Python3.4类成员类型注解引发SyntaxError报错求助（相机 resectioning场景）

这个报错的核心原因很明确：Python 3.4不支持你使用的类变量类型注解语法，这种变量名: 类型的写法是PEP 484在Python 3.5才正式引入的特性，3.4版本完全不兼容。另外你定义Point和PointWithCorrespondence的方式也不符合类型注解的规范，我来一步步帮你解决：

问题拆解 #

1. 类型注解版本不兼容：_pointsPerFrame : [[PointWithCorrespondence]]这种写法是Python 3.5+才支持的类变量类型标注，3.4会直接判定为语法错误。
2. 类型别名定义错误：你用Point = (float, float)的方式试图定义类型别名，但这在Python里只是创建了一个普通元组，不是类型提示，正确的类型别名需要用typing模块的Tuple来定义（同样，typing模块是Python 3.5才内置的，3.4需要手动安装）。

解决方案 #

方案1：升级到Python 3.5+（推荐） #

Python 3.4已经停止维护多年，升级到更高版本不仅能解决这个问题，还能获得更多新特性和安全更新。修正后的代码如下：

from typing import Tuple, List

class PointsCorrespondence:
    """ Stores the point of a specific index. """
    # A point is represented as (coordinate X, coordinate Y)
    Point = Tuple[float, float]
    # A point with corresponding same point is represented as (coordinates, index of the corresponding point or -1 if there is no corresponding point).
    PointWithCorrespondence = Tuple[Point, int]
    # Contains the points represented as one list of notable points for each frame.
    _pointsPerFrame : List[List[PointWithCorrespondence]]
    def __init__(self, pointsPerFrame : List[List[PointWithCorrespondence]]):
        self._pointsPerFrame = pointsPerFrame

方案2：保留Python 3.4的处理方式 #

如果必须使用3.4版本，有两种可选方式：

方式A：用注释替代类型注解

去掉代码中的类型标注语法，改用注释来说明类型：

class PointsCorrespondence:
    """ Stores the point of a specific index. """
    # A point is represented as (coordinate X, coordinate Y)
    # Point format: (float, float)
    # A point with corresponding same point: ((float, float), int)
    # (int is index of corresponding point, -1 if no match)
    def __init__(self, pointsPerFrame):
        # pointsPerFrame: list[list[tuple[tuple[float, float], int]]]
        self._pointsPerFrame = pointsPerFrame

方式B：安装第三方typing模块实现类型提示

先通过pip安装兼容3.4的typing模块：

pip install typing

然后修改代码，用注释标注类型（因为3.4还是不支持类变量的: 类型写法）：

from typing import Tuple, List

class PointsCorrespondence:
    """ Stores the point of a specific index. """
    # A point is represented as (coordinate X, coordinate Y)
    Point = Tuple[float, float]
    # A point with corresponding same point is represented as (coordinates, index of the corresponding point or -1 if there is no corresponding point).
    PointWithCorrespondence = Tuple[Point, int]
    def __init__(self, pointsPerFrame):
        # type: (List[List[PointWithCorrespondence]]) -> None
        self._pointsPerFrame = pointsPerFrame

内容的提问来源于stack exchange，提问作者Kamal El-Saaid