CODEWITHSUNDEEP
pythonpython-3.x
SHRIYA DAHAL
SHRIYA DAHAL

Reputation: 19

Modify a list by deleting the first element

I don't understand what I am doing wrong. The output I receive from this code is not right.

Modify short_names by deleting the first element and changing the last element to Joe. Sample output from given program: ['Sam', 'Ann', 'Joe']

short_names = ['Gertrude', 'Sam', 'Ann', 'Joseph']
"Your solution here"
print(short_names)

My code: 

short_names = ['Gertrude', 'Sam', 'Ann', 'Joseph']

short_names.pop()
short_names.sort()

print(short_names)

Upvotes: 1

Views: 26135

Answers (5)

zeeshan12396
zeeshan12396

Reputation: 412

The Python del keyword is used to delete objects.Here, object can be variables, user-defined objects, lists, items within lists, dictionaries etc.

short_names = ['Gertrude', 'Sam', 'Ann', 'Joseph']
del short_names[0] #del will delete the object of short_names[0]

Copying short_names[1:] values from index 1 to last into a new reference variable short_names that means leaving 0 index value.

short_names=short_names[1:]

Lambda function copy values from 1 index to last index and return the list

short_=lambda x:x[1:]
print(short_(short_names))

Python list pop() is an inbuilt function in Python that removes and returns the last value from the List or the given index value.

 short_names.pop(0)#if index is not specified it will return last element

To update list
using negative index

short_names[-1]='jeo'

using positive indexing , find the length of string and reduce 1 from it because index are 0 based.

short_names[len(short_names)-1]='jeo'

delete the last element and then insert new element

short_names.pop()
short_names.append('jeo')
#or short_names.insert(index,value)

Upvotes: 0

Squirrel
Squirrel

Reputation: 21

This code worked for me:

user_input = input()
short_names = user_input.split()

del short_names[0]
short_names[2] = 'Joe'


print(short_names)

Upvotes: -1

TrueClayton
TrueClayton

Reputation: 1

user_input = input() 
short_names = user_input.split()

del short_names[0]       # delete the first element
short_names[2] = "Joe"   # change the last element to Joe

print(short_names)

Upvotes: -1

Roan
Roan

Reputation: 932

Another way: 

  short_names = ['Gertrude', 'Sam', 'Ann', 'Joseph']  
  short_names[-1] = 'Joe'  
  short_names = short_names[1:len(short_names)]  
  print(short_names)

Upvotes: 0

Taku
Taku

Reputation: 33754

You want to pop at index 0 (the first item). Without specifying the index, the default is the last index.

short_names.pop(0)

And to modify the last item, just modify the list at index -1.

short_names[-1] = "Joe"

Upvotes: 3

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