What is property injection?

Question

Python

dependency injection is divided into 3 types:
1. constructor injection. in this case, the dependency is passed through the class constructor and then assigned to the class property

class A:
  def __init__(self, logger):
    self.logger = logger

2. method injection. in this case, the dependency is passed through the class method and is not needed in the bolt? In most cases, it is not assigned to a property of the class, but is assigned to a local variable of the method

class A:
  def set_logger(self, logger):
    logger_obj = logger
    logger_obj.write('blabla')

3. but with the third view, I don’t understand everything. Please help me understand what it is and, if possible, also give a small piece of code.
In general, for python, this type of dependency injection exists, or due to the peculiarities of the language, it is simple

Answer 1

Changing the public variable in which the embedded object lies. More precisely, the replacement of this object.

a = new A();
a.logger = new Logger();

In fact, of the three methods, constructor injection is preferable.