python - reading and writing csv with DictWriter -


is possible read , write existing csv dictwriter. if not, there package available following:

csv:

event_type, flight_number, test_result 'eta', '1234',''

script:

testdata = csv.dictreader(open('test_data.csv', 'ru'))  row in testdata:      eventtype = row['event_type'].strip()     flightnumber = row['flight_number'].strip()     result = 6     row['test_result'] = result

after calculation want write current row of 'test_result' column value of result.

after tinkering method seems best until find better way.

import csv, os  testdata = csv.dictreader(open('test_data.csv', 'ru')) rowheaders = testdata.fieldnames resultfile = open('result_data.csv', 'w', newline='') csvwriter = csv.dictwriter(resultfile, rowheaders) csvwriter.writeheader() resultfile.close()  resultfile = open('result_data.csv', 'a', newline='') csvwriter = csv.dictwriter(resultfile, rowheaders)  row in testdata:      eventtype = row['event_type'].strip()     flightnumber = row['flight_number'].strip()     result = 7      csvwriter.writerow({'event_type': eventtype,                          'flight_number': flightnumber,                          'test_result': result})

its creating new file same exact data + additional data

output result_data.csv :

event_type, flight_number, test_result eta, 1234,7 etd, 1034,7

Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more