datatime

import datetime
a=datetime.datetime(2019,1,1)
print(a)
b=datetime.datetime.now()
print(b)
from datetime import datetime
c=datetime.strptime('2017年9月30日星期六10时28分26秒','%Y年%m月%d日星期六10时28分26秒')
print(c)
d=b.strftime('%a, %b d %H:%M')
print(d)
print('今天是{0:%y}年的第{0:%j}天'.format(datetime.now()))
from datetime import timedelta
f=a-b
print('到2019年还有{}天'.format(f.days))

　　

n=10
a=list(range(n))
b=list(range(0,5*n,5))
c=[]
for i in range(n):
    c.append(a[i]**2+b[i]**3)

print(c)

　　

#用numpy实现，并包装成函数
import numpy
def Godo(n):
    a = numpy.arange(10)
    b = numpy.arange(0,50, 5)
    c = a + b
    return(c)

print(Godo(10))




from datetime import datetime
start = datetime.now()
Godo(100000)
delta = datetime.now()-start
print(delta)

start = datetime.now()
Godo(100000)
delta = datetime.now()-start
print(delta)

 

 

 

import numpy
from datetime import  datetime
from Numpy import  numSum
from Numpy1 import   npSum
def listSum(n):
    a = numpy.arange(n)
    b = numpy.arange(0,5*n,5)
    c = numpy.array([[a,b],[a**2,b**3]])
    return (c)
print(npSum(10))
 
start = datetime.now()
listSum(100000)
time = datetime.now()-start
print(time)