Need help is specific Crosstab! Python Pandas -


this link close query have in mind. python pandas groupby aggregate on multiple columns

main topics covering question are: 1. python | 2. pandas ds | 3. group | 4. aggregate function | 5.efficiency

current pandas ds have column names -> unique_identifier | classification | products | values

so data has identifier repeating each product. need information 1 row each identifier , columns count(records) sum(values) each identifier - classification combination.

i did try groupby(['unique_identifier','classficiation']) couldn't figure out new column generation part size , sum.

also since data crazy big, looking high level of efficiency. novice in pandas , love gurus. thanks, m

sample data looks this:

index   identifier  classification  product value   1          123          x          abc    10   2          123          x          bcd    20   3          123          y          cde    30   4          123          y          def    40   5          123          z          efg    50   6          234          z          ghi    60   7          234          z          abc    70   8          234          x          bcd    80   9          345          x          cde    90   10         345          y          def    10

expected output - 

                 sum          size   identifier  x   y   z    x   y   z      123     30  70   50   2   2   1      234     80  nan 130   1  nan  2      345     90  10  nan   1   1  nan

i figured out few steps me view needed. gurus can cross-check , verify same. step1: setup groups using groupby(['identifier','classification'])

step2: aggregate function sum , count using 'values' temp['values'].agg(['sum','size']).reset_index()

/* reset index used see better ordered records rather referring older index */

step3 (optional): if have column (lets values2) u need repeat step 2 column , merge 2 datasets on identifier , classification

step4: use pivot(index='identifier',columns='classification')

step5: save dataset in required format. used csv.

output looks this--

                 sum          size   identifier  x   y   z    x   y   z      123     30  70   50   2   2   1      234     80  nan 130   1  nan  2      345     90  10  nan   1   1  nan

Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more