Python deserialize pickle

1  #If you need to process more complex data, use pickle. Pickle can only be used in Python, not other languages. 
2  #Serialization . 
3  import pickle
 4  def sayhi(name):
 5      print ( ' hello ' , name)
 6  
7 f = open( ' test.text ' , ' wb ' )
 8  
9 info = {
 10      ' name ' : ' alex ' ,
 11      ' age ' : 22 ,
 12     ' func ' : sayhi
 13  }
 14  
15 f.write(pickle.dumps(info))   # pickle will convert to binary by default, so the reading method should be wb instead of w. 
16  f.close()
 17  
18  
19  #Inverse Serialization 
20  import pickle
 21  def sayhi(name):
 22      print ( ' hello2 ' , name)   #Deserialize a different function (the name is the same, the method body is different), it's OK. ? If it has not been serialized, why Can be deserialized? 
 23  
24 f = open( ' test.text ' , ' rb ' )
 25 
26  
27 data = pickle.loads(f.read()) #Deserialization   . This will make an error, because the function sayhi will be released after it is used up, and the memory address will no longer exist. So this 
28  print (data)