我有两个python模块:
a.py
import b
def hello():
print "hello"
print "a.py"
print hello()
print b.hi()
b.py
import a
def hi():
print "hi"
当我运行a.py时,我得到:
AttributeError: 'module' object has no attribute 'hi'
这个误差是什么意思?我该怎么解决呢?
我有两个python模块:
a.py
import b
def hello():
print "hello"
print "a.py"
print hello()
print b.hi()
b.py
import a
def hi():
print "hi"
当我运行a.py时,我得到:
AttributeError: 'module' object has no attribute 'hi'
这个误差是什么意思?我该怎么解决呢?
当前回答
当我从git中签出一个旧版本的存储库时,我遇到了这个问题。Git替换了我的.py文件,但留下了未跟踪的.pyc文件。由于.py文件和.pyc文件不同步,.py文件中的导入命令无法在.pyc文件中找到相应的模块。
解决方案就是删除.pyc文件,并让它们自动重新生成。
其他回答
我通过引用一个以错误方式导入的enum得到了这个错误,例如:
from package import MyEnumClass
# ...
# in some method:
return MyEnumClass.Member
正确的导入:
from package.MyEnumClass import MyEnumClass
希望这能帮助到别人
对我来说,这个错误的原因是有一个文件夹与我试图导入的python模块同名。
|-- core <-- empty directory on the same level as the module that throws the error
|-- core.py
python将该文件夹视为python包,并试图从空包“core”导入,而不是从core.py导入。
似乎出于某种原因,git在切换分支时留下了空文件夹
所以我移除了那个文件夹,一切都很顺利
在ubuntu 18.04 (virtualenv, python.3.6.x)上,下面的重载代码段为我解决了这个问题:
main.py
import my_module # my_module.py
from importlib import reload # reload
reload(my_module)
print(my_module)
print(my_modeule.hello())
地点:
|--main.py
|--my_module.py
查看更多文档:这里
在我使用python 2.7和numpy 1.15.0版本工作的情况下,它与
pip install statsmodels=="0.10.0"
我曾多次遇到这个问题,但我并没有试图深入挖掘。现在我明白主要问题了。
这一次,我的问题是从不同的模块导入Serializers (django和restframework),如下所示:
from rest_framework import serializers
from common import serializers as srlz
from prices import models as mdlpri
# the line below was the problem 'srlzprod'
from products import serializers as srlzprod
我遇到了一个这样的问题:
from product import serializers as srlzprod
ModuleNotFoundError: No module named 'product'
我想要完成的是:
class CampaignsProductsSerializers(srlz.DynamicFieldsModelSerializer):
bank_name = serializers.CharField(trim_whitespace=True,)
coupon_type = serializers.SerializerMethodField()
promotion_description = serializers.SerializerMethodField()
# the nested relation of the line below
product = srlzprod.ProductsSerializers(fields=['id','name',],read_only=True,)
因此,正如上面提到的如何解决它(顶级导入),我继续做以下更改:
# change
product = srlzprod.ProductsSerializers(fields=['id','name',],read_only=True,)
# by
product = serializers.SerializerMethodField()
# and create the following method and call from there the required serializer class
def get_product(self, obj):
from products import serializers as srlzprod
p_fields = ['id', 'name', ]
return srlzprod.ProductsSerializers(
obj.product, fields=p_fields, many=False,
).data
因此,django runserver的执行没有问题:
./project/settings/manage.py runserver 0:8002 --settings=settings_development_mlazo
Performing system checks...
System check identified no issues (0 silenced).
April 25, 2020 - 13:31:56
Django version 2.0.7, using settings 'settings_development_mlazo'
Starting development server at http://0:8002/
Quit the server with CONTROL-C.
代码行的最终状态如下:
from rest_framework import serializers
from common import serializers as srlz
from prices import models as mdlpri
class CampaignsProductsSerializers(srlz.DynamicFieldsModelSerializer):
bank_name = serializers.CharField(trim_whitespace=True,)
coupon_type = serializers.SerializerMethodField()
promotion_description = serializers.SerializerMethodField()
product = serializers.SerializerMethodField()
class Meta:
model = mdlpri.CampaignsProducts
fields = '__all__'
def get_product(self, obj):
from products import serializers as srlzprod
p_fields = ['id', 'name', ]
return srlzprod.ProductsSerializers(
obj.product, fields=p_fields, many=False,
).data
希望这能对其他人有所帮助。
问候,