In my opinion the ": " which is automatically appended to the description string should be part of the format string, not of the description string. The reason is that the colon is only sensible in the front of the bar but you can move the description anywhere using the bar_format kwarg. Having a colon at any other position does not look nice.

Initially my motivation for this request was to display some additional variables, like set_postfix allows but with a custom format for numbers. So I tried using set_description for this which appends the ": ". The alternative that I currently use is to convert all dict entries to str with the respective format. Nevertheless I think it would be sensible to remove the mentioned characters from the description.

This was already mentioned in a comment on issue #343. Relevant line of code.

Additional remark: postfix is not mentioned in the bar_format docstring and in the github README as a variable for the format string.