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Globbing  The archetypal use of wildcards is for matching
against the files in a directory, and making a list of all the
matches. This is called globbing.  You could do this using
fnmatch, by reading the directory entries one by one and testing
each one with fnmatch. But that would be slow (and complex,
since you would have to handle subdirectories by hand).  The
library provides a function glob to make this particular use of
wildcards convenient. glob and the other symbols in this section
are declared in glob.h.