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author | Puneeth Chaganti | 2010-12-01 16:51:35 +0530 |
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committer | Puneeth Chaganti | 2010-12-01 16:51:35 +0530 |
commit | f3a34dfb4e879f3eb7274704f44546aac4add88f (patch) | |
tree | 1cb0a8cc5dbd5ee2b374350915ed2addfa0fb447 /getting-started-strings | |
parent | 347866ed0d29db61ee062563b1e1616cfb85588c (diff) | |
download | st-scripts-f3a34dfb4e879f3eb7274704f44546aac4add88f.tar.gz st-scripts-f3a34dfb4e879f3eb7274704f44546aac4add88f.tar.bz2 st-scripts-f3a34dfb4e879f3eb7274704f44546aac4add88f.zip |
Renamed all LOs to match with their names in progress.org.
Diffstat (limited to 'getting-started-strings')
-rw-r--r-- | getting-started-strings/quickref.tex | 8 | ||||
-rw-r--r-- | getting-started-strings/script.rst | 191 | ||||
-rw-r--r-- | getting-started-strings/slides.org | 80 | ||||
-rw-r--r-- | getting-started-strings/slides.tex | 129 |
4 files changed, 0 insertions, 408 deletions
diff --git a/getting-started-strings/quickref.tex b/getting-started-strings/quickref.tex deleted file mode 100644 index 3bd7055..0000000 --- a/getting-started-strings/quickref.tex +++ /dev/null @@ -1,8 +0,0 @@ -Creating a string:\\ -{\ex \lstinline| s = ``Hello World''|} -- Single quotes and triple -quotes can also be used. - -Accessing individual elements:\\ -{\ex \lstinline| s[5]|} -- Elements can be accessed with their index - -Strings are immutable. diff --git a/getting-started-strings/script.rst b/getting-started-strings/script.rst deleted file mode 100644 index 754fede..0000000 --- a/getting-started-strings/script.rst +++ /dev/null @@ -1,191 +0,0 @@ -.. Objectives -.. ---------- - -.. At the end of this tutorial, you should know -- - -.. 1. How to define strings -.. #. Different ways of defining a string -.. #. How to concatenate strings -.. #. How to print a string repeatedly -.. #. Accessing individual elements of the string -.. #. Immutability of strings - -.. Prerequisites -.. ------------- - -.. 1. getting started with ipython - -.. Author : Madhu - Internal Reviewer : Punch - External Reviewer : - Language Reviewer : Bhanukiran - Checklist OK? : <15-11-2010, Anand, OK> [2010-10-05] - -Script ------- - -{{{ Show the slide containing the title }}} - -Hello friends. Welcome to this spoken tutorial on Getting started with -strings. - -{{{ Show the slide containing the outline }}} - -In this tutorial, we will look at what we really mean by strings, how -Python supports the use of strings and some of the operations that can -be performed on strings. - -{{{ Shift to terminal and start ipython }}} - -To begin with let us start ipython, by typing:: - - ipython - -on the terminal - -So, what are strings? In Python anything within either single quotes -or double quotes or triple single quotes or triple double quotes are -strings. - -{{{ Type in ipython the following and read them as you type }}}:: - - 'This is a string' - "This is a string too' - '''This is a string as well''' - """This is also a string""" - 'p' - "" - -Note that it really doesn't matter how many characters are present in -the string. The last example is a null string or an empty string. - -Having more than one control character to define strings is handy when -one of the control characters itself is part of the string. For -example:: - - "Python's string manipulation functions are very useful" - -By having multiple control characters, we avoid the need for -escaping characters -- in this case the apostrophe. - -The triple quoted strings let us define multi-line strings without -using any escaping. Everything within the triple quotes is a single -string no matter how many lines it extends:: - - """Having more than one control character to define - strings come as very handy when one of the control - characters itself is part of the string.""" - -We can assign this string to any variable:: - - a = 'Hello, World!' - -Now 'a' is a string variable. String is a collection of characters. In -addition string is an immutable collection. So all the operations that -are applicable to any other immutable collection in Python works on -string as well. So we can add two strings:: - - a = 'Hello' - b = 'World' - c = a + ', ' + b + '!' - -We can add string variables as well as the strings themselves all in -the same statement. The addition operation performs the concatenation -of two strings. - -Similarly we can multiply a string with an integer:: - - a = 'Hello' - a * 5 - -gives another string in which the original string 'Hello' is repeated -5 times. - -Following is an exercise that you must do. - -%% %% Obtain the string ``%% -------------------- %%`` (20 hyphens) - without typing out all the twenty hyphens. - -Please, pause the video here. Do the exercise and then continue. - -:: - - s = "%% " + "-"*20 + " %%" - -Let's now look at accessing individual elements of strings. Since, -strings are collections we can access individual items in the string -using the subscripts:: - - a[0] - -gives us the first character in the string. The indexing starts from 0 -for the first character and goes up to n-1 for the last character. We -can access the strings from the end using negative indices:: - - a[-1] - -gives us the last element of the string and -:: - - a[-2] - -gives us second element from the end of the string - -Following is an exercise that you must do. - -%% %% Given a string, ``s = "Hello World"``, what is the output of:: - - s[-5] - s[-10] - s[-15] - -Please, pause the video here. Do the exercise and then continue. - -:: - - s[-5] - -gives us 'W' -:: - - s[-10] - -gives us 'e' and -:: - - s[-15] - -gives us an ``IndexError``, as should be expected, since the string -given to us is only 11 characters long. - -Let us attempt to change one of the characters in a string:: - - a = 'hello' - a[0] = 'H' - -As said earlier, strings are immutable. We cannot manipulate a -string. Although there are some methods which let us manipulate -strings, we will look at them in the advanced session on strings. In -addition to the methods that let us manipulate the strings we have -methods like split which lets us break the string on the specified -separator, the join method which lets us combine the list of strings -into a single string based on the specified separator. - -{{{ Show summary slide }}} - -This brings us to the end of another session. In this tutorial session -we learnt - - * How to define strings - * Different ways of defining a string - * String concatenation and repetition - * Accessing individual elements of the string - * Immutability of strings - -{{{ Show the "sponsored by FOSSEE" slide }}} - -This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India - -Hope you have enjoyed and found it useful. -Thank you! - diff --git a/getting-started-strings/slides.org b/getting-started-strings/slides.org deleted file mode 100644 index a1df437..0000000 --- a/getting-started-strings/slides.org +++ /dev/null @@ -1,80 +0,0 @@ -#+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) -#+PROPERTY: BEAMER_col_ALL 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 :ETC - -#+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: -#+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 -*** Defining strings -*** Concatenation -*** Accessing individual elements -*** Immutability of strings -* Question 1 - Obtain the string ~%% -------------------- %%~ (20 hyphens) without - typing out all the twenty hyphens. -* Solution 1 - #+begin_src python - s = "%% " + "-"*20 + " %%" - #+end_src -* Question 2 - Given a string, ~s~ which is ~Hello World~ , what is the output of:: - #+begin_src python - s[-5] - s[-10] - s[-15] - #+end_src -* Solution 2 - #+begin_src python - 'W' - 'e' - IndexError - #+end_src -* Summary - In this tutorial we have learnt - + How to define strings - + Different ways of defining a string - + String concatenation and repetition - + Accessing individual elements of the string - + Immutability 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 - - diff --git a/getting-started-strings/slides.tex b/getting-started-strings/slides.tex deleted file mode 100644 index ed0dedb..0000000 --- a/getting-started-strings/slides.tex +++ /dev/null @@ -1,129 +0,0 @@ -% Created 2010-11-10 Wed 10:46 -\documentclass[presentation]{beamer} -\usepackage[latin1]{inputenc} -\usepackage[T1]{fontenc} -\usepackage{fixltx2e} -\usepackage{graphicx} -\usepackage{longtable} -\usepackage{float} -\usepackage{wrapfig} -\usepackage{soul} -\usepackage{textcomp} -\usepackage{marvosym} -\usepackage{wasysym} -\usepackage{latexsym} -\usepackage{amssymb} -\usepackage{hyperref} -\tolerance=1000 -\usepackage[english]{babel} \usepackage{ae,aecompl} -\usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet} -\usepackage{listings} -\lstset{language=Python, basicstyle=\ttfamily\bfseries, -commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen}, -showstringspaces=false, keywordstyle=\color{blue}\bfseries} -\providecommand{\alert}[1]{\textbf{#1}} - -\title{} -\author{FOSSEE} -\date{} - -\usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent} -\begin{document} - - - - - - - - - - - -\begin{frame} -\frametitle{Outline} -\label{sec-1} -\begin{itemize} - -\item Defining strings\\ -\label{sec-1_1}% -\item Concatenation\\ -\label{sec-1_2}% -\item Accessing individual elements\\ -\label{sec-1_3}% -\item Immutability of strings\\ -\label{sec-1_4}% -\end{itemize} % ends low level -\end{frame} -\begin{frame} -\frametitle{Question 1} -\label{sec-2} - - Obtain the string \texttt{\%\% -------------------- \%\%} (20 hyphens) without - typing out all the twenty hyphens. -\end{frame} -\begin{frame}[fragile] -\frametitle{Solution 1} -\label{sec-3} - -\lstset{language=Python} -\begin{lstlisting} -s = "%% " + "-"*20 + " %%" -\end{lstlisting} -\end{frame} -\begin{frame}[fragile] -\frametitle{Question 2} -\label{sec-4} - - Given a string, \texttt{s} which is \texttt{Hello World} , what is the output of:: -\lstset{language=Python} -\begin{lstlisting} -s[-5] -s[-10] -s[-15] -\end{lstlisting} -\end{frame} -\begin{frame}[fragile] -\frametitle{Solution 2} -\label{sec-5} - -\lstset{language=Python} -\begin{lstlisting} -'W' -'e' -IndexError -\end{lstlisting} -\end{frame} -\begin{frame} -\frametitle{Summary} -\label{sec-6} - - In this tutorial we have learnt -\begin{itemize} -\item How to define strings -\item Different ways of defining a string -\item String concatenation and repetition -\item Accessing individual elements of the string -\item Immutability of strings -\end{itemize} - - -\end{frame} -\begin{frame} -\frametitle{Thank you!} -\label{sec-7} - - \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{frame} - -\end{document} |