concat

I have three pandas df one of them has been 'row'-shifted and the first element is empty. When I concatenate the three df to obtain a single 3-column dataframe I get all NaN in two out of three columns: df1: S 2010-12-31 True 2011-01-01 False 2011-01-02 False df2: P 2010-12-31 2011-01-01 On 2011-01-02 On df3: C 2010-12-31 On 2011-01-01 On 2011-01-02 On res = pd.concat([df1, df2, df3]): P C S 2010-12-31 NaN NaN True 2011-01-01 NaN NaN False 2011-01-02 NaN NaN False The order seems to be inverted as well... Many thanks In [2]: index = pd.DatetimeIndex(['2010-12-31', '2011-01-01', '2011-01-02'])

I have two pandas.DataFrames which I would like to combine into one. The dataframes have the same number of columns, in the same order, but have column headings in different languages. How can I efficiently combine these dataframes? df_ger index Datum Zahl1 Zahl2 0 1-1-17 1 2 1 2-1-17 3 4 df_uk index Date No1 No2 0 1-1-17 5 6 1 2-1-17 7 8 desired output index Datum Zahl1 Zahl2 0 1-1-17 1 2 1 2-1-17 3 4 2 1-1-17 5 6 3 2-1-17 7 8 The only approach I came up with so far is to rename the column headings and then use pd.concat([df_ger, df_uk], axis=0, ignore_index=True) . However, I hope to find a

function whatTheHeck(obj){ var arr = [] for(o in obj){ arr.concat(["what"]) } return arr } whatTheHeck({"one":1, "two": 2}) The concat function completely fails to do anything. But if I put a breakpoint on that line in Firebug and run the line as a watch it works fine. And the for loop iterates twice but in the end arr still equals []. Array.concat creates a new array - it does not modify the original so your current code is actually doing nothing. It does not modify arr . So, you need to change your function to this to see it actually work: function whatTheHeck(obj){ var arr = []; for(o in

This question already has an answer here : How to concatenate Strings in EL expression? (1 answer) I have the following el expression: <af:outputText value="#{viewArticle.publish ? ('Publish on ' + viewArticle.publishDate + ' by ' + viewArticle.publishFirstName + ' ' + viewArticle.publishLastName) : 'Draft version'}"/> But I am getting java.lang.NumberFormatException: For input string: "Publish on " How can I join the string? Marcio Aguiar You can use the String.concat function: <af:outputText value="#{viewArticle.publish ? 'Publish on '.concat(viewArticle.publishDate).concat(' by ').concat

So my google-fu doesn't seem to be doing me justice with what seems like should be a trivial procedure. In Pandas for Python I have 2 datasets, I want to merge them. This works fine using .concat. The issue is, .concat reorders my columns. From a data retrieval point of view, this is trivial. From a "I just want to open the file and quickly see the most important column" point of view, this is annoying. File1.csv Name Username Alias1 Tom Tomfoolery TJZ Meryl MsMeryl Mer Timmy Midsize Yoda File2.csv Name Username Alias 1 Alias 2 Bob Firedbob Fire Gingy Tom Tomfoolery TJZ Awww Result.csv Alias1