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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)
#+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: Getting started with for
#+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
- ~for~ loop in Python.
- Blocks of code in Python.
- Indentation
* Whitespace in Python
- Whitespace is significant
- blocks are visually separated
- Blocks are indented using 4 spaces
: Block A
: Block A
: Block B
: Block B
: Block A
~Block B~ is an inner block and is indented using 4 spaces
* Exercise 1
Write a ~for~ loop which iterates through a list of numbers and find
the square root of each number.
:
The numbers are,
: 1369, 7225, 3364, 7056, 5625, 729, 7056,
: 576, 2916
* Solution 1
- Open text editor and type the following code
#+begin_src python
numbers = [1369, 7225, 3364, 7056, 5625, 729, 7056,
576, 2916]
for each in numbers:
print "Square root of", each, "is", sqrt(each)
print "This is not in for loop!"
#+end_src
* Save \& run script
- Save the script as ~list_roots.py~
- Run in ~ipython~ interpreter as,
: In []: %run -i list_roots.py
* Exercise 2
From the given numbers make a list of perfect squares and a list of those which are not.
:
The numbers are,
: 7225, 3268, 3364, 2966, 7056, 5625, 729, 5547,
: 7056, 576, 2916
* Exercise 3 (indentation in ~ipython~)
Print the square root of numbers in the list.
:
Numbers are,
: 7225, 3268, 3364, 2966, 7056, 5625, 729, 5547,
: 7056, 576, 2916
* Indentation in ~ipython~
: In []: numbers = [1369, 7225, 3364, 7056, 5625,
: ...: 729, 7056, 576, 2916]
: In []: for each in numbers:
: ...:
Note the four spaces here
:
:
:
:
:
:
* Indentation in ~ipython~ (cont'd)
: In []: numbers = [1369, 7225, 3364, 7056, 5625,
: ...: 729, 7056, 576, 2916]
: In []: for each in numbers:
: ...:
Note the four spaces here
:
Now type the rest of the code
: ...: print "Square root of", each,
: ...: print "is", sqrt(each)
: ...:
: ...:
* Indentation in ~python~ interpreter
Find out the cube of all the numbers from 1 to 10.
:
/do it in the python interpreter/
* Indentation in ~python~ interpreter (cont'd)
#+begin_src python
>>> for i in range(1, 11):
... print i, "cube is", i**3
...
#+end_src
* ~range()~ function
- in built function in Python
- generates a list of integers
- /syntax:/ range([start,] stop[, step])
- /example:/
- range(1, 20) - /generates integers from 1 to 20/
- range(20) - /generates integers from 0 to 20/
* Exercise 4
Print all the odd numbers from 1 to 50.
* Summary
- blocks in ~python~
- indentation
- blocks in ~ipython~ interpreter
- ~for~ loop
- iterating over list using ~for~ loop
- ~range()~ function
* 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
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