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DAtAFrAmE sEt inDEx

一创建DataFrame的简单操作: 1.根据字典创造: In [1]: import pandas as pd In [3]: aa={'one':[1,2,3],'two':[2,3,4],'three':[3,4,5]} In [4]: bb=pd.DataFrame(aa) In [5]: bb Out[5]: one three two 0 1 3 2 1 2 4 3 2 3 5 4`123456789123...

首先是引入pandas和numpy,这是经常配合使用的两个包,pandas依赖于numpy,引入以后我们可以直接使用np/pd来表示这个两个模块先创建一个时间索引,所谓的索引(index)就是每一行数据的id,可以标识每一行的唯一值为了快速入门,我们看一下如何创...

df_new = df.set_index('new_index_col')

一创建DataFrame的简单操作: 1.根据字典创造: In [1]: import pandas as pd In [3]: aa={'one':[1,2,3],'two':[2,3,4],'three':[3,4,5]} In [4]: bb=pd.DataFrame(aa) In [5]: bb Out[5]: one three two 0 1 3 2 1 2 4 3 2 3 5 4`123456789123...

如何建立多重索引 import pandas as PDdf = PD.DataFrame()df['a'] = list(range(10,30,2))df['b'] = df['a'] // 10df.index.name = 'id'#drop : boolean, default True Delete columns to be used as the new indexdf = df.set_index([df['b'],...

import json import pandas as pd db = json.loads(open('pruItems.json', 'r').read()) pieces = [] for d in db: if d['data']: df = pd.DataFrame(d['data']) df.columns = ['date', 'bid', 'ask'] df = df.set_index('date') pieces.appe...

import json import pandas as pd db = json.loads(open('pruItems.json', 'r').read()) pieces = [] for d in db: if d['data']: df = pd.DataFrame(d['data']) df.columns = ['date', 'bid', 'ask'] df = df.set_index('date') pieces.appe...

import json import pandas as pd db = json.loads(open('pruItems.json', 'r').read()) pieces = [] for d in db: if d['data']: df = pd.DataFrame(d['data']) df.columns = ['date', 'bid', 'ask'] df = df.set_index('date') pieces.append(...

转换方法: import json import pandas as pd db = json.loads(open('pruItems.json', 'r').read()) pieces = [] for d in db: if d['data']: df = pd.DataFrame(d['data']) df.columns = ['date', 'bid', 'ask'] df = df.set_index('date') pie...

import json import pandas as pd db = json.loads(open('pruItems.json', 'r').read()) pieces = [] for d in db: if d['data']: df = pd.DataFrame(d['data']) df.columns = ['date', 'bid', 'ask'] df = df.set_index('date') pieces.appe...

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