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      Positional Arguments

      Python Tutorial

      This Python tutorial has been written for the beginners to help them understand the basic to advanced concepts of Python Programming Language. After completing this tutorial, you will find yourself at a great level of expertise in Python, from where you can take yourself to the next levels to become a world class Software Engineer.

      Positional Arguments

      The list of variables declared in the parentheses at the time of defining a function are the formal arguments. A function may be defined with any number of formal arguments.
      While calling a function
      • All the arguments are required
      • The number of actual arguments must be equal to the number of formal arguments.
      • Formal arguments are positional. They Pick up values in the order of definition.
      • The type of arguments must match.
      • Names of formal and actual arguments need not be same.

      Example

      def add(x,y):
         z=x+y
         print ("x={} y={} x+y={}".format(x,y,z))
      
      a=10
      b=20
      add(a,b)
      It will produce the following output
      x=10 y=20 x+y=30
      Here, the add() function has two formal arguments, both are numeric. When integers 10 and 20 passed to it. The variable a takes 10 and b takes 20, in the order of declaration. The add() function displays the addition.
      Python also raises error when the number of arguments don't match. Give only one argument and check the result.
      add(b)
      TypeError: add() missing 1 required positional argument: 'y'
      Pass more than number of formal arguments and check the result −
      add(10, 20, 30)
      TypeError: add() takes 2 positional arguments but 3 were given
      Data type of corresponding actual and formal arguments must match. Change a to a string value and see the result.
      a="Hello"
      b=20
      add(a,b)
      It will produce the following output
      z=x+y
           ~^~
      TypeError: can only concatenate str (not "int") to str

      Practice with Online Editor

      Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
      Remember to save code(Ctrl + S Or Command + S) before run it.