Python Development (session 10)
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2011
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40
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English
Documents
2011
Le téléchargement nécessite un accès à la bibliothèque YouScribe Tout savoir sur nos offres
Python DevelopmentFOSSEEDepartment of Aerospace EngineeringIIT Bombay1 May, 2010Day 2, Session 4FOSSEE (IIT Bombay) Python Development 1 / 36Tests: Getting startedOutline1 Tests: Getting started2 Coding Style3 DebuggingErrors and ExceptionsStrategyExerciseFOSSEE (IIT Bombay) Python Development 2 / 36Tests: Getting startedgcd revisited!Opengcd.pydef gcd(a, b):if a % b == 0:return breturn gcd(b, a%b)print gcd(15, 65) gcd(16, 76)python gcd.pyFOSSEE (IIT Bombay) Python Development 3 / 36Tests: Getting startedFind lcm using our gcd moduleOpenlcm.pyablcm =gcd(a,b)from gcd import gcddef lcm(a, b):return (a b) / gcd(a, b)*print lcm(14, 56)python lcm.py5456FOSSEE (IIT Bombay) Python Development 4 / 36Tests: Getting startedWriting stand-alone moduleEditgcd.py file to:def gcd(a, b):if a % b == 0:return breturn gcd(b, a%b)if __name__ == "__main__":print gcd(15, 65) gcd(16, 76)python gcd.py lcm.pyFOSSEE (IIT Bombay) Python Development 5 / 36Tests: Getting startedAutomating testsdef gcd(a, b):if a % b == 0:return breturn gcd(b, a % b)if __name__ == ’__main__’:assert gcd(15, 65) == 5 gcd(16, 76) == 4FOSSEE (IIT Bombay) Python Development 6 / 36Tests: Getting startedAutomating testsif __name__ == ’__main__’:for line in open(’numbers.txt’):numbers = line.split()x = int(numbers[0])y = int(numbers[1])result = int(numbers[2])if gcd(x, y) != result:print "Failed gcd testfor", x, yFOSSEE (IIT Bombay) Python Development 7 / ...
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Python Development
FOSSEE
Department of Aerospace Engineering IIT Bombay
1 May, 2010 Day 2, Session 4
PythonDevelopment1/63
Debugging Errors and Exceptions Strategy Exercise
opment2/36
1
Tests: Getting started
2
Coding Style
3
TestsratsOdetteG:gnitliutne
Opendcpy.g
printgcd(15, 65) printgcd(16, 76)
python gcd.py
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defgcd(a, b): ifa % b == 0: returnb return,gdcb(
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fromgcdrotipmgcd deflcm(a, b): return(a * b)
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printlcm(14, 56)
python lcm.py
gcd(a,
b)
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python gcd.py python lcm.py
__ ____ __ name ==" main ": printgcd(15, 65) printgcd(16, 76)
if
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defgcd(a, b): ifa % b == 0: returnb returngcd(b, a%b)
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b)
def
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name ==’ main ’: __ ____ __ assert gcd(15, 65) == 5 assert gcd(16, 76) == 4
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__ ____ __ name ==’ main ’: forlineinopen(ermbnu’’t.sxt): numbers = line.split() x = int(numbers[0]) y = int(numbers[1]) result = int(numbers[2]) ifgcd(x, y) != result: print"Failed gcd test for", x,
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Python’situntset: http://docs.python.org/library/ unittest.html
nose: http: //code.google.com/p/python-nose/
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2
Coding Style
3
Debugging Errors and Exceptions Strategy Exercise
Outline
1
Tests: Getting started
Readability Counts! Code is read more often than its written. Consistency! Know when to be inconsistent. Play telephone with that line of code.
Style Rule #1 Naming is 80% of programming
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amount = 12.68 denom = 0.05 _ (amount/ ) num coins = round denom _ _ rounded amount = num coins * denom
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