python 3.x - Cell wise operation on data frame, determine precision -


i have data frame different data types in it. determine precision of float types. can select float64 code:

df_float64 = df.loc[:, df.dtypes == np.float64]

(not sure why columns 'nan' values selected side note)

now determine precision thing abut such approach:

precision = len(cell.split(".")[1]

if cell string.

and have output in form of csv maximum precision each column.

so having data frame this:

|     a|     b|     c|     d| |  0.01|0.0923|   1.0|   1.2| | 100.1| 203.3| 1.093|   1.9| |   0.0|  0.23|  1.03|   1.0|

i to have this:

|     a|     b|     c|     d| |     2|     4|     3|     1|

is possible using pandas?

thanks

you can use:

  • fillna first remove nans
  • cast str astype
  • loop columns apply or list comprehension lambda function
  • for each column split, second values of list str[1] , len
  • get max values - output series
  • convert series 1 row dataframe if necessery
a = df.fillna(0).astype(str).apply(lambda x: x.str.split('.').str[1].str.len()).max() print (a)    2 b    4 c    3 d    1 dtype: int64  df = a.to_frame().t print (df)     b  c  d 0  2  4  3  1

another solution:

df = df.fillna(0).astype(str) = [df[x].str.split('.').str[1].str.len().max() x in df]  df = pd.dataframe([a], columns=df.columns) print (df)     b  c  d 0  2  4  3  1

Comments

Post a Comment

Popular posts from this blog

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

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

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more