Python - Ez hogy működhet?

Nincs mit.

Küldök pár példát, amiket én csináltam gyakorlásképpen. Ha kipróbálod, elemezgeted rájössz mire jó a comprehension.

## Task 5

first_five_squares = { x*x for x in {1,2,3,4,5} }

## Task 6

first_five_pows_two = { 2**x for x in {0,1,2,3,4} }

## Task 9

base = 10

digits = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

three_digits_set = {x*base**2+y*base+z for x in digits for y in digits for z in digits}

## Task 10

S = {1, 2, 3, 4}

T = {3, 4, 5, 6}

S_intersect_T = {x for x in S for y in T if x==y}

## Task 13

cartesian_product = [[x, y] for x in {'A','B','C'} for y in {1,2,3}] # use form: [ ... {'A','B','C'} ... {1,2,3} ... ]

## Task 14

S = {-4, -2, 1, 2, 5, 0}

zero_sum_list = [(i,j,k) for i in S for j in S for k in S if i+j+k==0]

## Task 15

exclude_zero_list = [(i,j,k) for i in S for j in S for k in S if i+j+k==0 if not(i==0 and j==0 and k==0)]

## Task 16

first_of_tuples_list = [(i,j,k) for i in S for j in S for k in S if i+j+k==0 if not(i==0 and j==0 and k==0)][0]

## Task 30

def list2dict(L, keylist): return { keylist[k]:L[k] for k in range(len(L)) }