python动态加载是否影响性能
- 说明
看见这个标题觉得有些好笑。受先入为主观念影响，心里隐约觉得动态加载有点慢，最近受一些启发，开始思考java反射、python动态加载的性能问题. 下面是测试python不同加载方式的性能
- 示例
有m1.py m2.py m3.py三个文件，内容如下
class Test:
def func(self):
pass
测试主体
#encoding=utf-8
import time
import importlib
import m1
from m3 import Test as m3_Test
class Test:
def func(self):
pass
def main():
#A import
nums = range(1, pow(10, 7))
start = time.time()
for i in nums:
m1.Test()
end = time.time()
print "%sms" % (( end - start ) * 1000)
#B import_module
im = importlib.import_module("m2")
start = time.time()
for i in nums:
im.Test()
end = time.time()
print "%sms" % ((end - start) * 1000)
#C from import
start = time.time()
for i in nums:
m3_Test()
end = time.time()
print "%sms" % ((end - start) * 1000)
#D 当前类
start = time.time()
for i in nums:
Test()
end = time.time()
print "%sms" % ((end - start) * 1000)
if __name__ == "__main__":
main()
'''
结果
1619.62890625ms
1586.80582047ms
1359.44890976ms
1369.25506592ms
'''
- 结论
可以得到几点结论:
- A与B比较: 动态加载并不会慢
- A与C比较: 通过from减少导入内容，可以加快载入速度
python本身就是动态语言，动态加载不会对性能产生影响，所以，尽管用，这是非常好的一个特性.
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