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Mar 14, 2013 · You can use itertools.chain() or chain.from_iterable() to flatten a list of lists (y in your case) : In [23]: lis=[1,2,3,4] In [24]: from itertools import chain In [31]: y = list(chain(*([n]*4 for n in lis))) In [32]: y Out[32]: [1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4]
1. If you have a list of 5600 elements. You transform them into strings which does not increase its number. you iterate 5600 times, in each iteration you increase k 4 times by 1 and you index into your list using k - result: index error. newlist=[2,3,1,5,6,123,436,124,223.......,213,213,213,56,2387567,3241,2136]
To resize a list, we can use slice syntax. Or we can invoke append () to expand the list's element count. We can clear a list by assigning an empty list. List. Reduce. To start, we use a slice to reduce the size of a list. We resize the list so that the last two elements are eliminated.
- Using append() function: We can append at the end of the list by using append() function. For appending any single value to the list or appending a list to the list, the syntax stays the same.
- Using ‘+’ operator: We can add values by using the “+” operator. We can use [] to add any number of values to the list. Adding multiple values can be done by using ‘, ‘ values.
- Using slicing: Using slicing in Python, single or multiple values can be added to a list. a[:0] = [x, y, z…] Here a is the list in which the values(x, y, z..)
- Using chain(): Using chain() iterator function, we can extend a list by the syntax: list(chain(a, [x, y, z..])) Here a is the list in which the values(x, y, z..)
Mar 1, 2024 · Given a list and an integer N, write a Python program to increase the size of the list by padding each element by N. Examples: Input : lst = [1, 2, 3] N = 3 Output : [1, 1, 1, 2, 2, 2, 3, 3, 3] Input : lst = ['cats', 'dogs'] N = 2 Output : ['cats', 'cats', 'dogs', 'dogs'] Approach #1 : List comprehension C/C++ Code # Python3 program to increase lis
8 Ways to Find the Python List Size 1. Find the Size of a List Using the len() Function. The len() function is the most straightforward approach to ascertain the size of a list. It is not only concise but also highly efficient, making it the go-to method in most cases.
Jun 24, 2024 · loop over elements of a list with a for-loop or a list comprehension, how to slice a list, append to Python lists, … and more! I’ve included lots of working code examples to demonstrate. Table of Contents [ hide] 1 How to create a Python list. 2 Accessing Python list elements. 3 Adding and removing elements.
