데이터 처리 패키지 판다스 일반 문

Bryan 블로그에서
# coding=gbk  
''''' 
Created on 2016 6 1  

@author: bryan 
'''  
import pandas as pd  
import numpy as np  
import matplotlib.pyplot as plt  
# 1、        list       Series,pandas         :  
# s=pd.Series([1,3,5,np.nan,6,8])  
# print(s)  
#   
# # 2、      numpy array,              DataFrame:  
# dates=pd.date_range('20130101',periods=6)  
# print(dates)  
# df=pd.DataFrame(np.random.randn(6,4),index=dates,columns=list('ABCD'))  
# print(df)  
#   
# # 3、                            DataFrame:  
# df2=pd.DataFrame({'A':1,'B':pd.Timestamp('20130102'),  
#                   'C':pd.Series(1,index=list(range(4)),dtype='float32'),  
#                   'D':np.array([3]*4,dtype='int32'),  
#                   'E':pd.Categorical(['test','train','test','train']),  
#                   'F':'fool'  
#                   })  
# print(df2)  
# # 4、          :  
# print(df2.dtypes)  
#   
#   
#   
#   
# # 1、    frame        :  
# print(df.head(1))  
# print(df.tail(1))  
#   
# # 2、      、     numpy  :  
# print(df.index)  
# print(df.columns)  
# print(df.values)  
#   
# # 3、  describe()             :  
# print(df.describe())  
#   
# # 4、        :  
# print(df.T)  
#   
# # 5、          
# print(df.sort_index(axis=1,ascending=False))  
#   
# # 6、          
# print(df.sort(columns='B'))  
#   
#   
#   
#   
#   
# # l      
# #   
# # 1、         ,       Series,   df.A:  
# print(df['A'])  
#   
# # 2、   []    ,           
# print(df[:3]) #   0     print(df[0:3])  
#   
# # l          
# #   
# # 1、                 
# print(df.loc[dates[0]])  
#   
# # 2、                 
# print(df.loc[:,['A','B']])  
#   
# # 3、       
# print(df.loc['20130102':'20130104',['A','B']])  
#   
# # 4、                
# print(df.loc['20130101',['A','B']])  
#   
# # 5、         
# print(df.loc[dates[0],'A'])  
#   
# # 6、         (        )  
# print(df.at[dates[0],'A'])  
#   
# # l          
# #   
# # 1、             (     )  
# print(df.iloc[3])  
#   
# # 2、         , numpy/python        
# print(df.iloc[3:5,0:2])  
#   
# # 3、            , numpy/python        
# print(df.iloc[[1,2,4],[0,2]])  
#   
# # 4、         
# print(df.iloc[1:3,:])  
#   
# # 5、         
# print(df.iloc[:,1:3])  
#   
# # 6、         
# print(df.iloc[1,1])  
#   
# # l        
# #   
# # 1、               :  
# print(df[df.A>0])  
#   
# # 2、   where       :  
# print(df[df>0])  
#   
# # 3、   isin()     :  
# df2=df.copy()  
# df2['E']=['one','one','one','one','one','two']  
# print(df2)  
#   
# # l      
# #   
# # 1、        :  
# s1=pd.Series([1,2,3,4,5,6],index=pd.date_range('20130101', periods=6))  
#   
# print(s1)  
# df['F']=s1  
# print(df)  
#   
# # 2、          :  
# df.at[dates[0],'A']=0  
# print(df)  
#   
# # 3、          :  
# df.iat[0,1]=0  
# print(df)  
#   
# # 4、     numpy        :  
# df.loc[:,'D']=np.array([5]*len(df))  
# print(df)  
#   
# # 5、   where        :  
# df2=df.copy()  
# df2[df2>0]=-df2  
# print(df2)  
#   
#   
#   
#   
#   
#   
#   
# #  、                   
# #  pandas ,  np.nan      ,              ,     :Missing Data Section。  
# #   
# # 1、  reindex()                /  /    ,             :、  
#   
# df1=df.reindex(index=dates[0:4],columns=list(df.columns)+['E'])  
# print(df1)  
#   
# # 2、           :  
# # df1.dropna(how='any',inplace=True)  
# # print(df1)  
#   
# # 3、          :  
# # df1=df1.fillna(value=5)  
# # print(df1)  
#   
# # 4、           :  
# # print(pd.isnull(df1))  
#   
#   
#   
#   
# #  、                  
# #       Basic Section On Binary Ops  
# #   
# # l    (               )  
# #   
# # 1、         :  
# print(df.mean())  
#   
# # 2、              :  
# print(df.mean(1))  
#   
# # 3、          ,           。Pandas               :  
# s=pd.Series([1,3,5,np.nan,6,8],index=dates).shift(2)  
# print(s)  
#   
#   
# # l  Apply  
# #   
# # 1、         :  
# print(df.apply(np.cumsum))  
# print(df.apply(lambda x:x.max()-x.min()))  
#   
# # l       
#   
# #      :Histogramming and Discretization  
#   
# s=pd.Series(np.random.randint(0,7,size=10))  
# print(s)  
#   
# print(s.value_counts())  
#   
# # l         
# #   
# # Series    str               ,                   
# s=pd.Series(['A','B','C','Bcaa',np.nan,'CBA','dog','cat'])  
# print(s.str.lower())  




#  、                
# Pandas              Series,DataFrame Panel                   。     :Merging section  
#   
# l  Concat  

# df=pd.DataFrame(np.random.randn(10,4))  
# # print(df)  
#   
# pieces=[df[:3],df[3:7],df[7:]]  
# print(pd.concat(pieces))  

# l  Join    SQL       

# left=pd.DataFrame({'key':['foo','foo'],'lval':[1,2]})  
# right=pd.DataFrame({'key':['foo','foo'],'rval':[4,5]})  
#   
# print(left)  
# print(right)  
#   
# mid=pd.merge(left,right,on='key')  
# print(mid)  

# l  Append         DataFrame   
# df=pd.DataFrame(np.random.randn(8,4),columns=['A','B','C','D'])  
# print(df)  
# s=df.iloc[3]  
# print(s)  
# df=df.append(s,ignore_index=True)  
# print(df)  




#  、                
#   ”group by”  ,                 :  
#   
# l  (Splitting)               ;  
#   
# l  (Applying)              ;  
#   
# l  (Combining)             ;  

# df=pd.DataFrame({'A':['foo','bar','foo','bar','foo','bar','foo','bar']  
#                  ,'B':['one','two','two','one','one','two','one','two']  
#                  ,'C':np.random.randn(8),'D':np.random.randn(8)})  
# print(df)  
#   
# # 1、            sum  :  
# print(df.groupby('A').sum())  
#   
# # 2、                   ,      :  
# print(df.groupby(['A','B']).sum())  

#  、            Reshaping  
# l  Stack  
# tuples=list(zip(*[['bar','bar','baz','baz','foo','foo','qux','qux']  
#                   ,['one','two','one','two','one','two','one','two']]))  
#   
# index=pd.MultiIndex.from_tuples(tuples, names=['first','second'])  
# df=pd.DataFrame(np.random.randn(8,2),index=index,columns=['A','B'])  
# df2=df[:4]  
# # print(df2)  
# print(df2.stack().unstack(1))  






#  、                  
# Pandas                 、        (             5            )  
# rng=pd.date_range('1/1/2012',periods=100,freq='S')  
# print(rng)  
# ts=pd.Series(np.random.randint(0,500,len(rng)),index=rng)  
# print(ts)  
# print(ts.resample('5Min',how='sum'))  

# 1、      :  
# rng=pd.date_range('3/6/2012 00:00',periods=5,freq='D')  
# print(rng)  
# ts=pd.Series(np.random.randn(len(rng)),index=rng)  
# print(ts)  
# ts_utc=ts.tz_localize('UTC')  
# print(ts_utc)  
#   
# # 2、      :  
# print(ts_utc.tz_convert('US/Eastern'))  
#   
# # 3、        :  
# rng=pd.date_range('1/1/2012',periods=5,freq='M')  
# print(rng)  
# ts=pd.Series(np.random.randn(len(rng)),index=rng)  
# print(ts)  
# ps=ts.to_period()  
# print(ps)  
# print(ps.to_timestamp())  

# 4、                            。  
# prng=pd.period_range('1990Q1','2000Q4',freq='Q-NOV')  
# print(prng)  
# ts=pd.Series(np.random.randn(len(prng)),index=prng)  
# print(ts)  
# ts.index=(prng.asfreq('M','e')+1).asfreq('H', 's')+8  
# print(ts.head())  







#  、            Categorical  
#  0.15    ,pandas   DataFrame   Categorical       

# df=pd.DataFrame({'id':[1,2,3,4,5,6],'raw_grade':['a','b','b','a','a','e']})  
# print(df)  
#   
# # 1、      grade   Categorical    :  
# df['grade']=df['raw_grade'].astype('category')  
# print(df)  
#   
# # 2、   Categorical               :  
# df['grade'].cat.categories=['very good','good','very bad']  
# print(df)  
#   
# # 3、           ,       :  
# df['grade']=df['grade'].cat.set_categories(['very bad','bad','medium','good','very good'])  
# print(df['grade'])  
#   
# # 4、       Categorical                 :  
# print(df.sort('grade'))  
#   
# # 5、   Categorical            :  
# print(df.groupby('grade').size())  





#   、               

# ts=pd.Series(np.random.randn(1000),index=pd.date_range('1/1/2012',periods=1000,freq='D'))  
# ts=ts.cumsum()  
# ts.plot()  
#   
# df=pd.DataFrame(np.random.randn(1000,4),index=ts.index,columns=['A','B','C','D'])  
# df=df.cumsum()  
# plt.figure();df.plot();plt.legend(loc='best')  
#   
#   
# #   、                    
# # 1、    csv  :  
# df.to_csv('foo.csv',index=False)  
#   
# # 2、   csv     :  
# pd.read_csv('foo.csv')  
#   
# # 1、    excel  :  
# df.to_excel('foo.xlsx',sheet_name='Sheet1')  
#   
# # 2、   excel     :  
# pd.read_excel('foo.xlsx','Sheet1',index_col=None,na_values=['NA'])  

좋은 웹페이지 즐겨찾기