author | Anoop Jacob Thomas<anoop@fossee.in> |
Wed, 10 Nov 2010 18:58:11 +0530 | |
changeset 445 | 0c8ab2b5225b |
child 446 | 2ce824b5adf4 |
permissions | -rw-r--r-- |
445
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#+LaTeX_CLASS: beamer |
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#+LaTeX_CLASS_OPTIONS: [presentation] |
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#+BEAMER_FRAME_LEVEL: 1 |
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#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent} |
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#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra) |
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#+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 |
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#+LaTeX_CLASS: beamer |
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#+LaTeX_CLASS_OPTIONS: [presentation] |
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#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl} |
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#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet} |
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#+LaTeX_HEADER: \usepackage{listings} |
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#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries, |
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#+LaTeX_HEADER: commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen}, |
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#+LaTeX_HEADER: showstringspaces=false, keywordstyle=\color{blue}\bfseries} |
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#+TITLE: Getting started with functions |
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#+AUTHOR: FOSSEE |
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#+EMAIL: info@fossee.in |
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#+DATE: |
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#+DESCRIPTION: |
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#+KEYWORDS: |
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#+LANGUAGE: en |
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#+OPTIONS: H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t |
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#+OPTIONS: TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc |
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# * Outline |
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33 |
# - Manipulating one and multi dimensional arrays |
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34 |
# - Access and change individual elements |
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35 |
# - Access and change rows and columns |
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36 |
# - Slicing and striding on arrays to access chunks |
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37 |
# - Read images into arrays and manipulations |
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38 |
# * Sample Arrays |
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39 |
# #+begin_src python |
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# In []: A = array([12, 23, 34, 45, 56]) |
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41 |
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# In []: C = array([[11, 12, 13, 14, 15], |
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43 |
# [21, 22, 23, 24, 25], |
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# [31, 32, 33, 34, 35], |
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45 |
# [41, 42, 43, 44, 45], |
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# [51, 52, 53, 54, 55]]) |
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# #+end_src |
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49 |
# * Question 1 |
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50 |
# Change the last column of ~C~ to zeroes. |
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51 |
# * Solution 1 |
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52 |
# #+begin_src python |
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# In []: C[:, -1] = 0 |
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# #+end_src |
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# * Question 2 |
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# Change ~A~ to ~[11, 12, 13, 14, 15]~. |
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# * Solution 2 |
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58 |
# #+begin_src python |
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# In []: A[:] = [11, 12, 13, 14, 15] |
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# #+end_src |
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# * squares.png |
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# #+begin_latex |
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# \begin{center} |
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# \includegraphics[scale=0.6]{squares} |
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# \end{center} |
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# #+end_latex |
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# * Question 3 |
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# - obtain ~[22, 23]~ from ~C~. |
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# - obtain ~[11, 21, 31, 41]~ from ~C~. |
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# - obtain ~[21, 31, 41, 0]~. |
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# * Solution 3 |
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72 |
# #+begin_src python |
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# In []: C[1, 1:3] |
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# In []: C[0:4, 0] |
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# In []: C[1:5, 0] |
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# #+end_src |
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# * Question 4 |
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# Obtain ~[[23, 24], [33, -34]]~ from ~C~ |
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# * Solution 4 |
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80 |
# #+begin_src python |
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# In []: C[1:3, 2:4] |
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# #+end_src |
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# * Question 5 |
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# Obtain the square in the center of the image |
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85 |
# * Solution 5 |
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86 |
# #+begin_src python |
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# In []: imshow(I[75:225, 75:225]) |
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# #+end_src |
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# * Question 6 |
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# Obtain the following |
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91 |
# #+begin_src python |
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# [[12, 0], [42, 0]] |
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# [[12, 13, 14], [0, 0, 0]] |
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# #+end_src |
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|
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# * Solution 6 |
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97 |
# #+begin_src python |
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# In []: C[::3, 1::3] |
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# In []: C[::4, 1:4] |
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# #+end_src |
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# * Summary |
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102 |
# You should now be able to -- |
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103 |
# - Manipulate 1D \& Multi dimensional arrays |
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104 |
# - Access and change individual elements |
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# - Access and change rows and columns |
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# - Slice and stride on arrays |
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107 |
# - Read images into arrays and manipulate them. |
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108 |
|
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109 |
|
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* Outline |
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111 |
- Define functions |
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- Pass arguments to functions |
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- Learn about docstrings |
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- Return values from functions |
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|
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* Function |
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117 |
- Eliminate code redundancy |
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118 |
- Help in code reuse |
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119 |
- Subroutine |
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120 |
- relatively independent of remaining code |
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121 |
|
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122 |
* ~f(x)~ a mathematical function |
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123 |
|
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124 |
$f(x) = x^{2}$ |
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125 |
|
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126 |
: f(1) -> 1 |
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127 |
: f(2) -> 4 |
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128 |
|
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129 |
* Define ~f(x)~ in Python |
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130 |
#+begin_src python |
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131 |
def f(x): |
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132 |
return x*x |
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133 |
#+end_src |
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134 |
|
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135 |
- ~def~ - keyword |
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136 |
- ~f~ - function name |
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137 |
- ~x~ - parameter / argument to function ~f~ |
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138 |
|
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139 |
* Exercise 1 |
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140 |
|
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141 |
Write a python function named ~cube~ which computes the cube of a given |
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142 |
number ~n~. |
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143 |
|
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144 |
- Pause here and try to solve the problem yourself. |
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145 |
|
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146 |
* Solution |
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147 |
#+begin_src python |
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148 |
def cube(n): |
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149 |
return n**3 |
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150 |
#+end_src |
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151 |
|
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152 |
* ~greet~ function |
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153 |
|
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154 |
Function ~greet~ which will print ~Hello World!~. |
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155 |
#+begin_src python |
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156 |
def greet(): |
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157 |
print "Hello World!" |
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158 |
#+end_src |
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159 |
- Call the function ~greet~ |
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160 |
: In []: greet() |
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161 |
: Hello World! |
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162 |
|
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163 |
* Exercise 2 |
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164 |
|
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165 |
Write a python function named ~avg~ which computes the average of |
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166 |
~a~ and ~b~. |
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167 |
|
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168 |
- Pause here and try to solve the problem yourself. |
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169 |
|
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170 |
* Solution 2 |
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171 |
#+begin_src python |
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172 |
def avg(a,b): |
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173 |
return (a + b)/2 |
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174 |
#+end_src |
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175 |
|
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176 |
- ~a~ and ~b~ are parameters |
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177 |
- ~def f(p1, p2, p3, ... , pn)~ |
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178 |
|
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179 |
* Docstring |
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180 |
|
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181 |
- Documenting/commenting code is a good practice |
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182 |
#+begin_src python |
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183 |
def avg(a,b): |
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184 |
""" avg takes two numbers as input |
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185 |
(a & b), and returns the average |
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186 |
of a and b""" |
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187 |
return (a+b)/2 |
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188 |
#+end_src |
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|
189 |
- Docstring |
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190 |
- written in the line after the ~def~ line. |
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191 |
- Inside triple quote. |
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192 |
- Documentation |
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193 |
: avg? |
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|
194 |
* Exercise 3 |
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|
195 |
Add docstring to the function f. |
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196 |
|
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|
197 |
* Solution 3 |
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|
198 |
|
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|
199 |
#+begin_src python |
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|
200 |
def f(x): |
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|
201 |
"""Accepts a number x as argument and, |
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202 |
returns the square of the number x.""" |
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|
203 |
return x*x |
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|
204 |
#+end_src |
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|
205 |
|
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|
206 |
* Exercise 4 |
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|
207 |
Write a python function named ~circle~ which returns the area and |
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208 |
perimeter of a circle given radius ~r~. |
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|
209 |
|
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|
210 |
* Solution 4 |
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|
211 |
#+begin_src python |
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|
212 |
def circle(r): |
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|
213 |
"""returns area and perimeter of a circle given |
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|
214 |
radius r""" |
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|
215 |
pi = 3.14 |
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|
216 |
area = pi * r * r |
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217 |
perimeter = 2 * pi * r |
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218 |
return area, perimeter |
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|
219 |
#+end_src |
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220 |
|
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|
221 |
* ~what~ |
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222 |
#+begin_src python |
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223 |
|
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224 |
def what( n ): |
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|
225 |
if n < 0: n = -n |
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226 |
while n > 0: |
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227 |
if n % 2 == 1: |
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228 |
return False |
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229 |
n /= 10 |
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|
230 |
return True |
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|
231 |
#+end_src |
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232 |
|
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|
233 |
* ~even_digits~ |
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234 |
#+begin_src python |
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|
235 |
def even_digits( n ): |
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|
236 |
"""returns True if all the digits of number |
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|
237 |
n is even returns False if all the digits |
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|
238 |
of number n is not even""" |
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|
239 |
if n < 0: n = -n |
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|
240 |
while n > 0: |
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|
241 |
if n % 2 == 1: |
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|
242 |
return False |
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|
243 |
n /= 10 |
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|
244 |
return True |
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|
245 |
#+end_src |
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|
246 |
|
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|
247 |
* ~what~ |
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|
248 |
#+begin_src python |
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|
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def what( n ): |
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i = 1 |
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while i * i < n: |
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i += 1 |
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return i * i == n, i |
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#+end_src |
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|
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* ~is_perfect_square~ |
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#+begin_src python |
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def is_perfect_square( n ): |
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"""returns True and square root of n, |
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if n is a perfect square, otherwise |
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returns False and the square root |
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of the next perfect square""" |
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i = 1 |
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while i * i < n: |
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i += 1 |
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return i * i == n, i |
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#+end_src |
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|
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* Summary |
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- Functions in Python |
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- Passing parameters to a function |
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- Returning values from a function |
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|
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- We also did few code reading exercises. |
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|
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* Thank you! |
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#+begin_latex |
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\begin{block}{} |
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\begin{center} |
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This spoken tutorial has been produced by the |
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\textcolor{blue}{FOSSEE} team, which is funded by the |
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\end{center} |
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\begin{center} |
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\textcolor{blue}{National Mission on Education through \\ |
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Information \& Communication Technology \\ |
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MHRD, Govt. of India}. |
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\end{center} |
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\end{block} |
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#+end_latex |