Python list of two-dimensional problems-CodePudding

Established a two-dimensional list, put a custom list of class, but after the operation to append an instance of two-dimensional list all instances of the changed, learned c + +, before feeling is become a reference assignment, python just learning, could you tell me how to eliminate the associated list in each instance, the following code

The class Grid:

Pointx=[]
Pointy=[]
Pointz=[]
PointNum=0
MinZ=100
MinZRange=0

Def __init__ (self, pNum) :
PointNum=pNum
MinZ=100
MinZRange=0

Def AddPoint (self, pointX, pointY, pointZ) :
Self. Pointx. Append (pointx)
The self. The pointy. Append (pointy)
Self. Pointz. Append (pointz)
The self. The pointNum +=1

Def findMinZ (self) :
Size=self. PointNum
The index=1
If the size==0:
Return index
Z=100.0
The range=0
For I in range (size) :
If self. Pointz [I] Z=self. Pointz [I]
Range=math.h SQRT (self pointx * * 2 + self. [I] pointy [I] * * 2)
Self. MinZ=z
Self. MinZRange=range
Return index

Hor=120
Ver=100

The grid=[]

For I in range (hor) :
The grid. Append ([])
For j in range (ver) :
The grid [I]. Append (grid (0))

PointXYZ=np. Loadtxt (" lidarData. TXT ", encoding='bytes')

I=0
For I in range (27000) :
Range=math. SQRT (pointXYZ [I] [0] * * 2 + pointXYZ [I] [1] * * 2)
GHor=int (math. Atan2 (pointXYZ [1], [I] pointXYZ [I] [0])/3.14 * 180-30)
GVer=int (range/0.25)
If gHor<120 and gHor> 1 the and gVer<100 and gVer> 1:
The grid [gHor] [gVer] AddPoint (pointXYZ [0], [I] pointXYZ [1], [I] pointXYZ [I] [2])

CodePudding user response:

The class Grid:

Pointx=[]
Pointy=[]
Pointz=[]
PointNum=0
MinZ=100
MinZRange=0

These all belong to the Grid class variables, not instance variables. Class is equivalent to the c + + classes in static variables,

So, you should put these need variables in __init__ initialization function's parameter list!

CodePudding user response:

So,

 
The class Grid: 
Pointx=[] 
Pointy=[] 
Pointz=[] 
PointNum=0 
MinZ=100 
MinZRange=0 

Def __init__ (self, pNum) : 
PointNum=pNum 
MinZ=100 
MinZRange=0

To:

 
The class Grid: 
Def __init__ (self, pNum) : 
The self. The pointNum=pNum 
Self. MinZ=100 
Self. MinZRange=0 
Self. Pointx=[] 
Self. Pointy=[] 
Self. Pointz=[]

Other places stayed the same!