Error using a constructor in python 2.7

This problems as indicated by the error itself is because you are calling a module (file .py ) not a class, method or function contained in it. For example, Empleado in your case must be a class contained within the module called PracticaSSII.py

If your module is called Empleado.py and you try to do what you do, it throws that error at you. I do not know if this is your case, if not, I recommend you edit the question and add the full content of PracticaSSII and the structure of the folder where these files are to see if we can find out what is happening.

To clarify it a bit you should have the following structure:

• Within the same folder have the files PracticaSSII.py and the module where you call you have the function insertarSolicitud() , for my example I have called main.py .

• The content of PracticaSSII.py should be something like this:

  class Empleado():
      def __init__(self, nombre, apellidos, dni, edad, tipoEmpleo):
          self.nombre = nombre
          self.apellidos = apellidos
          self.dni = dni
          self.edad = edad
          self.tipoEmpleo = tipoEmpleo
  
  class Empresario():
      #Aquí va el contenido de la clase, al desconocerlo uso pass.
      pass
  

• The main.py (in your case I do not know what you call it) has the function insertarSolicitud , there are some changes since you use wrong pickle to serialize the data and that I explain now later:

  from PracticaSSII import Empleado
  from PracticaSSII import Empresario
  from pickle import dump, load
  
   def insertarSolicitud():
  
      #Esta parte pide por consola los datos al usuario que busca empleo
  
      nombre = raw_input("Introduce tu nombre:")
      apellidos = raw_input("Introduce tus apellidos: ")
      dni = raw_input("Introduce tu D.N.I: ")
      edad = raw_input("Introduce tu edad: ")
      empleo = raw_input("Que empleo buscas")
  
      nombreFichero = dni + '.dat'
  
      #Aqui abrimos el fichero en modo binario
      fichero = file(nombreFichero, 'wb')
  
      #En esta parte hacemos uso de pickle para serializar el objeto empleado y poder escribirlo como objeto
      empleadoAuxiliar = Empleado(nombre, apellidos, dni, edad, empleo) #Usamos el constructor
  
      # Usamos el modo de codificacion 1 por que es binario y por lo tanto mas efectivo
      dump(empleadoAuxiliar, fichero, 1)
      fichero.close()
  
      #Ahora ya tenemos el objeto empleadoAuxiliar guardado en el .dat
      #Si queremos obtener los datos usamos el metodo load de pickle
      #Abrimos el fichero en modo binario, en este caso se uso un dni 11111111A
  
      fichero = open('11111111A.dat', 'rb')
      datos = load(fichero)#lo cargamos en la variable datos con el metodo load
      fichero.close()
  
      #Ahora datos es la instancia de la clase Empleado de antes y podemos recuperar los datos (atributos de la clase):
      print 'Recuperando datos de objeto serializado:'
      print datos.nombre
      print datos.apellidos
      print datos.dni
      print datos.edad
      print datos.tipoEmpleo
  
  insertarSolicitud()
  

You can see the pickle documentation for more information if you want, the dump method pickle allows you to serialize a python object in a file, the first argument is the object in question (in your case EmpleadoAuxiliar ), the second the file where you will save it and the third the mode. If the mode is 1 or higher you should always open the files in binary mode .

The pickle.load method is not used to load the object in a file but to read a string or text file and return the original object, in your case it allows you to recover the employee data from .dat returning the original object .

Keeping all this in mind we can run the program, I leave a capture with the structure of the folder: