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Python: Append the same value /a list multiple times to a list/list-of-lists

Python List: Exercise - 159 with Solution

Write a Python program to append the same value /a list multiple times to a list/list-of-lists.

Sample Solution:

Python Code:

print("Add a value(7), 5 times, to a list:")
nums = []
nums += 5 * ['7']
print(nums)
nums1 = [1,2,3,4]
print("\nAdd 5, 6 times, to a list:")
nums1 += 6 * [5]
print(nums1)
print("\nAdd a list, 4 times, to a list of lists:")
nums1 = []
nums1 += 4 * [[1,2,5]]
print(nums1)
print("\nAdd a list, 4 times, to a list of lists:")
nums1 = [[5,6,7]]
nums1 += 4 * [[1,2,5]]
print(nums1)

Sample Output: 

Add a value(7), 5 times, to a list:
['7', '7', '7', '7', '7']

Add 5, 6 times, to a list:
[1, 2, 3, 4, 5, 5, 5, 5, 5, 5]

Add a list, 4 times, to a list of lists:
[[1, 2, 5], [1, 2, 5], [1, 2, 5], [1, 2, 5]]

Add a list, 4 times, to a list of lists:
[[5, 6, 7], [1, 2, 5], [1, 2, 5], [1, 2, 5], [1, 2, 5]]

Pictorial Presentation:

Python List: Append the same value /a list multiple times to a list/list-of-lists.
Python List: Append the same value /a list multiple times to a list/list-of-lists.
Python List: Append the same value /a list multiple times to a list/list-of-lists.
Python List: Append the same value /a list multiple times to a list/list-of-lists.

Flowchart:

Flowchart: Append the same value /a list multiple times to a list/list-of-lists.

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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Previous: Write a Python program to find the maximum and minimum values in a given list of tuples.
Next: Write a Python program to remove first specified number of elements from a given list satisfying a condition.

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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