python - pandas read frame and subsequent type manipulation issue -

-

hello rookie pandas , have particular behavior want know reason for

sqlnew = 'select fund_no,start_date,end_date,cash,bond,small_cap,large_cap,international odsact.act_src_fund_mapping;' actualfundmapping = psql.read_frame(sqlnew,cnxn)

'everyworks fine until above'

actualfundmapping.dtypes::  fund_no           object start_date        object end_date          object cash             float64 bond             float64 small_cap        float64 large_cap        float64 international    float64

'so since want stuff datetime.datetime(2013,1,1) in actualfundmapping['start_date'] try changing dtype below

actualfundmapping['start_date'] = pd.to_datetime(str(actualfundmapping['start_date'])) actualfundmapping['end_date'] = pd.to_datetime(str(actualfundmapping['end_date'])) actualfundmapping['fund_no'] = actualfundmapping['fund_no'].astype(np.int64)

'but existence tests come false

datetime.datetime(2012,1,1) in actualfundmapping['start_date'] false

"that entry exists in sql table , have verified it

where as

str(datetime.datetime(2012,1,1)) in str(actualfundmapping['start_date']) true

'the same issue repeats following

np.int64(1000) in actualfundmapping['fund_no'] false

i guess not understanding representation pandas use internally. appreciated.

*******update*******

upon further advice made start_date column of sql table index column of dataframe.

actualfundmapping = psql.read_frame(sqlnew,cnxn,'start_date')

actualfundmapping.index
[2012-01-01 00:00:00, ..., 2012-01-01 00:00:00]
length: 895, freq: none, timezone: none

datetime.datetime(2012,1,1) in actualfundmapping false

datetime.datetime(2012,1,1) in actualfundmapping.index

false

np.datetime64(datetime.datetime(2012,1,1)) in actualfundmapping.index

false

by doing str(actualfundmapping['start_date']), converting entire column single string. believe pandas stores strings dtype object (to avoid truncation issues arise when using numpy string dtypes). try using pd.to_datetime(actualfundmapping['start_date']). if raises error, there may mixed-type data in column, , have more detective work figure out individual values causing problems.

as unutbu suggests, need sure check membership in series values, not index.


Comments

Post a Comment

Popular posts from this blog

python - mat is not a numerical tuple : openCV error -

-
i have write down code showing error ma not getting it: please help: showing mat not numerical tuple: import cv import cv2 capture = cv2.videocapture("j.3gp") while(1): _, frame1 = capture.read() grayimage1 = cv2.cvtcolor(frame1, cv2.color_bgr2gray) _, frame2 = capture.read() grayimage2 = cv2.cvtcolor(frame2, cv2.color_bgr2gray) differenceimage = cv2.absdiff(grayimage1,grayimage2) thresholdimage = cv2.threshold(differenceimage,25,255,cv2.thresh_binary) cv2.imshow("difference image", differenceimage) cv2.imshow("threshold image", thresholdimage) cv2.imshow("image", frame1) k = cv2.waitkey(30) & 0xff error arising : ----------------------------------------------------------------------------------------- traceback (most recent call last): file "desk.py", line 15, in <module> cv2.imshow("threshold image", thresholdimage) typeerror: mat not numerical tuple ...
Read more

c# - MSAA finds controls UI Automation doesn't -

-
i'm working on automating windows application. i'm using teststack white framework. i've hit problem. program has 'window' object cannot see inside of. white shows no controls inside of it. inspect.exe shows no controls inside of either when running in ui automation mode. if switch inspect msaa see controls inside fine. there anyway me use msaa c# handle on these controls? if can identify msaa functions need, can use p/invoke call them c#. here's example article doing msaa: http://www.codeproject.com/articles/38906/ui-automation-using-microsoft-active-accessibility also, pinvoke.net can used identify iaccessible (msaa) functions: http://www.pinvoke.net/search.aspx?search=iaccessible&namespace=[all] here's answer along lines: msaa com-based? finally, alternative p/invoke, might able use tlbimp.exe create wrapper assembly oleacc.dll, , access msaa functions through it. i'm not sure if works msaa, it's worth try. as e...
Read more

wordpress - .htaccess: RewriteRule: bad flag delimiters -

-
pulling hair out on one. have following .htaccess file custom redirects in addition wordpress's default settings. when tested on local wamp server worked fine after moving production i'm not getting rewriterule: bad flag delimiters error in server log , after while site goes down internal server error any appreciated. in advance! <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^rockford_weddings___welcome\.html$ /wedding/ [r=301,l] rewriterule ^blog/?$ /journal/ [r=301,l] rewriterule ^blog/(.*)$ /$1 [r=301,l] rewriterule ^portraitinvestment/?$ /portraitinvestment\.pdf [r=301,l] rewriterule ^weddinginvestment/?$ /weddinginvestment\.pdf [r=301,l] rewriterule ^holidaycards2014/?$ /holidaycards2014\.pdf [r=301,l] </ifmodule> # begin wordpress <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^index\.php$ - [l] rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule . /index.php [l] </...
Read more