Question

In python I have the following function:

def is_a_nice_element(element, parameter):
    #do something
    return True or False

Now I would like to filter a list with this function as predicate, giving a fixed parameter. Python has the itertools.ifilter function, but I can’t figure out how to pass the parameter. Is this possible? If not, how can I solve this problem?

Answer 1

Wrap it in a lambda:

itertools.ifilter(lambda e: is_a_nice_element(e, 42), iterable)

42 is your extra argument, or whatever else you want it to be.