python内存释放原则

Mrfei

def getInit(class_name):
"""动态加载模块"""
resultmodule = __import__(class_name, globals(), locals(), [class_name])
resultclass = getattr(resultmodule, class_name)
return resultclass()
import threading, time
class b:
def __init__(self, *args, **kwargs):        
self.name = "b"
self.class_name = "a"
print "%s is inited" % (self.name)
def __del__(self):
print "%s is deleted" % (self.name)
def other_run(self, obj=None):
if obj:
obj.run()
def run(self, *args, **kwargs):
obj = getInit(self.class_name)
obj.run()
self.other_run(obj)        
print "%s is run" % (self.name)
def treading():
n = 0
c = b()
while n<2:
n += 1
print "\n"
print "start"
c.run()
print "end"
print "\n"

if __name__ == '__main__':
param = {}
th = threading.Thread(target = treading, args = ())
th.start()
exit()



b is inited

start
a is inited
a is run
a is run
b is run
a is deleted
end


start
a is inited
a is run
a is run
b is run
a is deleted
end

b is deleted


每个循环内都把a重新加载并且释放内存


def getInit(class_name):
resultmodule = __import__(class_name, globals(), locals(), [class_name])
resultclass = getattr(resultmodule, class_name)
return resultclass()
import threading, time
import a
class b:
def __init__(self, *args, **kwargs):        
self.name = "b"
self.class_name = "a"
self.obj = getInit(self.class_name)
print "%s is inited" % (self.name)
def __del__(self):
print "%s is deleted" % (self.name)
def other_run(self):
if self.obj:
self.obj.run()
def run(self, *args, **kwargs):
self.obj.run()
self.other_run()        
print "%s is run" % (self.name)
def treading():
n = 0
c = b()
while n<2:
n += 1
print "\n"
print "start"
c.run()
print "end"
print "\n"

if __name__ == '__main__':
param = {}
th = threading.Thread(target = treading, args = ())
th.start()
exit()



a is inited
b is inited

start
a is run
a is run
b is run
end


start
a is run
a is run
b is run
end

b is deleted
a is deleted


最后结束a才释放

内存释放是根据指向的