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python中檢視程式執行的時間

import datetime 
start = datetime.datetime.now() 
run_function(): # do something 
end = datetime.datetime.now() 
print (end-start) 

方法2:

import time
start = time.time()
run_function()
end = time.time()

print str(end)

方法3:

start = time.clock()
run_function()
end = time.clock()

print str(end-start)