Last computed expression in interactive mode — in REPL (e.g., in the Python interpreter), _ contains the result of the last operation:

>>> 10 + 5
15
>>> _ * 2
30

3. As a variable name for local or temporary values — underscore is often used to indicate that a variable is unimportant or temporary.

4. In international applications — sometimes _ is used as an alias for a translation function, for example, _('text').

Thus, _ is a convenient way to indicate that a value is not needed or to get the last result in interactive mode.