Essential things to know about List data structure in python

DATE : 22/08/2019

INTRODUCTION

In python, the list is defined as a collection of items separated by a comma within the square bracket.

which is best to use when we want to work with different values.

LIST

  • one of the main thing about a list is that items in a list need not be of the same type.
  • which is used to store multiple data at the same time.
  • Lists are mutable, they can be altered even after their creation.

LIST OPERATIONS:

Access the list:

list = ["Math",0,1,2,4,23,56,32,234,437,987,"physics","chemistry",1997,2008]

#print the list in python

print(list);

#access the list items using index

print "print the first value: ", list[0]

#access the items using slice operator

print "list[5:12]: ", list[5:12]

RESULT:

APPEND THE LIST

#append operations

list = ["Math",0,1,2,4,23,56,32,234,437,987,"physics","chemistry",1997,2008]

#append will add the in value end of the list
list.append("mango")

print(list);

#append the one list with another list
list1 = ["apple", "orange", "banana"]

#list1 append with the list
list.append(list1)

print(list)

RESULT:

LIST COUNT

#return the number of times the value "physics" appears int the list
list = ["Math",0,1,2,4,23,56,32,234,437,987,"physics","chemistry",1997,2008,"physics"]

x = list.count("physics")

print(x)

RESULT

EXTEND THE LIST

list1 = ["apple", "orange", "banana"]
list2 = ["mango"]


list1.extend(list2)

print(list1)

RESULT

INSERT VALUE TO LIST

#insert the value to particular position
list = ["Math",0,1,2,4,23,56,32,234,437,987,"physics","chemistry",1997,2008,"physics"]

list.insert(1, "english")

print(list)

POP THE LIST

#pop(delete) the list
list = ["Math",0,1,2,4,23,56,32,234,437,987,"physics","chemistry",1997,2008,"physics"]


list.pop(1)

print(list)

RESULT

REMOVE

#remove the value
list = ["Math",0,1,2,4,23,56,32,234,437,987,"physics","chemistry",1997,2008,"physics"]

list.remove(23)

print(list)

RESULT

REVERSE

#reverse the list 
list = ["Math",0,1,2,4,23,56,32,234,437,987,"physics","chemistry",1997,2008,"physics"]

list.reverse()

print(list)

RESULT

SORT

#sort the list
list = [1997,0,1,2,4,2018,23,234,56,32,437,987,2008]
list.sort()

print(list)

RESULT

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