Build the full path filename in Python

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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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