What’s the best way to declare a DataFrame that updates itself inside a loop?

I am reading multiple CSV files and averaging them. Due to memory constraints, I can read only one at a time, so I have a routine for reading them on a loop that looks like this: first_iteration = True for path in paths: print(f’Reading path {path}’) sub = pd.read_csv(path) if first_iteration: first_iteration=False pred = sub[‘meter_reading’]/len(paths)…

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record single value from multidimensional array to table in yii2

I used yii2 framework and I tried to insert every single value from multidimensional array to record in every row BANDWIDTH_TODAY column. $data = Bandwidth::find()->select([‘SITE_ID’,’BANDWIDTH_TODAY’])->all(); $id = 0; foreach ($data as $value) { $value = $today_bandwidth[$id][‘BANDWIDTH_TODAY’]; $data->BANDWIDTH_TODAY = $value; $data->save(); $value->delete(); $id = $id+1; # code… } but it has error yii\base\ErrorException: Attempt to assign…

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