Strings

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A string is a sequence made up of one or more UNICODE characters (letters, digits, whitespace, or symbols). You can create strings using single quotes (''), double quotes (""), or triple quotes (''' '

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Immutable means the contents of a string cannot be changed after creation. Any attempt to modify a character will result in an error. Example: str1 = 'Hello' followed by str1[0] = 'h' will give TypeEr

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String indexing allows access to individual characters using square brackets []. Positive indexing starts from 0 (leftmost character) to n-1 (where n is string length). Negative indexing starts from -

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len('Computer Science') returns 16 (counts all characters including space). str1[-1] returns 'n' (the last character of 'Python' using negative indexing).

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String concatenation joins two or more strings using the + operator. Example: str1 = 'Hello' and str2 = 'World' gives str1 + str2 = 'HelloWorld'. The original strings remain unchanged after concatenat

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String repetition uses the * operator to repeat a string multiple times. 'Python' * 3 returns 'PythonPythonPython'. The original string remains unchanged. Syntax: string * number

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'in' returns True if the first string appears as substring in second string, False otherwise. 'not in' returns opposite. Examples: 'Hello' in 'Hello World' returns True, 'xyz' not in 'Hello World' ret

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String slicing extracts a substring using str[start:end:step]. 'start' is inclusive, 'end' is exclusive, 'step' is the increment. Example: 'Hello World'[1:5] returns 'ello', 'Hello World'[0:10:2] retu