Python中Timeit和Time之间的差异

from time import time
start = time()
# some process
print time() - start

和：

from timeit import timeit
def my_funct():
    # some process
print timeit(my_funct,number=1)

举个例子,我将使用Project Euler 1(因为它很容易理解/解决)

def pE1test1(): # using time()
    from time import time
    start = time()
    print sum([n for n in range(1,1000) if n%3==0 or n%5==0])
    print time() - start

def pE1test2(): # using timeit
    print sum([n for n in range(1,1000) if n%3==0 or n%5==0])

from timeit import timeit
pE1test1()
print timeit(pE1test2,number=1)

这输出：

>>> 
233168
0.0090000629425
233168
0.00513921300363

时间和时间之间的主要区别是什么？