List Bersarang dan Iterasi

Pendahuluan

Struktur Daftar Bersarang

matrix = [[1,2,3],[4,5,6],[7,8,9]]
print(matrix[1][2])

Mengiterasi Baris

matrix = [[1,2],[3,4]]
for row in matrix:
    print(row)

Perulangan for Bersarang

matrix = [[1,2],[3,4]]
for row in matrix:
    for val in row:
        print(val, end=' ')

Meratakan Daftar Bersarang

matrix = [[1,2],[3,4]]
flat = [x for row in matrix for x in row]
print(flat)

Membangun Kisi

grid = [[0]*3 for _ in range(3)]
grid[0][0] = 1
print(grid)

Jebakan Baris Beralias

bad = [[0]*3]*3
bad[0][0] = 9
print(bad)  # all rows changed!

zip() untuk Iterasi Paralel

names = ['Alice', 'Bob']
scores = [90, 85]
for n, s in zip(names, scores):
    print(n, s)

enumerate() dengan Daftar Bersarang

matrix = [[1,2],[3,4]]
for i, row in enumerate(matrix):
    for j, val in enumerate(row):
        print(f'[{i}][{j}]={val}')

Mengurutkan Daftar Berisi Daftar

data = [['Bob',85],['Alice',90],['Charlie',78]]
data.sort(key=lambda x: x[1])
print(data)

Mentransposisikan Matriks

matrix = [[1,2,3],[4,5,6]]
print(list(zip(*matrix)))

Pemeriksaan Cepat

Ringkasan

Lanjutkan