How to initialize different variable types to null values in Python

Reference article Python, how to initialize different variable types to null values

Common numbers, characters, are simple and not much explained.
The list's value is in the form of [x, Y, z]
The value of the dictionary dictionary is the form of {x:a, y:b, z:c}
The values of tuple tuples are (a,b,c) in the form of

Therefore, variables of these data types are initialized to null values, respectively:

Numerical	Digital_value = 0
String	Str_value = "" or Str_value = "
List	List_value = []
Dictionary	Ditc_value = {}
Meta-group	Tuple_value = ()

How to initialize different variable types to null values in Python