python - How to merge two columns together in Pandas -

-

i have data:

1975,a,b 1976,b,c 1977,b,a 1977,a,b 1978,c,d 1979,e,f 1980,a,f

i want have two-column list of years , items, so:

1975,a 1975,b ...

i have code:

import pandas  # set column names colnames=['date','item1','item2']  # read csv adding column names data = pandas.read_csv('/users/simon/dropbox/work/datasets/lagtest.csv', names=colnames)  # create dataframe info on dates first column datelist1 = data[['date', 'item1']]  # create dataframe info on dates first column datelist2 = data[['date', 'item2']]  bigdatelist = datelist1.append(datelist2)  print bigdatelist

but gives me this:

   date item1 item2 0  1975       nan 1  1976     b   nan 2  1977     b   nan 3  1977       nan 4  1978     c   nan 5  1979     e   nan 6  1980       nan 0  1975   nan     b 1  1976   nan     c 2  1977   nan     3  1977   nan     b 4  1978   nan     d 5  1979   nan     f 6  1980   nan     f

i want line numbering continuous , 2 last columns merged one. suggestions?

you looking pd.melt.

suppose have dataframe

>>> df    date item1 item2 0  1975         b 1  1976     b     c 2  1977     b     3  1977         b 4  1978     c     d 5  1979     e     f 6  1980         f  [7 rows x 3 columns]

now use this:

pd.melt(df, id_vars='year')['year','value']

to need.

>>> pd.melt(df, id_vars='date')[['date','value']]     date value 0   1975     1   1976     b 2   1977     b 3   1977     4   1978     c 5   1979     e 6   1980     7   1975     b 8   1976     c 9   1977     10  1977     b 11  1978     d 12  1979     f 13  1980     f  [14 rows x 2 columns]

Comments

Post a Comment

Popular posts from this blog

C# random value from dictionary and tuple -

-
i have following code, , need random item contains string "region_1" dictionary. public static dictionary<int, tuple<string, int, currencytype>> itemarray = new dictionary<int, tuple<string, int, currencytype>>() { { 0xb3e, new tuple<string, int, currencytype>("region_1", 1500, currencytype.fame) } }; public static int generateitemid(string shopid) { var generateditem = itemarray.elementat(new random().next(0, itemarray.count)).key; } how select this? it's not possible efficiently... first create static random @ class level... prevent non-random behaviour if run query on short period of time... (it's seeded discrete clock) static random rnd = new random(); then: var item = itemarray.values .where(t => t.item1 == shopid) .orderby(_ => rnd.next()) .firstordefault()
Read more

cgi - How do I interpret URLs without extension as files rather than missing directories in nginx? -

-
so i'm trying install zoneminder , have run under nginx, has few compiled files need run using fast-cgi. these files lack extension. if file has extension, there no issue , nginx interprets file , return 404 if can't find it. if has no extension, assume it's directory , return 404 when can't find sort of index page. here have now: # security camera domain. server { listen 888; server_name mydomain.com; root /srv/http/zm; # enable php support. include php.conf; location / { index index.html index.htm index.php; } # enable cgi support. location ~ ^/cgi-bin/(.+)$ { alias /srv/cgi-bin/zm/; fastcgi_pass unix:/run/fcgiwrap.sock; fastcgi_param script_filename $document_root/$1; include fastcgi.conf; } } the idea is, under cgi-bin directory goes through fastcgi pipe. any idea on howi can fix this? upon closer inspection, realized zoneminder has 2 cgi sc...
Read more

.htaccess - htaccess convert request to clean url and add slash at the end of the url -

-
ok , searched more 4 days , more 20 posts here in stach or in websites without kind of success first here htaccess file rewriteengine on rewriterule ^([a-za-z0-9_]+)/?$ index.php?page=$1 [nc] rewriterule ^([a-za-z0-9_]+)\/([a-za-z0-9_]+)\/?$ index.php?page=$1&action=$2 [nc] i tried many codes 1 worked me can call request , works me www.example.com/pagename => www.example.com/index.php?page=pagename here questions , please provide me information "in detail" understand code well 1- how convert request automatically www.example.com/index.php?page=pagename www.example.com/pagename 2- if tried add slash @ end shows me page without images or styling mean www.example.com/pagename => works www.example.com/pagename/ => doesn't work that's :) for first part need 301 rule this: rewritecond %{the_request} /index\.php\?page=([^\s&]+) [nc] rewriterule ^ /%1? [r=301,l] for second part use absolute path in css, js, images files r...
Read more