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Python Challenges: Push the first number to the end of a list

Python Challenges - 1: Exercise-28 with Solution

Write a Python program to the push the first number to the end of a list.

Sample Solution:-

Python Code:

def move_last(num_list):
    a = [num_list[0] for i in range(num_list.count(num_list[0]))]
    x = [ i for i in num_list if i != num_list[0]]
    x.extend(a)
    return(x)
l1 = [0,2,3,4,6,7,10]
l2 = [10,0,11,12,14,0,17]
print("Original List: ",l1)
print(move_last(l1))
print("Original List: ",l2)
print(move_last(l2))

Sample Output:

Original List:  [0, 2, 3, 4, 6, 7, 10]                                  
[2, 3, 4, 6, 7, 10, 0]                                                  
Original List:  [10, 0, 11, 12, 14, 0, 17]                              
[0, 11, 12, 14, 0, 17, 10]

Flowchart:

Python Flowchart: Push first number to the end of a list

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Next: Write a Python program to find majority element in a list.

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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