Perform conditional filtering based on grouped column value in Pandas Python -


i want perform filtering on sales column such make-auction group there should atleast 1 sales >= 100. acura, copart has 101 sales both rows acura expected in output. bmw, sales <100 both copart , iaa, filtered out.

dataframe:

make    auction sales    acura   copart  101 acura   iaa     88   bmw     copart  50   bmw     iaa     60 buick   copart  130  buick   iaa     140

expected output:

make    auction sales    acura   copart  101 acura   iaa         88   buick   copart  130  buick   iaa     140

i able apply filter of >100 on entire sales column, not wanted. suggestion on how perform this? thanks!

use filtration:

df = df.groupby('make').filter(lambda x: x['sales'].ge(100).any()) print (df)     make auction  sales 0  acura  copart    101 1  acura     iaa     88 4  buick  copart    130 5  buick     iaa    140

another solution loc , boolean indexing make values filtered isin:

print (df.loc[df['sales'] >= 100, 'make']) 0    acura 4    buick 5    buick name: make, dtype: object  print (df['make'].isin(df.loc[df['sales'] >= 100, 'make'])) 0     true 1     true 2    false 3    false 4     true 5     true name: make, dtype: bool  df = df[df['make'].isin(df.loc[df['sales'] >= 100, 'make'])] print (df)     make auction  sales 0  acura  copart    101 1  acura     iaa     88 4  buick  copart    130 5  buick     iaa    140

second solution faster:

np.random.seed(123) n = 1000000 l = list('abcdefghijklmno') df = pd.dataframe({'make': np.random.choice(l, n),                    'sales':np.random.randint(110, size=n)}) print (df)  in [59]: %timeit df[df['make'].isin(df.loc[df['sales'] >= 100, 'make'])] 10 loops, best of 3: 55.6 ms per loop  #alexander answer in [60]: %timeit df[df['make'].isin(df[df['sales'] >= 100]['make'].unique())] 10 loops, best of 3: 65 ms per loop  in [61]: %timeit df.groupby('make').filter(lambda x: x['sales'].ge(100).any()) 1 loop, best of 3: 217 ms per loop  #pirsquared solution 1 in [62]: %timeit df[df.sales.ge(100).groupby([df.make]).transform('any')] 1 loop, best of 3: 135 ms per loop  #pirsquared solution 2 in [63]: %%timeit     ...: f, u = pd.factorize(df.make.values)     ...: w = df.sales.values >= 100     ...: df[(np.bincount(f, w) > 0)[f]]     ...:  10 loops, best of 3: 67.2 ms per loop

Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more