Python in a Nutshell

Name

map

Synopsis

map(func,seq,*seqs)

Applies func to every item of seq and returns a list of the results. When map is called with n +1 arguments, the first one, func, can be any callable object that accepts n arguments, or None. The remaining arguments to map must be iterable. When func is callable, map repeatedly calls func with n arguments (one corresponding item from each iterable) and returns the list of results. Thus, map( func, seq ) is the same as:

[func(item) for item in seq]

When func is None, map returns a list of tuples, each with n items (one item from each iterable); this is similar to zip, covered in this section. When the iterable objects have different lengths, however, map conceptually pads the shorter ones with None, while zip conceptually truncates the longer ones.