34 - Learn to test simple functions for their functionality. |
34 - Learn to test simple functions for their functionality. |
35 - Learn how to automate tests. |
35 - Learn how to automate tests. |
36 - Need for coding style and some of the standards followed by the Python Community. |
36 - Need for coding style and some of the standards followed by the Python Community. |
37 - Handling Errors and Exceptions. |
37 - Handling Errors and Exceptions. |
38 |
38 |
39 |
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40 * gcd function |
39 * gcd function |
41 - Create gcd.py file with: |
40 - Create gcd.py file with: |
42 #+begin_LaTeX |
41 #+begin_src python |
43 \begin{lstlisting}[language=python] |
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44 def gcd(a, b): |
42 def gcd(a, b): |
45 if a % b == 0: |
43 if a % b == 0: |
46 return b |
44 return b |
47 return gcd(b, a%b) |
45 return gcd(b, a%b) |
48 \end{lstlisting} |
46 #+end_src python |
49 #+end_LaTeX |
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50 |
47 |
51 * Test for gcd.py |
48 * Test for gcd.py |
52 - Edit gcd.py file |
49 - Edit gcd.py file |
53 #+begin_LaTeX |
50 #+begin_src python |
54 \begin{lstlisting}[language=python] |
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55 |
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56 def gcd(a, b): |
51 def gcd(a, b): |
57 if b == 0: |
52 if b == 0: |
58 return a |
53 return a |
59 return gcd(b, a%b) |
54 return gcd(b, a%b) |
60 |
55 |
61 if __name__=='__main__': |
56 if __name__=='__main__': |
62 result = gcd(48, 64) |
57 result = gcd(48, 64) |
63 if result != 16: |
58 if result != 16: |
64 print "Test failed" |
59 print "Test failed" |
65 print "Test Passed" |
60 print "Test Passed" |
66 \end{lstlisting} |
61 |
67 #+end_LaTeX |
62 #+end_src |
68 |
63 |
69 * Automating tests |
64 * Automating tests |
70 #+begin_LaTeX |
65 #+begin_src python |
71 \begin{lstlisting}[language=python] |
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72 |
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73 if __name=__='__main__': |
66 if __name=__='__main__': |
74 for line in open('numbers.txt'): |
67 for line in open('numbers.txt'): |
75 numbers = line.split() |
68 numbers = line.split() |
76 x = int(numbers[0]) |
69 x = int(numbers[0]) |
77 y = int(numbers[1]) |
70 y = int(numbers[1]) |
78 result = int(numbers[2]) |
71 result = int(numbers[2]) |
79 if gcd(x, y) != result: |
72 if gcd(x, y) != result: |
80 print "Failed gcd test |
73 print "Failed gcd test |
81 for", x, y |
74 for", x, y |
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75 #+end_src |
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76 |
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77 * Question 1 |
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78 For the same inputs as gcd write automated tests for LCM. |
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79 * Solution 1 |
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80 #+begin_src python |
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81 def gcd(a, b): |
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82 if a % b == 0: |
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83 return b |
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84 return gcd(b, a%b) |
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85 |
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86 def lcm(a, b): |
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87 return (a * b) / gcd(a, b) |
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88 |
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89 if __name__ == '__main__': |
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90 for line in open('lcmtestcases.txt'): |
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91 numbers = line.split() |
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92 x = int(numbers[0]) |
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93 y = int(numbers[1]) |
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94 result = int(numbers[2]) |
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95 if lcm(x, y) != result: |
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96 print "Failed lcm test for", x, y |
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97 |
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98 #+end_src |
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99 |
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100 * Meaning full names |
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101 #+begin_src python |
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102 |
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103 amount = 12.68 |
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104 denom = 0.05 |
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105 nCoins = round(amount / denom) |
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106 rAmount = nCoins * denom |
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107 |
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108 #+end_src |
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109 |
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110 * Code style |
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111 - Four Space Indentation |
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112 - 79 character limit on a line |
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113 - Funtions should be seperated by |
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114 blank line |
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115 - Use Docstring |
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116 - White space around operators |
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117 - l = 32 % 4 |
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118 |
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119 * Question 2 |
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120 - Give meaningful names to the variables in following |
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121 code |
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122 |
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123 - c = a / b |
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124 |
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125 * Solution 2 |
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126 #+begin_src python |
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127 |
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128 quotient = dividend / divisor |
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129 |
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130 #+end_src |
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131 |
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132 * Code Snippet |
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133 #+begin_src python |
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134 |
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135 while True print 'Hello world' |
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136 |
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137 #+end_src |
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138 |
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139 * Error |
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140 #+begin_latex |
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141 \begin{lstlisting} |
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142 while True print 'Hello world' |
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143 \end{lstlisting} |
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144 \begin{lstlisting} |
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145 File "<stdin>", line 1, in ? |
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146 while True print 'Hello world' |
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147 SyntaxError: invalid syntax |
82 \end{lstlisting} |
148 \end{lstlisting} |
83 #+end_LaTeX |
149 #+end_latex |
84 |
150 |
85 |
151 * Code Snippet |
86 |
152 #+begin_src python |
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153 a = raw_input("Enter a number") |
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154 try: |
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155 num = int(a) |
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156 except: |
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157 print "Wrong input ..." |
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158 |
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159 #+end_src |
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160 |
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161 * Using idb |
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162 #+begin_latex |
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163 \small |
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164 \begin{lstlisting} |
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165 In []: import mymodule |
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166 In []: mymodule.test() |
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167 --------------------------------------------- |
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168 NameError Traceback (most recent call last) |
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169 <ipython console> in <module>() |
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170 mymodule.py in test() |
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171 1 def test(): |
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172 2 total=1+1 |
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173 ----> 3 print spam |
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174 NameError: global name 'spam' is not defined |
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175 |
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176 In []: %debug |
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177 > mymodule.py(2)test() |
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178 0 print spam |
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179 ipdb> total |
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180 2 |
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181 \end{lstlisting} |
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182 |
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183 #+end_latex |
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184 |
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185 |
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186 |
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187 * Summary |
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188 - Create simple tests for a function. |
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189 - Learn to Automate tests using many predefined test cases. |
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190 - Good coding standards. |
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191 - Difference between syntax error and exception. |
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192 - Handling exception using try and except. |
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193 - Using %debug for debugging on ipython. |
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194 |
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195 * Thank you! |
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196 #+begin_latex |
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197 \begin{block}{} |
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198 \begin{center} |
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199 This spoken tutorial has been produced by the |
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200 \textcolor{blue}{FOSSEE} team, which is funded by the |
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201 \end{center} |
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202 \begin{center} |
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203 \textcolor{blue}{National Mission on Education through \\ |
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204 Information \& Communication Technology \\ |
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205 MHRD, Govt. of India}. |
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206 \end{center} |
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207 \end{block} |
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208 #+end_latex |
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209 |