Python "comprehension" expressions

comprehensions.py

## Lists

result_list_1 = []
for x in xs:
    for y in ys:
        for z in zs:
            if condition(x, y, z):
                result_list_1.append((x, y, z))

result_list_2 = [
    (x, y, z)
    for x in xs
    for y in ys
    for z in zs
    if condition(x, y, z)
]


## Sets

result_set_1 = set()
for x in xs:
    for y in ys:
        for z in zs:
            if condition(x, y, z):
                result_set_1.add((x, y, z))

result_set_2 = {
    (x, y, z)
    for x in xs
    for y in ys
    for z in zs
    if condition(x, y, z)
}


## Dicts

result_dict_1 = {}
for x in xs:
    for y in ys:
        for z in zs:
            if condition(x, y, z):
                result_dict_1[(x, y, z)] = func(x, y, z)

result_dict_2 = {
    (x, y, z): func(x, y, z)
    for x in xs
    for y in ys
    for z in zs
    if condition(x, y, z)
}


## Generators

for make_gen_1():
    for x in xs:
        for y in ys:
            for z in zs:
                if condition(x, y, z):
                    yield (x, y, z)
result_gen_1 = make_gen_1()

result_gen_2 = (
    (x, y, z)
    for x in xs
    for y in ys
    for z in zs
    if condition(x, y, z)
)