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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def countfiles(path, recurse=False):
 """Returns the number of files under the given directory path."""

    if not op.isdir(path):
        return 0
    count = 0
    for r,ds,fs in os.walk(path):
        count += len(fs)
        if not recurse:
            break
    return count