Question

我正在从书中做教程。但我有错误。我的class属性不可见。我的代码：

    class SimpleGradebook():
        def _init_(self, value = {}):
           self._grades = value

        def add_student(self,name):
           self._grades[name] = []


    book = SimpleGradebook()
    book.add_student('test')

它说：print（book._grades） AttributeError：＆＃39; SimpleGradebook＆＃39;对象没有属性＆＃39; _grades＆＃39;

Answer 1

python -u otherScript.py --oneParameter one --twoParameter two --threeParameter three --fourParameter four python -u otherScript.py --oneParameter one --twoParameter two --threeParameter three --fourParameter four python -u otherScript.py --oneParameter one --twoParameter two --threeParameter three python -u otherScript.py --oneParameter one --twoParameter two python -u otherScript.py --oneParameter one上需要两个下划线：

__init__

Answer 2

初始化的每一侧只有1 -。它应该是这样的：

class SimpleGradebook():
    def __init__(self, value = {}):
       self._grades = value

    def add_student(self,name):
       self._grades[name] = []


book = SimpleGradebook()
book.add_student('test')

Python字典初始化

2 个答案: