wgrk.net
相关文档
当前位置:首页 >> DAtAFrAmE sEt inDEx >>

DAtAFrAmE sEt inDEx

在dataframe中根据一定的条件,得到符合要求的某行元素所在的位置。 代码如下所示: [python] view plain copy df = pd.DataFrame({'BoolCol': [1, 2, 3, 3, 4],'attr': [22, 33, 22, 44, 66]}, index=[10,20,30,40,50]) print(df) a = df[(df.B...

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'],...

df_new = df.set_index('new_index_col')

a=pd.read('****') #load csvb=pd.DataFrame(a)b['time_interval']=pd.to_datetime(b['xxx'])-pd.to_datetime(b['xxx'])

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...

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...

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(...

DataFrame有一个属性为empty,直接用DataFrame.empty判断就行。 例如,你的DataFrame为test_df,有 如果test_df为空,则 test_df.empty 返回 True,反之 返回False。 注意empty后面不要加()。 学习tips:查好你自己所用的Pandas对应的版本,在官...

网站首页 | 网站地图
All rights reserved Powered by www.wgrk.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com