Please note, this is a STATIC archive of website www.w3resource.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.
w3resource

Python: Remove the first item from a specified list

Python Basic: Exercise-112 with Solution

Write a Python program to remove the first item from a specified list.

Sample Solution-1:

Python Code:

color = ["Red", "Black", "Green", "White", "Orange"]
print("Original list elements:")
print(color)
del color[0]
print("After removing the first color:")
print(color)

Sample Output:

Original list elements:
['Red', 'Black', 'Green', 'White', 'Orange']
After removing the first color:
['Black', 'Green', 'White', 'Orange']

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Python Code:

color = ["Red", "Black", "Green", "White", "Orange"]
print("Original list elements:")
print(color)
print("\nAfter removing the first element from the said list:")
new_color = color[1:]
print(new_color)

Sample Output:

Original list elements:
['Red', 'Black', 'Green', 'White', 'Orange']

After removing the first element from the said list:
['Black', 'Green', 'White', 'Orange']

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-3:

Python Code:

color = ["Red", "Black", "Green", "White", "Orange"]
print("Original list elements:")
print(color)
print("\nAfter removing the first element from the said list:")
color.remove("Red")
print(color)

Sample Output:

Original list elements:
['Red', 'Black', 'Green', 'White', 'Orange']

After removing the first element from the said list:
['Black', 'Green', 'White', 'Orange']

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-4:

  • Use slice notation to return the last element if the list's length is more than 1.
  • Otherwise, return the whole list.

Python Code:

def tail(lst):
  return lst[1:] if len(lst) > 1 else lst
print(tail([1, 2, 3, 4]))
print(tail([1]))
print(tail(["Red", "Black", "Green", "White", "Orange"]))

Sample Output:

[2, 3, 4]
[1]
['Black', 'Green', 'White', 'Orange']

Flowchart:

Flowchart: Remove the first item from a specified list.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

 

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Python program to make file lists from current directory using a wildcard.
Next: Write a Python program to input a number, if it is not a number generates an error message.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m