Untitled Quiz

String Literals

• Strings are created by surrounding text with quotation marks.
• Strings are literally written out in the code and are called string literals.
• Strings are organized as an array of characters.
• To access a substring, use the string variable name followed by square brackets with the starting and ending index of the substring.

String Operators

• Strings can be combined using the + operator (concatenation).
• Strings can be repeated using the * operator.

String Functions

• The len() function returns the length of a string.
• The upper() function converts a string to uppercase.
• The lower() function converts a string to lowercase.

Python Lists

• Lists are dynamically sized arrays that store a collection of data enclosed in square brackets ([]) and separated by commas.
• Lists are a sequence data type.
• Other sequence data types are strings and tuples.

Python Tuples

• Tuples are sequences similar to lists, but they are immutable (cannot be changed) and use parentheses (()). Parentheses are optional when creating tuples.
• Use square brackets ([]) for lists and parentheses (()) for tuples.

Python Dictionaries

• Dictionaries are collections of key-value pairs, similar to a map.
• Dictionaries are used to store data values and are enclosed in curly braces ({}) with key-value pairs separated by a colon (:).

Python Operators

• Python offers different operators for arithmetic, assignment, logical, and relational operations.
• Arithmetic operators include +, -, *, /, %, **, and //.
• Assignment operators include =, +=, -=, *=, /=, %=, **=, and //=.
• Logical operators include or, and, and not.
• Relational operators include =, !=, <>, and ==.

Python Data Types

• Python supports various data types, which categorize data items according to their kind of value.
• Data types determine the operations that can be performed on a value.
• Python's five main data types include numbers, strings, lists, tuples, and dictionaries.

Python Numbers

• Numeric data types store numerical values.
• Python supports several numeric data types:
  • int: Whole numbers (positive or negative) without decimals.
  • float: Numbers with decimals.
  • complex: Imaginary numbers written with "j" as the imaginary part.
• Numeric type variables are created when a value is assigned to them.

Python Strings

• Strings are collections of characters enclosed in single ('), double ("), or triple (''') quotes.
• Python does not have a separate character data type. A single character is a string of length one.
• Strings can be created using single, double, or triple quotes.
• Strings are instances of the str class.