Why symbol (_) is used in python.what does it refer to and when should we use it

Answer 1

Generally, underscore symbol itself is just a placeholder. It means that if you do not want to use a true variable name to assign an unneeded value to, you can use '_'.
Like, if you assign variables with values from a list, this operation is valid (assuming you need only a and b variables to be set) :
a, _, b = 1, 99, 3
or
a, b, *_ = 1, 5, 7, 99, 56

Answer 2

In classes _ is used to indicate whether an object is public or private. A private object is depicted by, eg: _obj. Private object of a class can't be used outside the class.

Answer 3

thanks guys

Answer 4

In Python, the _ is generally reserved as a throwaway variable, which merely just indicates that whatever would usually be in its place should be ignored by the interpreter. Another use for it includes holding the place of the most recent input provided by the user
Here's a stackoverflow answer to this: https://stackoverflow.com/questions/5893163/what-is-the-purpose-of-the-single-underscore-variable-in-python?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa