What does a data type say about a value?
Select one:
a.
The kind of data that can be stored in the value
b.
All of these are true
c.
The amount of computer memory needed to hold the data
d.
The types of operations that can be done on the data
b. All of these are true
Which of the following best describes a variable?
Select one:
a.
A named area in computer memory that holds a value
b.
None of these are true
c.
A place where you store a value that can never change
d.
A Python statement that has random effects
a. A named area in computer memory that holds a value
Which of the following statements correctly assigns the value 42 to a variable named "theAnswer"?
Select one:
a.
42 # theAnswer
b.
42 = theAnswer
c.
theAnswer(42)
d.
theAnswer = 42
d. theAnswer = 42
Which of the following variable names are valid in Python?
Select one:
a.
All of these are valid
b.
testing123
c.
testing_123
d.
TESTING
a. All of these are valid
Which of the following variable names are invalid in Python?
Select one:
a.
testing 123
b.
testing#123
c.
All of these are invalid
d.
123_testing
c. All of these are invalid
The correct answer is b. All of these are true.
A data type provides information about the kind of data that can be stored in a value. It specifies the possible range of values and the operations that can be performed on those values.
Understanding the data type of a value is important because it determines how the value is stored in the computer's memory and the amount of memory needed to hold the data. Different data types require different amounts of memory. For example, an integer data type typically requires less memory than a floating-point data type.
Additionally, the data type dictates the set of operations that can be performed on a value. For example, arithmetic operations like addition and subtraction are typically allowed for numeric data types, while string concatenation and comparison operations are allowed for string data types.
Therefore, a data type provides information about the kind of data that can be stored, the amount of memory required, and the types of operations that can be performed on the data.