test

1.设计一个函数，统计一个字符串中出现频率最高的字符(单个符号)及其出现次数

#利用字典的key值唯一这个特点把字符串的每一个字符作为key,次数作为value
{字符:次数}

def get_count(str1):
  count_dict={}
  for i in str1:
    count = count_dict.get(i,0)
    count += 1
    count_dict [i] = count

max=0
char=''
for key in count_dict:
  value = count_dict[key]
if value > max:
max = value
char = key
return char,max

get_count('abcaabc')

第2题：
点(Point)类: 拥有属性x坐标和y坐标。拥有功能是计算两个点之间的距离。

线段(Line)类: 拥有属性起点和终点。功能有：1.获取线段的长度 2.判断指定的点是否在该线段上。

class   Point():
  def __init__(self,x=0,y=0):
    self.x=x
    self.y=y
  def distance(self,other):
    return ((self.x-other.x)**2+(self.y-other.y)**2)**0.5

class Line():
  def __init__(self,start_point,end_point):
    self.start_point=start_point
    self.end_point=end_point

def length_distance():
#线段的长度就是线段的起点到终点的距离
    return self.start_point.distance(self.end_point)

def is_on_line(self,point1):
  distance1 = self.start_point.distance(point1)
  distance2 = self.end_point.distance(point1)
  if distance1+distance2 == self.length():
      return True
return False