Python

⚡ Smart Summary Python main function marks the starting point where the interpreter begins running a program. Defined with def main() and paired with the if __name__ == “__main__” guard, it separates reusable module code from standalone script execution. 🚀 Entry point: The main function defines where execution begins, so readers can follow a program’s…

⚡ Smart Summary Python string split() is a built-in method that breaks a string into a list of substrings using a separator. It returns the pieces as list elements and accepts an optional maxsplit limit. 🔪 Separator: split() divides the string at each separator; with none, it splits on whitespace. 🔢 Maxsplit: The optional maxsplit…

⚡ Smart Summary Python string find() is a built-in method that returns the index of the first occurrence of a substring within a string. It returns -1 when the substring is not present, avoiding exceptions. 🔍 Syntax: find() takes a substring plus optional start and end indexes to limit the search range. 🎯 First match:…

⚡ Smart Summary Python len() is a built-in function that returns the number of items in an object, such as the characters in a string or the elements in a list, tuple, dictionary, or set. 🔢 Syntax: len(object) takes a single argument and returns an integer, the total count of elements it contains. 🔠 Strings:…

⚡ Smart Summary Python String format() is a built-in method that replaces curly-brace placeholders inside a template string with supplied values. Placeholders accept empty braces, positional indexes, or keyword names, and support number, alignment, and padding format specifiers for the final output. 🔤 Placeholders: Curly brackets {} mark where values go — empty, numbered {0},…

⚡ Smart Summary Python string count() is a built-in method that returns how many times a character or substring appears in a string. Optional start and end arguments limit the search to a specific slice of the text. 🔢 Return value: count() returns an integer, the number of non-overlapping occurrences, or 0 when the element…

⚡ Smart Summary Python strip() removes leading and trailing characters from a string and returns a clean copy. By default it deletes whitespace, while an optional character argument removes any of the specified characters from both ends of the original string. 🧹 Whitespace removal: strip() deletes spaces, tabs, and newlines from both ends when no…

⚡ Smart Summary Python strings are immutable sequences of characters with many built-in methods for text processing. The examples below demonstrate slicing, string operators, replace(), upper() and lower(), join(), reversing, and split() using runnable code. 🧵 Strings as objects: Python treats every string as an object, so methods attach directly to string variables. 🔤 Case…

⚡ Smart Summary Mutable and immutable objects in Python differ in whether their state changes after creation. Mutable types like lists and dictionaries change in place, while immutable types like strings and tuples cannot. 🔘 Definition: A mutable object can change its value in place, while an immutable object cannot once created. ☑️ Mutable types:…