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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