Python AttributeError:类对象没有属性 [英] Python AttributeError: class object has no attribute
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问题描述
当我尝试运行正在编写的类的代码时,我得到一个 AttributeError
,但我不确定为什么.具体错误如下:
When I try to run the code of a class I'm writing, I get an AttributeError
and I'm not sure why. The specific error is as follows:
self.marker = self.markers[marker[1:]]
AttributeError: 'TTYFigureData' object has no attribute 'markers'
这是我正在编写的课程的一部分:
Here is part of the class I'm writing:
class TTYFigureData(object):
"""
data container of TTYFigure
"""
def __init__(
self,
x, # x values
y, # y values
marker = "_.", # datum marker
plot_slope = True
):
self.x = x
self.y = y
self.plot_slope = plot_slope
self.set_marker(marker)
self.markers = {
"-" : u"None" ,
"," : u"\u2219"
}
def set_marker(
self,
marker
):
if marker in [None, "None", u"None", ""]:
self.plot_slope = True
self.marker = ""
elif marker[0] == "_":
self.marker = self.markers[marker[1:]]
else:
self.marker = marker
我要去哪里错了?
推荐答案
Martijn的答案解释了问题并给出了最小的建议解决方案.但是,考虑到 self.markers
似乎是常量,我将其设为 class属性,而不是为每个实例重新创建它:
Martijn's answer explains the problem and gives the minimal solution. However, given that self.markers
appears to be constant, I would make it a class attribute rather than recreating it for every instance:
class TTYFigureData(object):
"""Data container of TTYFigure."""
MARKERS = {
"-": u"None" ,
",": u"\u2219",
}
def __init__(self, x, y, marker='_.', plot_slope=True):
"""Document parameters here as required."""
self.x = x
self.y = y
self.plot_slope = plot_slope
self.set_marker(marker)
def set_marker(self, marker):
"""See also here - usage guidance is also good."""
if marker in [None, "None", u"None", ""]:
self.plot_slope = True
self.marker = ""
elif marker[0] == "_":
self.marker = self.MARKERS[marker[1:]]
else:
self.marker = marker
(请注意,更改样式还应符合官方指南)
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