Lists, Tuples, Sets and Dictionary Formula Sheet

Formula Sheet

This formula sheet lists key methods, operators, and functions used when working with Lists, Tuples, Sets, and Dictionaries in Python, along with their parameters and descriptions.

Category	Syntax / Method	Description and Symbol Definitions
Lists	list_var = [e1, e2, ...]	Creates a mutable, ordered sequence where e1, e2 are elements of any data type.
Lists	list_var.append(x)	Appends element x to the end of the list.
Lists	list_var.extend([x1, x2, ...])	Appends multiple elements x1, x2, ... from an iterable to the end of the list.
Lists	list_var.insert(i, x)	Inserts element x at the specified index position i.
Lists	list_var.remove(x)	Removes the first occurrence of the element value x from the list.
Lists	list_var.pop(i)	Removes and returns the element at the index i. If i is omitted, removes the last element.
Lists	list_var.clear()	Deletes all elements from the list, leaving it empty.
Lists / Tuples	len(seq)	Returns the total number of elements in the sequence seq.
Lists / Tuples	seq[start:stop:step]	Slices the sequence from index start up to but not including index stop, moving forward by step.
Tuples	tup_var = (e1, e2, ...)	Creates an immutable, ordered sequence where e1, e2 are elements.
Tuples	singleton = (x,)	Creates a tuple containing a single element x. The trailing comma is mandatory.
Sets	set_var = {e1, e2, ...}	Creates an unordered collection of unique elements where e1, e2 are unique items.
Sets	set_A \| set_B	Union: Returns a set containing all unique elements from set_A and set_B. Alternatively, use set_A.union(set_B).
Sets	set_A & set_B	Intersection: Returns a set containing elements common to both set_A and set_B. Alternatively, use set_A.intersection(set_B).
Sets	set_A - set_B	Difference: Returns a set containing elements that are in set_A but not in set_B. Alternatively, use set_A.difference(set_B).
Sets	set_A ^ set_B	Symmetric Difference: Returns a set containing elements in either set_A or set_B, but not both. Alternatively, use set_A.symmetric_difference(set_B).
Dictionaries	dict_var = {k1: v1, k2: v2, ...}	Creates an associative key-value mapping where k1, k2 are unique keys, and v1, v2 are their respective values.
Dictionaries	dict_var[key] = value	Adds or updates the key with the specified value in the dictionary.
Dictionaries	del dict_var[key]	Deletes the key-value pair corresponding to key from the dictionary.
Dictionaries	dict_var.clear()	Deletes all key-value pairs from the dictionary.

Lists, Tuples, Sets and Dictionary - Formula Sheet

Formula Sheet

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