self.__foo = foo,双下划线为私有属性
# 类的方法和属性的访问权限
class Test:
def __init__(self, foo):
self.__foo = foo
def __bar(self):
print(self.__foo)
print('__bar')
# __bar,__foo无法在外部访问
def main():
test = Test('hello')
test.__bar() # AttributeError: 'Test' object has no attribute '__bar'
print(test.__foo) # AttributeError: 'Test' object has no attribute '__foo'
if __name__ == '__main__':
main()
