导入错误：无法导入名称 X - ImportError: Cannot import name X

问题：

I have four different files named: main.py , vector.py , entity.py and physics.py .我有一个名为四种不同的文件： main.py ， vector.py ， entity.py和physics.py 。 I will not post all the code, just the imports, because I think that's where the error is (If you want, I can post more).我不会发布所有代码，只会发布导入，因为我认为这就是错误所在（如果您愿意，我可以发布更多）。

main.py:主要.py：

import time
from entity import Ent
from vector import Vect
#the rest just creates an entity and prints the result of movement

entity.py:实体.py：

from vector import Vect
from physics import Physics
class Ent:
    #holds vector information and id
def tick(self, dt):
    #this is where physics changes the velocity and position vectors

vector.py:矢量.py：

from math import *
class Vect:
    #holds i, j, k, and does vector math

physics.py:物理.py：

from entity import Ent
class Physics:
    #physics class gets an entity and does physics calculations on it.

I then run from main.py and I get the following error:然后我从main.py运行，我收到以下错误：

Traceback (most recent call last): File "main.py", line 2, in <module> from entity import Ent File ".../entity.py", line 5, in <module> from physics import Physics File ".../physics.py", line 2, in <module> from entity import Ent ImportError: cannot import name Ent

I'm guessing that the error is due to importing entity twice, once in main.py , and later in physics.py , but I don't know a workaround.我猜的错误是由于进口单位两次，一次在main.py ，后来在physics.py ，但我不知道一个解决办法。 Can anyone help?任何人都可以帮忙吗？

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解决方案：

参考一： https://stackoom.com/question/cp0Z
参考二： ImportError: Cannot import name X