python list and tuples 4 | Learn With Pirates

Chapater 4: Python List And Tuples

List In Python

Python list is used to store a set of values of any data type.

a = [5,6,7,8,] # Create a list with []

Output

[5, 6, 7, 8]

List Indexing

a = [5,6,7,8,]

# Access using index using a[0], a[1],

print(a[3])

Output

8

the list is an index at 0 to the end of the list

h = [77, "PIrates", True, 7.7] # create with any Data Type

print(h)

Output

[77, 'PIrates', True, 7.7]

Slicing In list:

# slicing in list

word = ["Pirates", "Learn", 66, "like", "tom"]

print(word[0:3])

print(word[-3:])

Output

['Pirates', 'Learn', 66] [66, 'like', 'tom']

List Methods

l1 = [7, 8, 9, 10, 15, 16,]

print(l1)

l1.sort() # sorts the list

print(l1)

l1.reverse() # reverses the list

print(l1)

l1.append(45) # adds 45 at the end of the list

print(l1)

l1.insert(2, 199) # inserts 199 at index 2

print(l1)

l1.pop(2) # removes element at index 2

print(l1)

l1.remove(10) # removes 21 from the list

print(l1)

Output

[7, 8, 9, 10, 15, 16] [7, 8, 9, 10, 15, 16] [16, 15, 10, 9, 8, 7] [16, 15, 10, 9, 8, 7, 45] [16, 15, 199, 10, 9, 8, 7, 45] [16, 15, 10, 9, 8, 7, 45] [16, 15, 9, 8, 7, 45]

Tuples In Python

t = (1, 2, 4, 5) # Creating a tuple using ()

# How to create singal element tuple

t1 = () # Empty tuple

t1 = (7) # Wrong way to declare a Tuple with Single element

t1 = (7,) # Tuple with Single element

print(t1)

print(t[3]) # indexing tuple

output

5

tuples is an immutable data type in python.

t = (1, 2, 4, 5)

t[0] =55

print(t)

Output

TypeError: 'tuple' object does not support item assignment

Note: Once you define tuples that can not be altered or manipulated  

Tuples methods

# consider this tuple

t = (1, 2, 4, 5, 6, 7,)

print(t.count(4)) #return number of time 4 in tuple

print(t.index(6)) #return index value of element

Output

1 4

Termination

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