We all have seen underscore symbol in Python. One of the most common uses of the underscore is as a placeholder variable. When iterating over a sequence or generating a range of values, there are often situations where the loop variable is not needed. In such cases, Python programmers opt to use _ as a concise way to indicate that the value is irrelevant to the current context.

for _ in range(10):

Here, _ acts as a placeholder for the loop variable, highlighting the intent to iterate a specific number of times without the need to reference the loop index.

Moreover, _ serves as a convention for denoting unused variables. In scenarios where only one value from a function call or tuple unpacking is required, Python programmers often assign the unused value to _, signaling to others that the value is intentionally disregarded.

first_name, _ = get_name()

This will return multiple parameters but we ignore other parameters except first_name.

>>> 1 + 2 + 3
>>> _ * 5

Here underscore saves the value of last expression ie. 1+2+3=5

In short, Underscore _ can be used as a placeholder, unused variable indicator or temporary result storage. It makes our code readable and expressive. Happy Code Writing!