Python将值保存为instancemethod而不是integer
所以,我现在正在写一个程序,随机生成一个网格迷宫。下面的代码段是网格中单个“单元”的类定义。我定义了两种getter方法Python将值保存为instancemethod而不是integer,python,python-2.7,oop,a-star,grid-search,Python,Python 2.7,Oop,A Star,Grid Search,所以,我现在正在写一个程序,随机生成一个网格迷宫。下面的代码段是网格中单个“单元”的类定义。我定义了两种getter方法get_row和get_col,它们可以检索单元格的坐标。我相信这就是问题所在 class cell: #Node storing each cell of grid def __init__(self, rowNum=None, colNum=None): self.rowNum = rowNum self.colNum = colNu
get_row
和get_col
,它们可以检索单元格的坐标。我相信这就是问题所在
class cell: #Node storing each cell of grid
def __init__(self, rowNum=None, colNum=None):
self.rowNum = rowNum
self.colNum = colNum
self.blocked = 0 # 0 denotes False, all cells are initially unblocked
self.f = 0 # Distance from start node
self.g = 0 # Distance from goal node
self.h = 0 # Total cost ( h = f + g )
self.parent = None
def get_row(self):
return self.rowNum
def get_col(self):
return self.colNum
def isBlocked(self):
if self.blocked == 0:
return 0
if self.blocked != 0:
return 1
然后,我使用下面的线段遍历网格,并随机确定某些正方形作为起点和终点。我将这些坐标保存为start\u row
,start\u col
,end\u row
和end\u col
# List containing all the unblocked cells
unblockedCells = [cell() for i in range(numUnblocked)]
start_row = -1
start_col = -1
end_row = -1
end_col = -1
# Randomly picks 2 unblocked cells to be the starting and ending point
def set_start_and_end():
global start_row
global start_col
global end_row
global end_col
ctr1 = 0
for i in range(totalRows):
for j in range(totalCols):
if cellsArray[i][j].blocked == 0:
unblockedCells[ctr1] = cellsArray[i][j]
ctr1 = ctr1+1
#Initialize start position
startIndex = random.randint(0,len(unblockedCells)-1)
start_row = unblockedCells[startIndex].get_row
start_col = unblockedCells[startIndex].get_col
#Initialize target position
endIndex = random.randint(0, len(unblockedCells)-1)
end_row = unblockedCells[endIndex].get_row
end_col = unblockedCells[endIndex].get_col
print("Start: (",start_row,", ",start_col,") End: (",end_row,", ",end_col,")")
set_start_and_end()
但是,当我稍后在程序中尝试访问start\u row
和start\u col
的值时,我收到错误列表索引必须是整数,而不是instancemethod
我的问题是,为什么start\u行和start\u列被存储为instancemethod而不是整数?这里有一个小片段来说明不同的选项
class Cell:
"""Doc strings go here btw, not as comments. Also take a look at pep8 naming conventions: https://www.python.org/dev/peps/pep-0008/#naming-conventions"""
def __init__(self, row_num = None, col_num = None):
self.row_num = row_num # A public instance member - you can get and set this directly without the need for function
self._col_num = col_num # A private member. By convention, you should not get or set this directly
def get_row(self):
"""This is a method, you need so call it using parenthesis i.e. .get_row()"""
return self.row_num
@property
def col_num(self):
"""This is property being used to expose a private member. You don't need parenthesis to call it."""
return self._col_num
my_cell = Cell(1, 2)
print(my_cell.row_num) # row_num is a public member, you can just access it directly
print(my_cell.get_row) # get_row is a method, so this will print the actual function
print(my_cell.get_row()) # this calls the function and prints the integer
print(my_call.col_num) # because of the property decorator, we don't have to call this function but can treat is as if it was a member. But note it would be weird to name it get_... now as verbs imply functions.
在您的情况下,我将只使用公共实例成员。您不需要任何功能。事实上,整个物体看起来就像是一个:
或者如果您使用的是python>=3.8a
unbuckedcells[startIndex].get\u row
是一个实例方法。您需要使用()
准确地调用该方法,即unchedcells[startIndex]。get_row()
是实例方法的返回值(即int)。或者,您可以使用@属性来装饰getter,这样您就不需要()
。尽管您的getter方法毫无意义,因为self.rowNum
etc是公共成员。也不要使用global
。此外,您的代码段中还有大量似乎未分配到任何位置的变量?谢谢,那么我是否应该改用unceedcells[startIndex].rowNum?你能解释一下如何使用@propertyse吗?请看我的答案。但是是的,您应该只使用unbuckedcells[startIndex].rowNum
,因为这些函数没有意义。谢谢!这很有帮助
from typing import NamedTuple
class Cell(NamedTuple):
row: int
col: int
blocked: bool
from dataclasses import dataclass
@dataclass
class Cell:
row = None
col = None
blocked = False