Syntactic error during the print of a class properties-CodePudding

It has been created a class which describes a person (name, address etc.). .It must be printing all the properties whichThe code it is in the follow lines

class Person:
    personNo=0
    def _init_(unit,first_name,last_name,age,address):
            unit.personsfirstname=first_name
            unit.lastname=last_name
            unit.personsage=age
            unit.address=address
            unit.personNo =1
    def ShowInfo(unit):
            print("Ονομα: " unit.personsfirstname  "Επιθετο: " unit.lastname  "Ηλικια: " unit.personsage  "Οδος: " unit.address=address)#The problem is here
            


person1=Person("George","Stefanopoulos","55","Alpha street 33")
person2=Person("Μαρια","Πενταγιωτισα","25","Παπαλαμπρενας 28")

So, when the code is executed it is appeared error: expression can not contain assignment perhaps you meant "=="? .The problem it is appeared where is located the note. It must be noted that this code is based another example code which works perfectly

CodePudding user response：

First of all, the constructor should be __init__ and not _init_
Second, you have an = inside the print function where you try to create the output string.
I suggest to use __str__ method:

class Person:
    personNo=0
    def __init__(self,first_name,last_name,age,address):
            self.personsfirstname=first_name
            self.lastname=last_name
            self.personsage=age
            self.address=address
            self.personNo =1

    def __str__(self):
            s = "Ονομα: " self.personsfirstname  " Επιθετο: " self.lastname  " Ηλικια: " self.personsage  " Οδος: " self.address
            return s
            


person1=Person("George","Stefanopoulos","55","Alpha street 33")
person2=Person("Μαρια","Πενταγιωτισα","25","Παπαλαμπρενας 28")

# thanks to __str__ method, you can do:
print(person1)
Ονομα: George Επιθετο: Stefanopoulos Ηλικια: 55Ο δος: Alpha street 33
print(person2)
Ονομα: Μαρια Επιθετο: Πενταγιωτισα Ηλικια: 25Οδος: Παπαλαμπρενας 28

CodePudding user response：

= is used to assign value.

Supposing you want to display the address as you did for the name, try like this:

class Person:
    personNo=0
    def __init__(unit,first_name,last_name,age,address):
            unit.personsfirstname=first_name
            unit.lastname=last_name
            unit.personsage=age
            unit.address=address
            unit.personNo =1
    def ShowInfo(unit):
            print("Ονομα: " unit.personsfirstname  "Επιθετο: " unit.lastname  "Ηλικια: " unit.personsage  "Οδος: "  unit.address)
            


person1=Person("George","Stefanopoulos","55","Alpha street 33")
person2=Person("Μαρια","Πενταγιωτισα","25","Παπαλαμπρενας 28")

If you want to simply return True or False for address, but not sure why would you do that, do this:

class Person:
    personNo=0
    def __init__(unit,first_name,last_name,age,address):
            unit.personsfirstname=first_name
            unit.lastname=last_name
            unit.personsage=age
            unit.address=address
            unit.personNo =1
    def ShowInfo(unit):
            print("Ονομα: " unit.personsfirstname  "Επιθετο: " unit.lastname  "Ηλικια: " unit.personsage  "Οδος: " str(unit.address==address))
            


person1=Person("George","Stefanopoulos","55","Alpha street 33")
person2=Person("Μαρια","Πενταγιωτισα","25","Παπαλαμπρενας 28")

Also, you used _init_ and the constructor can be defined using __init__.
Not having the right way declared constructor, you're getting an error for trying to create a new instance of class Person with some arguments. Your function _init_ is a normal method of the class.