Is it possible to write the value of a variable in the magic of the %% writefile command in an IPython notebook?

I want to be able to use a variable to output some text in an IPython Notebook. I can write a file from IPython Notebook using %% writefile command. I can also use a variable to name the file using $ varaible_name.

file_name = "file.out"
some_variable = "text"

      

        
        
        
      

    

New cell

%%writefile $file_name
????some_varaible  #<-what command goes here

      

        
        
        
      

    

So the output file (named "file.out") looks like this:

text