Python beginner (1) identifier and python beginner's identifier

Python beginner (1) identifier and python beginner's identifier

Python identifier

In python, an identifier consists of letters, numbers, and underscores;

The identifiers in python are case sensitive;

1) class attributes that cannot be directly accessed starting with a single underscore (_ foo), which must be accessed through the interface provided by the class, and cannot be imported using "from xxx import;

2) The (_ foo) prefixed by double-downlink partitioning represents the private member of the class;

3) The (_ foo _) that begins and ends with a double-downlink delimiter represents the Special identifier for special methods in python. For example, _ init _ () represents the constructor of the class.