robotframework - How to write a variable into a file? -

i store ${username} value in output file:

e.g. if ${username} equals 0401190926729000, value stored in file.

here proposal:

*** settings *** library  operatingsystem library  string  *** test cases *** write_variable_in_file   ${username} =  generate random string  1  abc   log console   ${username}   run keyword if  '${username}' == 'a'   write_variable_in_file  ${username}  *** keywords *** write_variable_in_file   [arguments]  ${variable}   create file  ${execdir}/file_with_variable.txt  ${variable}