我想使用val picker = Builder.datePicker()
picker.addOnPositiveButtonClickListener { selection: Long ->
saveListPosition()
accountDetailsPresenter.editDate(selection, transaction, product, "")
}
picker.show(childFragmentManager, picker.toString())
函数访问上下文管理器定义之外的变量。
我有:
context.py
eval
main.py
class Context:
def __init__(self, arg1):
self.arg1 = arg1
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
print(eval(self.arg1))
脚本from context import Context
a = 'outside context'
with Context(arg1='a') as c:
pass
应该已经访问了变量main.py
,但是我遇到了以下错误。
a
是否仅通过将变量名传递给另一个模块中的函数或类来访问变量Traceback (most recent call last):
File "c:/code/context-test/main.py", line 8, in <module>
pass
File "c:\code\context-test\context.py", line 9, in __exit__
print(eval(self.arg1))
File "<string>", line 1, in <module>
NameError: name 'a' is not defined
?
提前谢谢!
编辑最终,我想做类似的事情,然后在退出时在上下文管理器中对a
进行操作。
a