List in Python

Lists are used to store multiple items in a single variable.To separate two items, you use a comma ( , ) . List uses the square brackets [ ]. Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage.

  • Sequence Type
  • Element of the list can access by index
  • They are mutable

This program demonstrates various built-in functions and methods that can be used with lists in Python.

  • The first block of code shows how to create a list and access its elements using indexing. It also shows how to change the value of an element in a list using indexing.
  • The second block of code shows how to create a list with different data types and how to access the elements of the list and their types.
  • The third block of code demonstrates how to use the clear() method to remove all elements from a list, the copy() method to create a copy of a list, the count() method to count the number of occurrences of an element in a list, the index() method to find the index of an element in a list, the len() function to find the length of a list, the max() and min() functions to find the maximum and minimum element in a list, the pop() method to remove an element from a list using an index, and the remove() method to remove an element from a list using its value.
  • The fourth block of code shows how to use the append() method to add elements to a list, the extend() method to add elements from another list, and the insert() method to insert an element at a specific index in a list.
  • The fifth block of code demonstrates how to use the range() function to create a list of numbers, the list() function to convert a string to a list, and the sort() method to sort the elements of a list in ascending or descending order. It also shows how to use the key parameter to sort the elements based on a specific key and the reverse parameter to sort the elements in descending order.

Source Code 

# List in Python
"""
Sequence Type
Mutable
a[5]
a={1,2,3,4,5}
a[0]
"""
a = [1, 2, 3, 4, 5]
print(a)
print(type(a))
a[0] = 100
print(a)
print("Slicing")
print(a[1])
print(a[-1])
print(a[0:3])
print(a[2:])
print(a[:3])
print("-----------------------------")
a = [1, True, 'Ram', 2.5, [1, 2, 3, 4]]
print(a)
print(type(a))
print(a[0], " type is ", type(a[0]))
print(a[1], " type is ", type(a[1]))
print(a[2], " type is ", type(a[2]))
print(a[3], " type is ", type(a[3]))
print(a[4], " type is ", type(a[4]))
print(a[4][1])
print("-----------------------------")
a = [10, 25, 35, 45]
print(a)
a.clear()
print(a)
a = [10, 25, 35, 45]
b = a.copy()
print(b)
a = [10, 25, 35, 45, 25, 4, 25]
print(a.count(25))
print(a.index(25))
print(len(a))
print(max(a))
print(min(a))
print(a)
a.pop(0)  # remove Element using index
print(a)
a = [10, 25, 35, 45, 25, 4, 25]
a.remove(25)  # Values
print(a)
print("-----------------------------")
names = ["Ram"]
print(names)
names.append("Sam")
names.append("Ravi")
names.append("Kumar")
print(names)
name2 = ["Sara", "Anitha"]
names.extend(name2)
print(names)
names.insert(0,"Suriya")
print(names)
print("-----------------------------")
print(list(range(5)))
print(list("Tutorjoes"))
a=[10,50,100,25,85]
print(a)
a.sort()
print(a)
a.sort(reverse=True)
print(a)
a=["Orange","Apple","Zebra"]
a.sort()
print(a)
a.sort(reverse=True)
print(a)
a=["Orange","Apple","Zebra"]
a.sort(key=len)
print(a)
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Output

[1, 2, 3, 4, 5]

[100, 2, 3, 4, 5]
Slicing
2
5
[100, 2, 3]
[3, 4, 5]
[100, 2, 3]
-----------------------------
[1, True, 'Ram', 2.5, [1, 2, 3, 4]]

1  type is  
True  type is  
Ram  type is  
2.5  type is  
[1, 2, 3, 4]  type is  
2
-----------------------------
[10, 25, 35, 45]
[]
[10, 25, 35, 45]
3
1
7
45
4
[10, 25, 35, 45, 25, 4, 25]
[25, 35, 45, 25, 4, 25]
[10, 35, 45, 25, 4, 25]
-----------------------------
['Ram']
['Ram', 'Sam', 'Ravi', 'Kumar']
['Ram', 'Sam', 'Ravi', 'Kumar', 'Sara', 'Anitha']
['Suriya', 'Ram', 'Sam', 'Ravi', 'Kumar', 'Sara', 'Anitha']
-----------------------------
[0, 1, 2, 3, 4]
['T', 'u', 't', 'o', 'r', 'j', 'o', 'e', 's']
[10, 50, 100, 25, 85]
[10, 25, 50, 85, 100]
[100, 85, 50, 25, 10]
['Apple', 'Orange', 'Zebra']
['Zebra', 'Orange', 'Apple']
['Apple', 'Zebra', 'Orange']

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