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Questions and Answers
You may use electronic devices during the examination.
You may use electronic devices during the examination.
False (B)
What is the duration of the exam?
What is the duration of the exam?
- 45 minutes
- 90 minutes
- 60 minutes (correct)
- 30 minutes
How many multiple-choice questions are on the exam?
How many multiple-choice questions are on the exam?
- 30
- 20
- 40 (correct)
- 50
Name one of the chapters you need to study for the exam.
Name one of the chapters you need to study for the exam.
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What does a 'bit' represent?
What does a 'bit' represent?
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What coding scheme is most important for storing characters?
What coding scheme is most important for storing characters?
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What is the general format of an assignment statement in Python?
What is the general format of an assignment statement in Python?
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Which of these statements about an interpreter is true?
Which of these statements about an interpreter is true?
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A variable name in Python can be a reserved keyword.
A variable name in Python can be a reserved keyword.
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The print function is used to display output on the ______.
The print function is used to display output on the ______.
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Study Notes
How Computers Store Data
- Computers store data in sequences of 0s and 1s.
- A bit represents two values, 0 and 1, like an on/off switch.
- A byte is a unit of memory used to store a letter or small number.
Storing Characters
- Characters are converted to numeric codes and stored in memory.
- ASCII is a common coding scheme that defines codes for 128 characters.
- Unicode is a newer coding scheme that is compatible with ASCII and can represent characters for other languages.
Compilers
- Compilers translate high-level language programs into separate machine language programs.
- Machine language programs can be executed at any time.
Interpreters
- Interpreters translate and execute instructions in high-level language programs one instruction at a time.
- Python uses an interpreter, meaning there is no separate machine language program.
Displaying Output with the print Function
- The
printfunction displays output on the screen.
Strings and String Literals
- A string is a sequence of characters used as data.
- A string literal is a string that appears in the code of a program.
- String literals must be enclosed in single (') or double (") quote marks.
- String literals can also be enclosed in triple quotes (''' or """) to allow for multi-line strings that can contain both single and double quotes.
Comments
- Comments are explanatory notes in a program.
- They are ignored by the interpreter and are intended for the benefit of the programmer.
- Comments begin with a # character.
- An end-line comment appears at the end of a line of code to explain its purpose.
Variables
- A variable represents a value stored in computer memory.
- Variables are used to access and manipulate data stored in memory.
- An assignment statement creates a variable and makes it reference data.
- The general format of an assignment statement is: variable = expression.
- The equal sign (=) is the assignment operator.
Variable Naming Rules
- Variable names cannot be Python keywords.
- Variable names can include letters, numbers, and underscores (_).
- Variable names must start with a letter or an underscore.
- Variable names are case-sensitive.
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