diff -r 88a01948450d -r d33698326409 manipulating_strings/slides.org
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+#+LaTeX_CLASS: beamer
+#+LaTeX_CLASS_OPTIONS: [presentation]
+#+BEAMER_FRAME_LEVEL: 1
+
+#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
+#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)
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+
+#+LaTeX_CLASS: beamer
+#+LaTeX_CLASS_OPTIONS: [presentation]
+
+#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl}
+#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
+
+#+LaTeX_HEADER: \usepackage{listings}
+
+#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,
+#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
+#+LaTeX_HEADER:  showstringspaces=false, keywordstyle=\color{blue}\bfseries}
+
+#+TITLE:    Manipulating strings
+#+AUTHOR:    FOSSEE
+#+EMAIL:     
+#+DATE:    
+
+#+DESCRIPTION: 
+#+KEYWORDS: 
+#+LANGUAGE:  en
+#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
+#+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc
+
+* Outline
+  - Slicing strings to get sub-strings
+  - Reversing strings
+  - Replacing characters in strings. 
+  - Converting strings to upper or lower case
+  - Joining a list of strings
+* Question 1
+  Obtain the sub-string excluding the first and last characters from
+  the string ~s~.
+* Solution 1
+  #+begin_src python
+    In []:  s[1:-1]
+  #+end_src
+* Question 2
+  Given a list week, week = ~week = ["sun", "mon", "tue", "wed",
+  "thu", "fri", "sat"]~. Check if ~s~ is a valid name of a day of the
+  week. Change the solution to this problem, to include forms like,
+  SAT, SATURDAY, Saturday and Sat.
+* Solution 2
+  #+begin_src python
+    In []:  s in week
+    In []:  s.lower()[:3] in week
+  #+end_src
+* Question 3
+  Given ~email~ -- ~info@fossee[dot]in~
+
+  Replace the ~[dot]~ with ~.~ in ~email~
+* Solution 3
+  #+begin_src python
+    email.replace('[dot], '.')
+    print email
+  #+end_src
+* Question 4
+  From the ~email_str~ that we generated, change the separator to be a
+  semicolon instead of a comma.
+* Solution 4
+  #+begin_src python
+    email_str = email_str.replace(",", ";")
+  #+end_src
+* Summary
+  You should now be able to --
+  - Slice strings and get sub-strings out of them
+  - Reverse strings
+  - Replace characters in strings. 
+  - Convert strings to upper or lower case
+  - Join a list of strings
+
+* 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
+
+