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              Python數據分析之路如何走?

              數據分析準備工作

              1.數據分析工具

              • 工欲善其事,必先利其器,網上有很多關于數據剖析的文章,置信大家一定聽過R言語和Python之爭,而且各有所長,R言語在學術界更盛行,但是在做項目上面我個人比擬喜歡Python,Python更通用,更簡約,文檔也很多,而且有大量的庫特別是Google,Facebook都開源了很多功用強大的庫,十分不錯.所以言語我們選Python.
              • 開發工具的話,建議大家用Anaconda,是一個強大的科學計算的Python發行版,首推數據分析開發工具.支持 Linux, Mac, Windows系統,提供了包管理與環境管理的功能,可以很方便地解決多版本python并存、切換以及各種第三方包安裝問題。推薦使用里面的spyder和Jupyter Notebook非常不錯,界面美觀而且調試方便

              2.數據分析的庫

              Python數據分析這么流行,其中跟兩個第三方的庫非常相關,一個是Numpy,一個是Pandas,這兩個庫如果你要做數據分析,必須要熟練掌握使用~~

              • Numpy偏數組多一點,特別是多維數組,矩陣,非常靈活方便.內置了大量的矩陣的操作,對于科學計算來說簡直就是神器.
              • Pandas偏series多一點,而且跟時序相關,內置了大量庫和一些標準的數據模型,特別是對于大型的數據的處理,非常的高效和快捷.
              • 比如對于一個1000萬行的CVS數據的處理,用字典去處理大概需要60幾秒,而pandas只需要4秒,而且代碼行更少.以后我們會用實戰例子去證明這一點

              當然上面都是一些入門必學技能,繼續修煉的話需要了解大數據的處理,以及一些機器學習的庫sk-learn和深度學習的一些框架

              Python數據分析之路如何走?

              初探numpy

              3.什么是NumPy

              1).Numpy全稱叫Numeric Python,聽名字就知道跟數值有關,沒錯numpy,提供了許多高級的數值編程工具,如:矩陣運算、多維數組,矢量運算,線性代數,隨機數的生成,均方差等這些科學計算操作非常方便.

              2).Ndarray 對象

              Numpy里面有一個最最有名的Ndarray對象,幾乎所有的操作都圍繞這個Ndarray來,也叫多維數組.

              數組是主流語言的標配數據結構,Python中的列表其實也是這樣的一種數據結構,但是列表跟數組不一樣;比如列表的元素可以是任意的類型,列表需要保存每個對象的指針和對象,很浪費內存空間,而且不支持多維數組

              Ndarray會支持多維數組,而且數組之間的轉換非常方面,內置了很多高效的內建函數,都是用C寫的,有利于節省內存和提高CPU的計算時間.比如需要計算一百萬數據的正弦函數用numpy比python里的標準函數要快近10倍~~

              4.Ndarray和Python list的相似之處

              Python數據分析之路如何走?

              import numpy

              n1=numpy.array([‘AA’,’BB’,’CC’,’DD’,’EE’])

              list1=[‘AA’,’BB’,’CC’,’DD’,’EE’]

              a).都可以通過下標去訪問

              print n1[0]

              >>’AA’

              print list1[0]

              >>’AA’

              b).都可以切片去訪問

              n1=numpy.array([‘AA’,’BB’,’CC’,’DD’,’EE’])

              list1=[‘AA’,’BB’,’CC’,’DD’,’EE’]

              print n1[1:3]

              >>[‘BB’ ‘CC’]

              print list1[1:3]

              >>[‘BB’, ‘CC’]

              c).都可以用循環處理

              n1=numpy.array([1,2,3,4])

              for n in n1:

              print n

              >>

              1

              2

              3

              4

              5.Ndarray和Python list的不同之處

              a).Ndarray里面的元素必須是同一種類型

              (int,float,string_,bool, …)

              要么都是int,要么都是float,要么都是字符串

              n1=np.array([‘a’,’b’,’c’,100])

              >>

              [‘a’ ‘b’ ‘c’ ‘100’]

              因為ndarray要求所以的類型必須一樣,你會發現100變成了字符串’100′

              b).矢量運算

              比如相加

              a1=np.array([1,2,3])

              a2=np.array([4,5,6])

              print a1+a2

              >>[5,7,9]

              而類似的加操作在list中

              list1=[1,2,3]

              list2=[4,5,6]

              print list1+list2

              >>[1,2,3,4,5,6]

              比如相乘

              a1=np.array([1,2,3])

              print a1*3

              >>[3,6,9]

              而類似的操作在list中

              a1=[1,2,3]

              print a1*3

              >>[1,2,3,1,2,3,1,2,3]

              比如乘方

              先產生3*3矩陣,每個數字都是0-9之間

              arr1=np.random.randint(0,10,(3,3))

              print arr1

              >>

              [[6 7 5]

              [9 6 0]

              [5 5 9]]

              arr2=arr1**2

              print arr2

              >>

              [[36 49 25]

              [81 36 0]

              [25 25 81]]

              c).內置了一些通用(ufunc)函數

              比如max(),min(),argmax(),argmin(),mean()計算中位數,std()計算均方差等函數

              Python數據分析之路如何走?

              留一個思考題

              題目一:

              a=np.array([1,2,3,4,5])

              b=a

              a+=np.array([1,1,1,1,1])

              print b

              題目二:

              a=np.array([1,2,3,4,5])

              b=a

              a=a+np.array([1,1,1,1,1])

              print b

              看看題目一和題目二的print b的結果是什么,會一樣嗎?


              Python數據分析起航篇就講到這里,是不是覺得numpy蠻強大的~~這只是開始,今天的文章希望能給初學者一些啟發。

               

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