# 为什么要用numpy

• Python中提供了list容器，可以当作数组使用。但列表中的元素可以是任何对象，因此列表中保存的是对象的指针，这样一来，为了保存一个简单的列表[1,2,3]。就需要三个指针和三个整数对象。对于数值运算来说，这种结构显然不够高效。
• Python虽然也提供了array模块，但其只支持一维数组，不支持多维数组，也没有各种运算函数。因而不适合数值运算。
• NumPy的出现弥补了这些不足。

## while loops

```i = 0
numbers = []

while i < 6:
print "At the top i is %d" % i
numbers.append(i)

i = i + 1
print "Numbers now: ", numbers
print "At the bottom i is %d" % i

print "The numbers: "

for num in numbers:
print num，```

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(1)数组加法：array([20,31,42,53])=array([20,30,40,50])+array([0,1,2,3])

```from numpy import *
a=array([20,30,40,50])
b=arange(4)
a+b```

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