List Concatenation and Replication¶ As with strings, we can use the operators + and * to concatenate and replicate lists. When + appears between two lists, the expression will be evaluated as a new list that contains the elements from both lists.

Aug 25, 2020 · Concatenation is done by + operator. Concatenation is supported by sequence data types (string, list, tuple). Concatenation is done between the same data types only. The string is an immutable sequence data type. Concatenating immutable sequence data types always results in a new object.

Nov 29, 2013 · You can use a list comprehension: >>> b = 3 >>> x = [1, 2] >>> l = [x for x in l for _ in range(b)] >>> l [1, 1, 1, 2, 2, 2] >>> Now, to fix your issue: You might want to create a new list, and append to that list >>> l = [1, 2] >>> y = [] >>> b = 3 >>> for x in l: ... for i in range(b): ... y.append(x) ... >>> y [1, 1, 1, 2, 2, 2]

Apr 12, 2024 · The following are the 6 ways to concatenate lists in Python. concatenation (+) operator; Naive Method; List Comprehension; extend() method ‘*’ operator; itertools.chain() method

Oct 22, 2024 · Like strings, we can perform concatenation and repetition in lists using the + and * operators. L1 + L2: Returns a new list object which has all elements of lists L1 and L2. n * L or L * n: Returns a new list object in which all elements of list L are repeated n times.

Mar 20, 2025 · This code uses the * operator to unpack and merge the elements of lists a and b into a new list, c.. While the * operator is concise, a for loop offers more control when custom logic is applied during concatenation.. Using a for loop. A for loop provides a manual way to concatenate lists. This approach is especially useful when additional logic needs to be applied to elements before adding ...

Concatenation and Repetition¶ Again, as with strings, the + operator concatenates lists. Similarly, the * operator repeats the items in a list a given number of times.

Jan 26, 2025 · List concatenation in Python is the process of joining two or more lists together to form a new list. The resulting list contains all the elements from the original lists in the order they were concatenated. For example, if we have list A = [1, 2] and list B = [3, 4], concatenating them will give us a new list [1, 2, 3, 4].

Jan 10, 2025 · Python offers several ways to concatenate lists, each suited to specific scenarios. Below, we explore the methods and their best-use cases. 1. Using the + Operator. The + operator is one of the simplest ways to concatenate lists. It creates a new list containing the elements of the operand lists.

Mar 2, 2022 · Discover the most efficient methods for list concatenation in Python. Learn how to merge lists with ease using various techniques and optimize your Python programming skills.