Python Development (session 10)

Fossee

Description

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 / ...

Sujets

• Python
• Tutoriel
• Calcul (mathématiques)

Informations

• Publié par: mtoledan
• Publié le: 27 juin 2011
• Nombre de lectures: 156
• Langue: English

Extrait

FOSSEE(IIToBbmya)

Python Development

FOSSEE

Department of Aerospace Engineering IIT Bombay

1 May, 2010 Day 2, Session 4

PythonDevelopment1/63

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Debugging Errors and Exceptions Strategy Exercise

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1

Tests: Getting started

2

Coding Style

3

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printgcd(15, 65) printgcd(16, 76)

python gcd.py

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python lcm.py

gcd(a,

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python gcd.py python lcm.py

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defgcd(a, b): ifa % b == 0: returnb returngcd(b, a%b)

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nose: http: //code.google.com/p/python-nose/

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2

Coding Style

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Debugging Errors and Exceptions Strategy Exercise

Outline

1

Tests: Getting started

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Readability Counts! Code is read more often than its written. Consistency! Know when to be inconsistent. Play telephone with that line of code.

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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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