Data Types And Variables

False (B)

Lists are mutable, while tuples are immutable.

<p>key</p> Signup and view all the answers

<p>len() = Returns the number of characters in a string ord() = Returns the ordinal number of a character chr() = Returns the character corresponding to an ordinal number</p> Signup and view all the answers

<p>Base 2 (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Invert all the bits, then increment the result by 1.</p> Signup and view all the answers

<p>Velocity (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>modulo</p> Signup and view all the answers

<p>int</p> Signup and view all the answers

<p>and = True if and only if both operands are True or = True if and only if at least one operand is True not = Reverses the truth value of the operand</p> Signup and view all the answers

<p>A floating-point number (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>int</p> Signup and view all the answers

A variable in Python is a name associated with an object in memory. It can hold different types of data, but its type is determined by the object it references.

The content of a variable is the specific object it points to. In Python, it's the actual data stored in the variable.

The size of a variable refers to the number of bytes used to store the object in memory.

The data type of a variable tells us the kind of data it can store and what operations can be performed on that data.

The scope of a variable defines the region of the program where it can be accessed. Variables are declared in Python when they are first assigned a value.

NoneType is a special data type in Python representing the absence of a value. Its only value is None.

Booleans (bool) represent truth values in logic - True or False. They are used for comparisons and conditional statements.

Integers (int) are whole numbers, including positive, negative and zero. They are used for mathematical calculations.

A sequence of characters stored in a single variable, representing text data within a program.

In Python, strings are represented using single or double quotes.

• "Hello"
• 'World'
• "Hello 'World'"

A built-in function that combines two strings into one. It takes two strings as arguments and returns a new string that is the concatenation of the two.

The function len() returns the number of characters in a string. Example: len("Hello") would return 5.

A list is a flexible data structure that holds an ordered sequence of items of different data types. It is mutable, meaning you can change its elements after it's created.

Tuples are similar to lists, but they are immutable, meaning you can't change their elements once they are created. They are enclosed in parentheses ().

A dictionary is a collection of key-value pairs. The key is used to access the associated value. It is a mutable data structure, meaning you can modify it after it is created.

The most common number representation in Python. It's based on powers of 10, where each position represents a power of 10 (ones, tens, hundreds, etc.).