数据分析1：Ipython开始使用

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开始随着书敲代码中文为自己的说明

%对于其中的一些代码，需要加强，需要知道其中核心的内容

Ipython的核心和将来的有什么关系？

强大的交互式 shell
Jupyter 内核
交互式的数据可视化工具
灵活、可嵌入的解释器
易于使用，高性能的并行计算工具

2017年3月18日20:27:34

In [6]: data = { i:randn() for i in range(7)}？
File "<ipython-input-6-80251b2a0667>", line 1
    data = { i:randn() for i in range(7)}？
                                         ^
SyntaxError: invalid character in identifier

In [7]: data = { i:randn() for i in range(7)}
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-7-33735cdc117f> in <module>()
----> 1 data = { i:randn() for i in range(7)}

<ipython-input-7-33735cdc117f> in <dictcomp>(.0)
----> 1 data = { i:randn() for i in range(7)}

NameError: name 'randn' is not defined
% 类似于宏定义
In [8]: from numpy.random import randn

In [9]: data = { i:randn() for i in range(7)}

In [10]: data
Out[10]:
{0: -1.640329289477435,
1: 1.912119584533592,
2: 0.3835946916397442,
3: 0.018283085098808157,
4: -1.761440585549375,
5: 1.6578387255001164,
6: -1.8105769589919776}

In [11]: data
Out[11]:
{0: -1.640329289477435,
1: 1.912119584533592,
2: 0.3835946916397442,
3: 0.018283085098808157,
4: -1.761440585549375,
5: 1.6578387255001164,
6: -1.8105769589919776}

In [12]: data = { i:randn() for i in range(7)}

In [13]: data
Out[13]:
{0: -0.923846159177959,
1: -0.054252818801742916,
2: -0.3408199935307357,
3: 0.22822142515372199,
4: -1.3665779951714367,
5: 0.4545302265741419,
6: 0.04417496778781516}

In [14]: data = { i:randn() for i in range(7)}

In [15]: data
Out[15]:
{0: 0.8545092282913335,
1: 0.3468775600070686,
2: 0.739843365259256,
3: 0.47291342283770227,
4: 0.7247730517443985,
5: 0.499666086694808,
6: 0.5246977143102812}

In [16]:

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