1 / 5

Avoiding Rewriting Code:

Avoiding Rewriting Code:. We can use functions as input parameters We can use inheritance. Functions as input parameters:. from cisc106 import * def speak( f,n ): """ f is a function being passed as an input parameter. """ return f(n) def cat(n): str1 = ""

edmund
Download Presentation

Avoiding Rewriting Code:

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Avoiding Rewriting Code: We can use functions as input parameters We can use inheritance

  2. Functions as input parameters: from cisc106 import * def speak(f,n): """ f is a function being passed as an input parameter. """ return f(n) def cat(n): str1 = "" for x in range(n): str1 += "meow " return (str1) def dog(n): str1 = "" for x in range(n): str1 += "woof " return (str1) def seal(n): str1 = "" for x in range(n): str1 += "bark " return (str1) assertEqual(speak(cat,3), "meow meowmeow ") assertEqual(speak(dog, 5), "woof woofwoofwoofwoof ") assertEqual(speak(seal,4), "bark barkbarkbark ")

  3. Functions as input parameters: This is a function that takes as input parameters a function (f) and a number (n) and computes the sum of the series as follows: def series(f, n): """ Computes the sum of the series defined by function f for the first 1 through n terms   Input: f -- function n -- number returns – the sum of the series (a number) """ t=0 for i in range(n): t += f(i+1) return t def harmonic(n): return 1.0 / n def geometric_onehalf(n): return (1.0 / 2.0) ** (n-1) def alternating_harmonic(n): return (2 * (n % 2) - 1) * harmonic(n) assertEqual(series(harmonic, 1), 1.0) assertEqual(series(harmonic, 10), 2.9289) assertEqual(series(geometric_onehalf, 2), 1.5) assertEqual(series(geometric_onehalf, 100), 2) assertEqual(series(alternating_harmonic, 2), .5)

  4. Inheritance class Cat(Pet): def __init__(self,sound,weight,name): Pet.__init__(self,name,"cat",weight) self.sound = sound def makesound(self): print(self.sound) ########################################## x = Pet("Fluffy","echidna",20) y = Dog("woof",45,"Lassie","puggle") z = Cat("meow",15,"Sweetie Pie") print(x) print(y) print(z) x.addweight(10) y.addweight(50) print(str(x.weight)) print(str(y.weight)) x.makesound() y.makesound() z.makesound() class Pet(object): def __init__(self,name,species,weight): self.name = name self.species = species self.weight = weight def addweight(self, value): self.weight += value def __str__(self): mystr="My name is “+self.name+" and I am a "+self.species return(mystr) def makesound(self): print("I make animal sounds.") class Dog(Pet): def __init__(self,sound,weight,name,breed): Pet.__init__(self,name,"dog",weight) self.sound = sound self.breed = breed def __str__(self): mystr="My name is "+self.name+" and I am a "+self.breed return(mystr) def makesound(self): str1 = self.sound + " " + self.sound print(str1)

More Related