The parameters of Python process are passed as values

The process should open up new space Therefore, value transmission is reasonable

python The parameter transfer must be “ Pass object reference ” The way . This method is equivalent to a combination of value passing and reference passing . If the function receives
An immutable object （ Numbers 、 Characters or tuples ） References to , You can't modify the original object directly – Equivalent to passing ‘ Value passed ’ To transfer objects . If the letter
The number received is a variable object （ Dictionaries 、 list ） References to , You can change the original value of the object – amount to ‘ The reference ’ To transfer objects .

Immutable objects are hashable ：int,str,Bool,tuple
Mutable objects are not hashable ： Use hash Function will report an error list、dict、set

So the function object is hashable 、 Immutable The parameters of the process are also tuple types and value passing