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### 4.6 Tasks

The STILTS tasks documented in Appendix B can be used under their usual names if they are imported from the `stilts` module. STILTS parameters as are supplied as named arguments of the python functions. In general they are either table objects for table input parameters or strings, but in some cases python arrays are accepted, and numbers may be used where appropriate. The STILTS input format (`ifmt`, `istream`), filter (`cmd`/`icmd`/`ocmd`) and output mode (`omode`) parameters are not used however; instead perform filtering directly on the table inputs and outputs using the python `cmd_*` and `mode_*` table methods or functions.

Here is an example of concatenating two similar tables together and writing the result:

       >>> from stilts import tread, tcat
       >>> t1 = tread('data1.csv', fmt='csv')
       >>> t2 = tread('data2.csv', fmt='csv')
       >>> t12 = tcat([t1,t2], seqcol='seq')
       >>> t12.write('t12.csv', fmt='csv')

Note that for those tasks which have a parameter named "`in`" in command-line STILTS, it has been renamed as "`in_`" for the python version, to avoid a name clash with the python reserved word. In most cases, the `in` parameter is the first, mandatory parameter in any case, and so can be referenced by position as in the previous example (we could have written "`tcat(in_=[t1,t2])`" instead).

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STILTS - Starlink Tables Infrastructure Library Tool Set
Starlink User Note256
STILTS web page: http://www.starlink.ac.uk/stilts/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk