python 3.x - Pandas: Join multiple data frame on the same keys -


i need join 5 data frames using same key. created several temporary data frame while doing join. code below works fine, wondering there more elegant way achieve goal? thanks! 

df1 = pd.read_pickle('df1.pkl') df2 = pd.read_pickle('df2.pkl') df3 = pd.read_pickle('df3.pkl') df4 = pd.read_pickle('df4.pkl') df5 = pd.read_pickle('df5.pkl')  tmp_1 = pd.merge(df1, df2,  how ='outer', on = ['id','week']) tmp_2 = pd.merge(tmp_1, df3,  how ='outer', on = ['id','week']) tmp_3 = pd.merge(tmp_2, df4,  how ='outer', on = ['id','week']) result_df = pd.merge(tmp_3, df5,  how ='outer', on = ['id','week'])

use pd.concat after setting index

dfs = [df1, df2, df3, df4, df5] cols = ['id', 'weedk'] df = pd.concat([d.set_index(cols) d in dfs], axis=1).reset_index()

include file reading

from glob import glob  def rp(f):     return pd.read_pickle(f).set_index(['id', 'week'])  df = pd.concat([rp(f) f in glob('df[1-5].pkl')], axis=1).reset_index()

Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more