class ShortInputError(Exception):
def __init__(self):
pass
def __str__(self):
return f'向量的长度不对'
class Vector:
# 构造方法，初始化，定义向量，需要把参数的各元素转化为浮点数
def __init__(self, data):
self.__data=data
if isinstance(self.__data,tuple) or isinstance(self.__data,list):
pass
else:
print('输出格式有误')
def get(self):
return self.__data,len(self.__data)
# 与两一个向量相加，对应分量相加，返回新向量
def __add__(self, anotherPoint):
try:
if len(self.__data)!=anotherPoint.get()[1]:
raise ShortInputError()
except Exception as result:
print(result)
else:
print('是两个合法的向量')
finally:
ret = [self.get()[0][i]+anotherPoint.get()[0][i] for i in range(anotherPoint.get()[1])]
return ret
# 减去另一个向量，对应分量相减，返回新向量
def __sub__(self, anotherPoint):
try:
if len(self.__data)!=anotherPoint.get()[1]:
raise ShortInputError()
except Exception as result:
print(result)
else:
print('是两个合法的向量')
finally:
ret = [self.get()[0][i]-anotherPoint.get()[0][i] for i in range(anotherPoint.get()[1])]
return ret
# 向量与一个数字相乘，各分量乘以同一个数字，返回新向量
def __mul__(self, n):
ret=[i*n for i in self.__data]
return ret
# 向量除以一个数字，各分量除以同一个数字，返回新向量
def __truediv__(self, n):
if n==0:
print('错误')
return
else:
ret = [i / n for i in self.__data]
return ret
def __getitem__(self, index):
if index>len(self.__data)-1 or index<-len(self.__data):
print('错误')
return
else:
return self.__data[index]
def __setitem__(self, index, v):
if index>len(self.__data)-1 or index<-len(self.__data):
print('错误')
return
else:
self.__data[index]=v
return self.__data
# 查看向量长度，所有分量平方和的平方根
@property
def length(self):
ret = [i **2 for i in self.__data]
return sum(ret)**0.5
def __str__(self):
return ('这是一个实例化对象')
li=[1,2,3]
li1=[4,5,6]
li2=[3,4,5]
a=Vector(li)
b=Vector(li1)
c=Vector(li2)
ret=a.__getitem__(1)
print(ret)
ret=a.__add__(b)
print(ret)
ret=a.__sub__(b)
print(ret)
ret=a.__truediv__(0)
print(ret)
ret=a.__truediv__(0.5)
print(ret)
ret=a.__setitem__(1,4)
print(ret)
ret=c.length
print(ret)
print(c)
