[Python] How can I create a full path to a file from parts (e.g. path to the folder, name and...

I need to pass a file path name to a module. How do I build the file path from a directory name, base filename, and a file format string?

The directory may or may not exist at the time of call.

For example:

dir_name='/home/me/dev/my_reports'
base_filename='daily_report'
format = 'pdf'


I need to create a string '/home/me/dev/my_reports/daily_report.pdf'

Concatenating the pieces manually doesn't seem to be a good way. I tried os.path.join:

join(dir_name,base_filename,format)


but it gives

/home/me/dev/my_reports/daily_report/pdf

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