How to let Pool.map take a lambda function

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Use a function object:

class Copier(object):
    def __init__(self, tgtdir):
        self.target_dir = tgtdir
    def __call__(self, src):
        copy_file(src, self.target_dir)

To run your Pool.map:

p.map(Copier(target_dir), file_list)

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