跨模块变量引用

[御弟卡特]

各位大神，跨模块变量(同一个目录下)如何引用呢，我始终引用不正确
Study.py

class School(object):
    def add(self):
        a = 5
        b = 7
        c = a + b
        print(c)
if __name__ == "__main__":
    eq = School()
    eq.add()

dzl.py

def book():
    f = 10
    """这里a是要引用Study中的a变量"""
    e = a * f
    print(e)
if __name__ == "__main__":
    book()

请问各位大神该如何引用呢？

[sanGuo_uu]

大概像这样 Study.py

class School(object):
	def __init__(self):
		self.a=5
		self.b=7

	def add(self):
		print(self.a+self.b)

dzl.py

import anki

def book():
	f=10
	tmp=anki.School()
	e=tmp.a*f
	print(e)
book()

[sanGuo_uu]

import Study 忘改了

[ToF君]