{"id":4143,"date":"2023-10-24T18:59:30","date_gmt":"2023-10-24T13:29:30","guid":{"rendered":"https:\/\/python-programs.com\/?p=4143"},"modified":"2023-11-10T11:56:49","modified_gmt":"2023-11-10T06:26:49","slug":"remove-first-n-characters-from-string-in-python","status":"publish","type":"post","link":"https:\/\/python-programs.com\/remove-first-n-characters-from-string-in-python\/","title":{"rendered":"Remove First N Characters from String in Python"},"content":{"rendered":"
Strings are one of the most commonly used types in Python. We can easily make them by enclosing characters in quotes. Python considers single quotes to be the same as double quotes. String creation is as easy as assigning a value to a variable.<\/p>\n
Given a string, the task is to remove first n characters from string.<\/p>\n
Examples:<\/strong><\/p>\n Input:<\/strong><\/p>\n Output:<\/strong><\/p>\n There are several ways to remove first n characters from string some of them are:<\/p>\n It returns the characters of the string as a new string from index position start to end -1. The default values for start and end are 0 and Z, where Z is the length of the string. If neither start nor end are specified, it selects all characters in the string, from 0 to size-1, and creates a new string from those characters.<\/p>\n This slicing technique can be used to cut out a piece of string that includes all characters except the first N characters.<\/p>\n Below is the implementation:<\/strong><\/p>\n Output:<\/strong><\/p>\n To delete the first N characters from a string, we can iterate through the string’s characters one by one, selecting all characters from index position N until the end of the string.<\/p>\n Below is the implementation:<\/strong><\/p>\n Output:<\/strong><\/p>\n In Python, we can use regex to match two groups in a string, i.e.<\/p>\n Group 1: The first N characters in a string Below is the implementation:<\/strong><\/p>\n Output:<\/strong><\/p>\n Related Programs<\/strong>:<\/p>\n Strings are one of the most commonly used types in Python. We can easily make them by enclosing characters in quotes. Python considers single quotes to be the same as double quotes. String creation is as easy as assigning a value to a variable. Given a string, the task is to remove first n characters …<\/p>\nstring=\"BTechGeeks\" n=3<\/pre>\n
chGeeks<\/pre>\n
Remove First N Characters from String<\/h2>\n
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Method #1:Using slicing<\/h3>\n
# function which removes first n characters of string\r\ndef removeFirstN(string, n):\r\n # removing first n characters of string\r\n string = string[n:]\r\n # return the string\r\n return string\r\n\r\n\r\n# given string\r\nstring = \"BTechGeeks\"\r\n# given n\r\nn = 3\r\n# passing string and n to removeFirstN function\r\nprint(removeFirstN(string, n))\r\n<\/pre>\n
chGeeks<\/pre>\n
Method #2 : Using for loop<\/h3>\n
# function which removes first n characters of string\r\ndef removeFirstN(string, n):\r\n # taking a empty string\r\n newstr = \"\"\r\n # removing first n characters of string using for loop\r\n # Traverse the string from n to end\r\n for i in range(n, len(string)):\r\n newstr = newstr+string[i]\r\n\r\n # return the string\r\n return newstr\r\n\r\n\r\n# given string\r\nstring = \"BTechGeeks\"\r\n# given n\r\nn = 3\r\n# passing string and n to removeFirstN function\r\nprint(removeFirstN(string, n))\r\n<\/pre>\n
chGeeks<\/pre>\n
Method #3 :Using regex to remove first two characters<\/h3>\n
\nGroup 2 consists of every character in the string except the first N characters.
\nThe string is then modified by replacing both groups with a single group, group 2.<\/p>\nimport re\r\ndef removeGroup(k):\r\n # Only group 1 should be returned from the match object.\r\n # Other groups should be deleted.\r\n return k.group(2)\r\n# given string\r\nstring = \"BTechGeeks\"\r\nresult = re.sub(\"(^.{2})(.*)\", removeGroup, string)\r\nprint(result)\r\n<\/pre>\n
echGeeks<\/pre>\n
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