python--Object-oriented

First, process-oriented, in accordance with the problem-solving steps, step by step, the idea is relatively simple, but difficult to maintain, object-oriented programming is to divide the problem, each module to build the final total solution

1. Object-oriented programming for shot putting problem

1  fromMathImportsin, cos, radians2  #Create Class3 classProjectile:4     def __init__(self, angle, velocity, height):5         6         #Create a state to create a projectile object based on the given emission angle, initial velocity, and position7Self.xpos = 0.08Self.ypos =Height9theta =radians (angle)TenSelf.xvel = Velocity *cos (theta) OneSelf.yvel = Velocity *sin (theta) A  -     #methods for creating classes -     defUpdate (self, time): the         #update the state of the projectile -Self.xpos = Self.xpos + Time *Self.xvel -Yvell = self.yvel-9.8 * Time -Self.ypos = Self.ypos + Time * (Self.yvel + Yvell)/2.0 +Self.yvel =Yvell -   +     defGetY (self): A         #returns the angle of the projectile body at         returnSelf.ypos -   -     defGetX (self): -         #returns the distance of the projectile body -         returnSelf.xpos

Call class

1  fromProjectileImport*2  3 defgetinputs ():4A = eval (input ("Enter the launch angle (in degrees):"))5v = eval (input ("Enter the initial velocity (in meters/sec):"))6H = eval (input ("Enter The initial height (in meters):"))7t = eval (input ("Enter The time interval:"))8     returna,v,h,t9  Ten defMain (): OneAngle,vel,h0,time = Getinputs ()#Input Parameters AShot = Projectile (angle,vel,h0)#Call class, note that only three parameters are used -      whileShot.gety () >=0: - shot.update (Time) the     Print("\ndistance traveled:{0:0.1f}meters.". Format (Shot.getx ())) -     - if __name__=="__main__": -Main ()

2. GPA

1 #find the highest GPA students2 3  #Defining Classes4 classStudent:5     def __init__(self, name, hours, qpoints):6Self.name =name7Self.hours =float (hours)8Self.qpoints =float (qpoints)9         Ten     #Defining Methods One     defGetName (self): A         returnSelf.name -       -     defgetHours (self): the         returnself.hours -       -     defgetqpoints (self): -         returnself.qpoints +       -     defGPA (self): +         returnself.qpoints/self.hours A  at #define functions to get each row of data - defmakestudent (INFOSTR): -Name, hours, qpoints = Infostr.split ("\ t") -     returnStudent (name, hours, qpoints) -       - defMain (): in     #Open Input File -filename = input ("Enter Name the grade file:") toinfile = open (filename,'R') +     #the first student's record in the settings file is best -Best =makestudent (Infile.readline ()) the   *     #working with remaining line data in a file $      forLineinchinfile:Panax Notoginseng         #convert each row of data to a single record -s =makestudent (line) the         #If the student is currently the highest GPA, then record it down +         ifS.gpa () >Best.gpa (): ABest =s the infile.close () +   -     #print the highest GPA student information $     Print("The best student is:", Best.getname ()) $     Print("Hours:", Best.gethours ()) -     Print("GPA:", Best.gpa ()) -   the if __name__=='__main__': -Main ()

python--Object-oriented