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:
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:
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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
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