Question

当我尝试运行此python代码时：

def convertProjection(self,x,y,from_crs,to_crs):
    crsSrc = QgsCoordinateReferenceSystem(from_crs)
    crsDest = QgsCoordinateReferenceSystem(to_crs)
    xform = QgsCoordinateTransform(crsSrc, crsDest)
    pt = xform.transform(QgsPoint(x,y))
    return pt.x, pt.y

# Remove the "EPSG:" part

from_crs = 3857
to_crs = 4326
x = -11705274.6374
y = 4826473.6922
lon, lat = self.convertProjection(x,y,from_crs,to_crs)

此错误发生者：

/usr/bin/python3.5 /home/jithin/PycharmProjects/PythonTests/XYTOLatLong_Conversion.py
Traceback (most recent call last):
  File "/home/jithin/PycharmProjects/PythonTests/XYTOLatLong_Conversion.py", line 36, in <module>
    lon, lat = self.convertProjection(x,y,from_crs,to_crs)
NameError: name 'self' is not defined

感谢您的帮助。...谢谢...

Answer 1

好像您从一个类复制了该代码。

在Python中，按照惯例（PEP 8），“自我”是指对象的当前实例。如果您的代码在类之外，则不会定义self，因为没有实例。

您应该更改

def convertProjection(self,x,y,from_crs,to_crs):

到

def convertProjection(x,y,from_crs,to_crs):

，然后在没有“ self”的情况下调用该函数。

Answer 2

convertProjection是在类外部定义的常规函数，因此您不应将其用作绑定方法。

更改：

def convertProjection(self,x,y,from_crs,to_crs):

收件人：

def convertProjection(x,y,from_crs,to_crs):

并更改：

lon, lat = self.convertProjection(x,y,from_crs,to_crs)

到

lon, lat = convertProjection(x,y,from_crs,to_crs)

为什么会出现NameError：名称“ self”未定义？

2 个答案: