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Questions and Answers
Which operator is used for exponentiation in Python?
Which operator is used for exponentiation in Python?
What type of data does the Python 'int' represent?
What type of data does the Python 'int' represent?
Which of the following is NOT a standard data type in Python?
Which of the following is NOT a standard data type in Python?
What is the primary difference between a tuple and a list?
What is the primary difference between a tuple and a list?
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How are lists created in Python?
How are lists created in Python?
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Which of the following best describes a dictionary in Python?
Which of the following best describes a dictionary in Python?
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What is a string literal in programming?
What is a string literal in programming?
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How can you access a substring in a string?
How can you access a substring in a string?
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Which operator would you use in Python for integer division?
Which operator would you use in Python for integer division?
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What data type would you use to represent a decimal number in Python?
What data type would you use to represent a decimal number in Python?
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What is the correct way to create a string in Python?
What is the correct way to create a string in Python?
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Which of the following is a logical operator in Python?
Which of the following is a logical operator in Python?
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What kind of object is created when assigning a value to a variable in Python?
What kind of object is created when assigning a value to a variable in Python?
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Study Notes
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.
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