Python 在类内调用函数以设置list的元素
我正在尝试实现我的第一堂课,部分原因是为了打破一个数学问题的建模和解决。我认为我的问题与班级无关,但是 错误一直告诉我:“NameError:未定义全局名称‘corner2’” 我尝试移动函数调用,但它仍然无法识别它,因此我将它放回我的init函数的列表声明中 这是我的密码:Python 在类内调用函数以设置list的元素,python,list,class,methods,call,Python,List,Class,Methods,Call,我正在尝试实现我的第一堂课,部分原因是为了打破一个数学问题的建模和解决。我认为我的问题与班级无关,但是 错误一直告诉我:“NameError:未定义全局名称‘corner2’” 我尝试移动函数调用,但它仍然无法识别它,因此我将它放回我的init函数的列表声明中 这是我的密码: class RotatedRectangle(object): def corner1(a,b): a/=2 b/=2 x=(a-b)*math.sin(math.pi/4) y=(a+b
class RotatedRectangle(object):
def corner1(a,b):
a/=2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner2(a,b):
a/=-2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner3(a,b):
a/=-2
b/=-2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner4(a,b):
a/=2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def __init__(self, a, b,):
"""Return a Rotated rectangle object whose name is a function of a and b."""
self.name = str(a) + "," + str(b) + "-rectangle"
self.corners = [corner1(a,b), corner2(a,b), corner3(a,b), corner4(a,b)]
"""A rectangle with sides equal to even integers a and b is drawn on the Cartesian plane.Its center (the intersection point of its diagonals) coincides with the point (0, 0),but the sides of the rectangle are not parallel to the axes; instead, they are forming 45 degree angles with the axes.
How many points with integer coordinates are located inside the given rectangle (including on its sides)? """
您有一些识别错误,并且忘记添加self参数,它应该是:
import math
class RotatedRectangle(object):
def __init__(self, a, b,):
"""Return a Rotated rectangle object whose name is a function of a and b."""
self.name = str(a) + "," + str(b) + "-rectangle"
self.corners = [self.corner1(a,b), self.corner2(a,b), self.corner3(a,b), self.corner4(a,b)]
def corner1(self,a,b):
a/=2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner2(self,a,b):
a/=-2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner3(self,a,b):
a/=-2
b/=-2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner4(self,a,b):
a/=2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
我强烈建议您阅读此问题和所有答案在Python中定义类的方法时,第一个参数通常设置为“self”。然后,在调用该方法时,在其前面加上
self.
以下是工作代码:
import math
class RotatedRectangle(object):
def corner1(self,a,b):
a/=2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner2(self,a,b):
a/=-2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner3(self,a,b):
a/=-2
b/=-2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def corner4(self,a,b):
a/=2
b/=2
x=(a-b)*math.sin(math.pi/4)
y=(a+b)*math.sin(math.pi/4)
return (x,y)
def __init__(self, a, b,):
"""Return a Rotated rectangle object whose name is a function of a and b."""
self.name = str(a) + "," + str(b) + "-rectangle"
self.corners = [self.corner1(a,b), self.corner2(a,b), self.corner3(a,b), self.corner4(a,b)]
- 必须使用self作为类方法的第一个参数
- 在类内调用类方法时,必须将self作为其第一个参数传递(以便类知道您在谈论当前对象)
- 在类中定义方法时必须缩进
import math class RotatedRectangle(object): def corner1(self,a,b): a/=2 b/=2 x=(a-b)*math.sin(math.pi/4) y=(a+b)*math.sin(math.pi/4) return (x,y) def corner2(self,a,b): a/=-2 b/=2 x=(a-b)*math.sin(math.pi/4) y=(a+b)*math.sin(math.pi/4) return (x,y) def corner3(self,a,b): a/=-2 b/=-2 x=(a-b)*math.sin(math.pi/4) y=(a+b)*math.sin(math.pi/4) return (x,y) def corner4(self,a,b): a/=2 b/=2 x=(a-b)*math.sin(math.pi/4) y=(a+b)*math.sin(math.pi/4) return (x,y) def __init__(self, a, b,): """Return a Rotated rectangle object whose name is a function of a and b.""" self.name = str(a) + "," + str(b) + "-rectangle" self.corners = [self.corner1(a,b), self.corner2(a,b), self.corner3(a,b), self.corner4(a,b)]