循环导入问题

m1.py

print('from m1.py')

def func1():
from m2 import x
print(x)

y = 'm1'

m2.py

print('from m2.py')

def func1():
from m1 import y
print(y)

x = 'm2'

来源：https://www.cnblogs.com/zhouxuchong/p/11564814.html