04_python_functions.py

# List comprehension

def list_comprehension(tuple_list):
    """
    Takes a list of tuples and isolates all points that are within [0.2,0.4]
    for the first dimension and between [0.4,0.6] for the second dimension
    using a list comprehension.
    """
    filtered_list = [_ for _ in tuple_list if (_[0] >= 0.2) and (_[1] >= 0.4) and (_[0] <= 0.4) and (_[1] <= 0.6)]
    return filtered_list

print('List comprehension:\t', end='')
%timeit list_comprehension(python_list)


# Filter method

def filter_fctn(_):
    """
    Takes a tuple and returns True if the first value is within [0.2,0.4]
    while the second value is between [0.4,0.6].
    """
    return (_[0] >= 0.2) and (_[1] >= 0.4) and (_[0] <= 0.4) and (_[1] <= 0.6)

print('Filter:\t\t\t', end='')
%timeit list(filter(filter_fctn, python_list))


def map_fctn(_):
    """
    Takes a tuple and returns it if the first value is within [0.2,0.4]
    while the second value is between [0.4,0.6].
    """
    if (_[0] >= 0.2) and (_[1] >= 0.4) and (_[0] <= 0.4) and (_[1] <= 0.6):
        return _

print('Map:\t\t\t', end='')
%timeit list(filter(map_fctn, python_list))