Add easy way to label progressbar from iterator wrapper helper function

[vaughnkoch]

I couldn't find a way to add a simple label to the progressbar, especially in the convenience function which greatly reduces code and thus makes it super easy to add a progressbar.

This is what the current default output is:

from progressbar import progressbar
for x in progressbar(range(100)):
    .. some code ..
# Outputs:
# 100% (100 of 100) |###################| Elapsed Time: 0:00:10 Time:  0:00:10

Is it possible to add something like this to add a default label?

for x progressbar(range(100), label='Foobar')
...
# Outputs:
# Foobar: 100% (100 of 100) |###################| Elapsed Time: 0:00:10 Time:  0:00:10

If this is already possible, please disregard - I looked and couldn't find a way to do this easily, including DynamicMessage.

My version: progressbar2==3.37.1, Python 3.6.4.
P.S. I love this module, thanks for creating it.

[wolph]

You can work around it by manually specifying the widgets, but that doesn't help much I suppose so I've created a new version that allows for an optional prefix/suffix

from progressbar import progressbar

for x in progressbar(range(100), prefix='Foobar: '):
    ...

[vaughnkoch]

Thanks!