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1.计算GPA,返回最高GPA同学
# 找到GPA最高的学生
class Student:
def __init__(self, name, hours, qpoints):
self.name = name
self.hours = float(hours)
self.qpoints = float(qpoints)
def getName(self):
return self.name
def getHours(self):
return self.hours
def getQPoints(self):
return self.qpoints
def gpa(self):
return self.qpoints/self.hours
def makeStudent(infoStr):
name, hours, qpoints = infoStr.split("\t")
return Student(name, hours, qpoints)
def main():
# 打开输入文件
filename = input("Enter name the grade file: ")
infile = open(filename, 'r')
# 设置文件中第一个学生的记录为best
best = makeStudent(infile.readline())
# 处理文件剩余行数据
for line in infile:
# 将每一行数据转换为一个记录
s = makeStudent(line)
# 如果该学生是目前GPA最高的,则记录下来
if s.gpa() > best.gpa():
best = s
infile.close()
# 打印GPA成绩最高的学生信息
print("The best student is:", best.getName())
print("hours:", best.getHours())
print("GPA:", best.gpa())
if __name__ == '__main__':
main()
2.铅球位置更新
from math import sin, cos, radians
class Projectile:
def __init__(self, angle, velocity, height):
#根据给定的发射角度、初始速度和位置创建一个投射体对象
self.xpos = 0.0
self.ypos = height
theta = radians(angle)
self.xvel = velocity * cos(theta)
self.yvel = velocity * sin(theta)
def update(self, time):
#更新投射体的状态
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
def getY(self):
#返回投射体的角度
return self.ypos
def getX(self):
#返回投射体的距离
return self.xpos
3.面向对象程序设计的特点:封装、多态和继承;支持代码复用。