我正在尝试制作一个脚本,我应该在其中制作一个 Dot 类,它采用 X 位置、Y 位置和颜色。我已经制作了类(class)和所有与之配套的方法。我遇到的问题是如何应用该方法。这是我所做的:
class Dot:
'''A class that stores information about a dot on a flat grid
attributes: X (int) Y (int), C (str)'''
def __init__(self, xposition, yposition, color):
'''xposition represents the x cooridinate, yposition represents
y coordinate and color represent the color of the dot'''
self.X = xposition
self.Y = yposition
self.C = color
def __str__(self):
"Creates a string for appropiate display to represent a point"
return str(self.X) + " " + str(self.Y) + " " + str(self.C)
def move_up(self,number):
'''Takes an integer and modifies the point by adding the given
number to the x-coordinate
attributes: number (int)'''
self.Y = number + self.Y
def move_right(self,number):
'''Takes an integer and modifies the Point by adding the given number to the y-coordinate
attributes: number (int)'''
self.X = number + self.X
def distance_to(point2):
'''Takes another Dot and returns the distance to that second Dot
attributes: X (int) Y (int)'''
distance = ((self.X - point2.X )**2) + ((self.Y - point2.Y)**2)
real_distance = distance.sqrt(2)
return real_distance
point1 = (2,3,"red")
print("Creates a" + " " + str(point1[2]) + " " + "dot with coordinates (" + str(point1[0]) + "," + str(point1[1]) + ")")
point2 = (1,2,"blue")
print("Creates a" + " " + str(point2[2]) + " " + "dot with coordinates (" + str(point2[0]) + "," + str(point2[1]) + ")")
new_point = point1.move_up(3)
print("Moves point up three on the y axis")
这是返回的内容:
AttributeError: 'tuple' object has no attribute 'move_up'
最佳答案
您永远不会实例化 Dot
对象,您创建了一个包含 3 个元素的元组。将其更改为:
point1 = Dot(2,3,"red")
point2 = Dot(1,2,"blue")
而不是
print("Creates a" + " " + str(point1[2]) + " " + "dot with coordinates (" + str(point1[0]) + "," + str(point1[1]) + ")")
使用
print "Creates a" + " " + point1.C + " " + "dot with coordinates (" + str(point1.X) + "," + str(point1.Y) + ")"
顺便说一句,.format()
语法更清晰:
print "Creates a {0} dot with coordinates ({1}, {2})".format(point1.C, point1.X, point1.Y)
关于python - 在定义的类中使用方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29400797/