Python List (With Examples) - Tekhnologiyamechta
What is a list in python?
The list is a type of data structure in python. It is used for storing multiple elements in a square bracket. It stores any type of value like int, char, float. It is a collection that is ordered and changeable. Allows duplicate members.
Syntax of the list :
a = ["somay", "Tekhnologiyamechta", "2000"]
print(a)
Output -- ['somay', 'Tekhnologiyamechta', '2000']
How to access element in a list:
a = ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla"]
print(a[0]) ---------- somay
print(a[1]) ---------- Tekhnologiyamechta
print(a[2]) ---------- 2000
print(a[3]) ---------- 5.78
print(a[4]) ---------- mangla
Negative Indexing in python
a = ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla"]
print(a[-1]) ---------- mangla
print(a[-2]) ---------- 5.78
print(a[-3]) ---------- 2000
print(a[-4]) ---------- Tekhnologiyamechta
print(a[-5]) ---------- somay
How to slice list in python
a = ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla"]
# accessing element 0 to 3 position
print(a[0:3]) ---------- ["somay", "Tekhnologiyamechta", "2000"]
#accessing element -1 to -3
print(a[-1:-3]) ------------ [5.78,"mangla]
How to change the value from the given value in the list?
a = ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla"]
a[2]=chinu
print(a) ------------------ ["somay", "Tekhnologiyamechta", "chinu",5.78,"mangla"]
How to use append or extend in the list?
a = ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla"]
a.append(chinu)
print(a)----------------------------- ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla",chinu]
a = ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla"]
a.extend([4,5,6])
print(a)----------------------------- ["somay", "Tekhnologiyamechta", "2000",5.78,"mangla",4,5,6]
How to use Concatenating and repeating lists
odd = [1, 3, 5]
print(odd + [6, 8, 9]) --------------- [1,3,5,]
print(["somay"] * 3) ------------------ ["somay" ,"somay", "somay"] # Deleting list items
my_list1 = ['p', 'r', 'o', 'b', 'l', 'e', 'm']
# delete one item
del my_list1[2] ------------ ['p', 'r', 'b', 'l', 'e', 'm']
print(my_list1)
# delete multiple items
del my_list1[1:5] -------- ['p', 'm']
print(my_lis1t)
# delete entire list
del my_list1
# Error: List not defined
print(my_list1) Output --
Traceback (most recent call last):
File "<string>", line 18, in <module>
NameError: name 'my_list' is not defined # Python list methods
my_list1 = [3, 8, 1, 6, 0, 8, 4]
print(my_list1.index(8)) ----------------- 1
print(my_list1.count(8)) -------------------- 2
my_list1.sort() --------------------- [0, 1, 3, 4, 6, 8, 8]
my_list1.reverse()-------------------- [8, 8, 6, 4, 3, 1, 0] List comprehension in python pow = [2 ** x for x in range(5)]
print(pow) output --[1, 2, 4, 8, 16] list in python in hindi,
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