Apa struktur data utama di Python?
Berlatih Pertanyaan Wawancara Coding di Python
Kirill Smirnov
Data Science Consultant, Altran
Struktur data
Struktur data - format khusus untuk mengatur dan menyimpan data.
Struktur data utama di Python:
- list
- tuple
- set
- dictionary
List
list - urutan item yang terurut dan dapat diubah (mis. angka, string, dll.)
my_list = [1, 2, 3, 4, 5]
print(my_list)
[1, 2, 3, 4, 5]
List: mengakses item
my_list = [1, 2, 3, 4, 5]
print(my_list[2])
3
print(my_list[-1])
5
print(my_list[1:4])
[2, 3, 4]
print(my_list[2:])
[3, 4, 5]
List: mengubah item
my_list = [1, 2, 3, 4, 5]
my_list[2] = 30
print(my_list)
[1, 2, 30, 4, 5]
my_list[:2] = [10, 20]
print(my_list)
[10, 20, 30, 4, 5]
List: metode
my_list = [10, 20, 30, 40, 50]
my_list.append(60)
print(my_list)
[10, 20, 30, 40, 50, 60]
my_list.remove(60)
print(my_list)
[10, 20, 30, 40, 50]
List: metode
my_list = [10, 20, 30, 40, 50]
my_list.pop()
50
print(my_list)
[10, 20, 30, 40]
my_list.count(40)
1
Tuple
tuple - urutan item yang terurut dan tidak dapat diubah (mis. angka, string, dll.)
my_tuple = (1, 'apple', 2, 'banana')
print(my_tuple)
(1, 'apple', 2, 'banana')
my_tuple = 1, 'apple', 2, 'banana'
print(my_tuple)
(1, 'apple', 2, 'banana')
Tuple: mengubah nilai
Mengubah item dalam tuple tidak memungkinkan.
my_tuple[0] = 10
TypeError
Set
set - koleksi tidak terurut tanpa duplikat (mis. angka, string, dll.)
my_set = set([1, 2, 3, 4, 5])
print(my_set)
{1, 2, 3, 4, 5}
my_set = set([1, 1, 1, 2, 3, 4, 5, 5, 5])
print(my_set)
{1, 2, 3, 4, 5}
Set: metode
my_set1 = set([1, 2, 3, 4, 5])
my_set2 = set([3, 4, 5, 6, 7])
my_set1.add(6)
print(my_set1)
{1, 2, 3, 4, 5, 6}
my_set1.remove(6)
print(my_set1)
{1, 2, 3, 4, 5}
my_set1.union(my_set2)
{1, 2, 3, 4, 5, 6, 7}
my_set1.intersection(my_set2)
{3, 4, 5}
my_set1.difference(my_set2)
{1, 2}
Dictionary
dictionary - koleksi pasangan key-value dengan key unik dan tidak dapat diubah
$\text{key} \rightarrow \text{value}$
fruits = {'apple': 10, 'orange': 6, 'banana': 9}
print(fruits)
{'apple': 10, 'banana': 9, 'orange': 6}
fruits = dict([('apple', 10), ('orange', 6), ('banana', 9)])
print(fruits)
{'apple': 10, 'banana': 9, 'orange': 6}
Dictionary: mengakses nilai
Mengakses nilai untuk sebuah key:
fruits = {'apple': 10, 'orange': 6, 'banana': 9}
fruits['apple']
10
fruits['grapefruit']
KeyError: 'grapefruit'
Dictionary: mengubah nilai
fruits['apple'] = 20
print(fruits)
{'apple': 20, 'orange': 6, 'banana': 9}
fruits['grapefruit'] = 11
print(fruits)
{'apple': 20, 'orange': 6, 'banana': 9, 'grapefruit': 11}
Dictionary: metode
fruits = {'apple': 10, 'orange': 6, 'banana': 9}
fruits.items()
dict_items([('apple', 10), ('orange', 6), ('banana', 9)])
Dictionary: metode
fruits = {'apple': 10, 'orange': 6, 'banana': 9}
list(fruits.items())
[('apple', 10), ('orange', 6), ('banana', 9)]
Dictionary: metode
fruits = {'apple': 10, 'orange': 6, 'banana': 9}
fruits.keys()
dict_keys(['apple', 'orange', 'banana'])
fruits.values()
dict_values([10, 6, 9])
Dictionary: metode
fruits = {'apple': 10, 'orange': 6, 'banana': 9}
list(fruits.keys())
['apple', 'orange', 'banana']
list(fruits.values())
[10, 6, 9]
Dictionary: metode
fruits = {'apple': 10, 'orange': 6, 'banana': 9}
fruits.popitem()
9
print(fruits)
{'apple': 10, 'orange': 6}
Operasi pada List, Tuple, Set, dan Dictionary
my_list = [1, 2, 3, 4, 5]
len(my_list)
5
my_tuple = (1, 2, 3, 4, 5)
len(my_tuple)
5
my_set = set([1, 2, 3, 4])
len(my_set)
4
my_dict = {'a': 1, 'b': 2, 'c': 3}
len(my_dict)
3
Operasi pada List, Tuple, Set, dan Dictionary
my_list = [1, 2, 3, 4, 5]
2 in my_list
True
my_tuple = (1, 2, 3, 4, 5)
2 in my_tuple
True
my_set = set([1, 2, 3, 4])
5 in my_set
False
my_dict = {'a': 1, 'b': 2, 'c': 3}
'b' in my_dict
True
Ayo berlatih!
Berlatih Pertanyaan Wawancara Coding di Python
