init missing 1 required positional argument

Question

I am trying to learn Python  This is a really simple code  All I am trying to do here is to call a class s constructor  Initialize some variables there and print that variable  But it is giving me an error  It is saying      missing 1 required positional argument   Here is my code   class DHT      def   init   self  data           self data  one      1          self data  two      2          self data  three      3      def showData self           print self data   if   name         main     DHT   showData

User · Answer

The problem is with  you  def   init   self  data     when you create object from DHT class you should pass parameter the data should be dict type  like  data   one  1  two  2  three  3  dhtObj DHT data    But in your code youshould to change is  data   one  1  two  2  three  3  if   name         main     DHT data  showData     Or  if   name         main     DHT   one  1  two  2  three  3   showData

User · Answer

You need to pass some data into it  An empty dictionary  for example   if   name         main     DHT  a   showData     However  in your example a parameter is not even needed  You can declare it by just   def   init   self     Maybe you mean to set it from the data   class DHT      def   init   self  data           self data  one     data  one           self data  two     data  two           self data  three     data  three       def showData self           print self data   if   name         main     DHT   one  2   two  4   three  5   showData     showData will print the data you just entered

User · Answer

You should possibly make data a keyword parameter with a default value of empty dictionary   class DHT      def   init   self  data dict             self data  one      1          self data  two      2          self data  three      3      def showData self           print self data   if   name         main          DHT   showData

User · Answer

If error is like Author models ForeignKey User  related names  blog posts   TypeError init    missing 1 required positional argument  on delete  Then the solution will be like  you have to add one argument Author models ForeignKey User  related names  blog posts   on delete models DO NOTHING

User · Answer

You re receiving this error because you did not pass a data variable to the DHT constructor   aIKid and Alexander s answers are nice but it wont work because you still have to initialize self data in the class constructor like this   class DHT     def   init   self  data None         if data is None           data            else           self data   data       self data  one      1        self data  two      2        self data  three      3     def showData self         print self data    And then calling the method showData like this   DHT   showData     Or like this   DHT   six  6  seven   7    showData     or like this     Build the class first dht   DHT   six  6  seven   7      The call whatever method you want  In our case only 1 method available  dht showData

User · Answer

Your constructor is expecting one parameter  data   You re not passing it in the call  I guess you wanted to initialise a field in the object  That would look like this   class DHT      def   init   self           self data              self data  one      1          self data  two      2          self data  three      3      def showData self           print self data   if   name         main         DHT   showData     Or even just   class DHT      def   init   self           self data     one    1    two    2    three    3       def showData self           print self data

[python] init() missing 1 required positional argument

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