Slicing yana cire wani ɓangare na jerin (listi, tuple, karin) ta amfani da syntax sequence[start:stop:step]. Ita kakariniyar iko, ƙaƙƙarfar gajiya ce da ake amfani da ita akai-akai a Python.
nums = [, , , , , ]
nums[:]
nums[:]
nums[:]
nums[:]
Ka'idar babbar: start shine haɗa, stop shine a waje (nums[1:4] yana ba da fihirisa 1, 2, 3 — ba 4 ba).
nums[-1] # 5 — last element
nums[-2] # 4 — second to last
nums[-3:] # [3, 4, 5] — last three elements
nums[:-1] # [0, 1, 2, 3, 4] — everything except the last
nums[::2] # [0, 2, 4] — every 2nd element
nums[1::2] # [1, 3, 5] — every 2nd, starting at index 1
nums[::-1] # [5, 4, 3, 2, 1, 0] — REVERSE the sequence (a famous idiom)
nums[::-1] juya jeri ɗaya daga sanannun idioms na Python.
s = "Hello"
s[1:4] # "ell"
s[::-1] # "olleH" — reverse a string
s[0] # "H"
nums = [0, 1, 2, 3, 4]
nums[1:3] = [10, 20, 30] # replace a slice (can change length)
# nums → [0, 10, 20, 30, 3, 4]
nums[10:20] # [] — out-of-range slices return empty, don't crash (unlike nums[10])
Ba kamar ƙaiton-ɗaya (wanda ke jefa IndexError), slicing yana bugi komawa abin da ake samu.
Slicing kakariniyar da aka samu a ko'ina, sautin Python ne don fitar, kwafi, da juyawa jeri a kyakkyafa.
Sanin syntax start:stop:step (musamman inclusive-start/exclusive-stop), fihirisa marasa kyau (lissafin daga ƙarshe), idiom juyawa ([::-1]), da cewa slices ya amince (babu rufin kan waje-da-waje) yana ba ka iko don sarrafa jeri da karin kayan gajiya da daidai.
Yana maye gurbin mahimmin mahimmin loops don yaɗi aiki da wannan bayani ne a cikin Python idiomatic.