{"id":2894,"date":"2023-10-17T20:30:58","date_gmt":"2023-10-17T15:00:58","guid":{"rendered":"https:\/\/python-programs.com\/?p=2894"},"modified":"2023-11-10T11:44:24","modified_gmt":"2023-11-10T06:14:24","slug":"python-how-to-create-a-list-and-initialize-with-same-values","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-how-to-create-a-list-and-initialize-with-same-values\/","title":{"rendered":"Python : How to Create a List and Initialize with Same Values"},"content":{"rendered":"
In Python Data Structures, a list is a type of container that is used to store multiple pieces of data at the same time. In Python, unlike Sets, the list is ordered and has a definite count. A list’s elements are indexed in a specific order, and the indexing of a list begins with 0 as the first index.<\/p>\n
This article will go over various methods to create a list and Initialize with same values.<\/p>\n
Examples:<\/strong><\/p>\n Input:<\/strong><\/p>\n Output:<\/strong><\/p>\n There are several ways create a list and initialize with same values some of them are:<\/p>\n Assume we want to make a list of strings that contains 5 identical strings, such as \u2018BTechGeeks’.<\/p>\n You can do the following to initialize a list of immutable items, such as None, strings, tuples, or frozensets, with the same value:<\/p>\n Output:<\/strong><\/p>\n [\u2018BTechGeeks’] will generate a list with a single value, which we can then multiply by 5. It will loop through the contents of the list 5 times.<\/p>\n Note:<\/strong> Never use [e]*n for mutable items. As a result, the list will contain the same object e repeated N times, as well as referencing errors.<\/p>\n List comprehension is a simple and compact syntax for creating a list from a string or another list in Python. It’s a quick way to make a new list by performing an operation on each item in the existing one. List comprehension is much faster than using the for loop to process a list.<\/p>\n The for loop in this list comprehension will iterate over the range object 5 times, adding \u2018BTechGeeks’ to the list with each iteration.<\/p>\n Below is the implementation:<\/p>\n Output:<\/strong><\/p>\n The itertools package contains a repeat() function that creates an iterator that returns the object repeatedly. This has the same issue as [e]*n and should be avoided when dealing with mutable items.<\/p>\n Below is the implementation:<\/p>\n Output:<\/strong><\/p>\n Related Programs<\/strong>:<\/p>\n In Python Data Structures, a list is a type of container that is used to store multiple pieces of data at the same time. In Python, unlike Sets, the list is ordered and has a definite count. A list’s elements are indexed in a specific order, and the indexing of a list begins with 0 …<\/p>\nsize=5 , value=\"BTechGeeks\"<\/pre>\n
['BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks']<\/pre>\n
Make a list and fill it with the same values<\/h2>\n
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Method #1:Using [] and multiply operator<\/h3>\n
# Function which converts list to string\r\ndef createList(size, value):\r\n # Using multiply operator\r\n requiredlist = [value]*size\r\n # return the list\r\n return requiredlist\r\n\r\n\r\n# Driver code\r\n# given value and size\r\nsize = 5\r\nvalue = \"BTechGeeks\"\r\n# passing value and size to createList function\r\nprint(createList(size, value))\r\n<\/pre>\n
['BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks']<\/pre>\n
Method #2:Using List Comprehension and range()<\/h3>\n
# Function which converts list to string\r\ndef createList(size, value):\r\n # Using list comprehension and range\r\n requiredlist = [value for i in range(size)]\r\n # return the list\r\n return requiredlist\r\n\r\n\r\n# Driver code\r\n# given value and size\r\nsize = 5\r\nvalue = \"BTechGeeks\"\r\n# passing value and size to createList function\r\nprint(createList(size, value))\r\n<\/pre>\n
['BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks']<\/pre>\n
Method #3: Using itertools repeat() function<\/h3>\n
#importing itertools\r\nimport itertools\r\n\r\n# Function which converts list to string\r\ndef createList(size, value):\r\n # Using repeat()\r\n requiredlist = list(itertools.repeat(value, size))\r\n # return the list\r\n return requiredlist\r\n\r\n\r\n# Driver code\r\n# given value and size\r\nsize = 5\r\nvalue = \"BTechGeeks\"\r\n# passing value and size to createList function\r\nprint(createList(size, value))\r\n<\/pre>\n
['BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks', 'BTechGeeks']<\/pre>\n
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