advanced-features-functions/slides.org
author anand
Mon, 08 Nov 2010 01:36:47 +0530
changeset 455 f5b7d0b693d9
parent 272 08638b1e211e
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#+TITLE:    Advanced features of functions
#+AUTHOR:    FOSSEE
#+EMAIL:     
#+DATE:    

#+DESCRIPTION: 
#+KEYWORDS: 
#+LANGUAGE:  en
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* Outline
  - Assigning default values to arguments
  - Calling functions using Keyword arguments
  - functions in standard library 
* Question 1
  Redefine the function ~welcome~, by interchanging it's
  arguments. Place the ~name~ argument with it's default value of
  "World" before the ~greet~ argument.
* Solution 1
  #+begin_src python
    def welcome(name="World", greet):
        print greet, name
  #+end_src
  We get an error that reads ~SyntaxError: non-default argument
  follows default argument~. When defining a function all the
  argument with default values should come at the end.

* Question 2
  See the definition of linspace using ~?~ and observe how all the
  arguments with default values are towards the end.
* Solution 2
  #+begin_src python
    linspace?
  #+end_src
* Question 3
  Redefine the function ~welcome~ with a default value of
  "Hello" to the ~greet~ argument. Then, call the function without any
  arguments. 
* Solution 3
  #+begin_src python
    def welcome(greet="Hello", name="World"):
        print greet, name
     
    welcome()
  #+end_src
* Summary
  You should now be able to --
  + define functions with default arguments
  + call functions using keyword arguments
* Thank you!
#+begin_latex
  \begin{block}{}
  \begin{center}
  This spoken tutorial has been produced by the
  \textcolor{blue}{FOSSEE} team, which is funded by the 
  \end{center}
  \begin{center}
    \textcolor{blue}{National Mission on Education through \\
      Information \& Communication Technology \\ 
      MHRD, Govt. of India}.
  \end{center}  
  \end{block}
#+end_latex