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尽管导入, 类没有定义
原标题:Class is not defined despite being imported

我似乎遇到了一个非常令人困惑的错误。 Python尽管导入了包含我班级的.py 文件,但坚持说该班实际上不存在。

测试模块. py 中的类定义 :

class Greeter:
    def __init__(self, arg1=None):
        self.text = arg1

    def say_hi(self):
        return self.text

主. py :

#!/usr/bin/python
import testmodule

sayinghi = Greeter("hello world!")
print(sayinghi.say_hi())

我有一个理论认为进口品没有按应该的那样有效。 我如何正确做到这一点呢?

问题回答

使用完全合格名称:

sayinghi = testmodule.Greeter("hello world!")

import 有另一种形式,将 Greeter 带入你的命名空间:

from testmodule import Greeter
imp或t testmodule
# change to
from testmodule imp或t Greeter

imp或t testmodule
sayinghi = Greeter("hello w或ld!")
# change to
imp或t testmodule
sayinghi = testmodule.Greeter("hello w或ld!")

You imp或ted the module/package, but you need to reference the class inside it.

您也可以用这个来代替

from testmodule imp或t *

but then beware of namespace pollution





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