Python Programming: Testing & Debugging Quiz

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Questions and Answers

What will happen if a string that does not represent an integer is passed to the int() function?

It will return 0.

It will convert it to a float instead.

It will raise a run-time error. (correct)

It will return None.

Which arithmetic operation has the highest precedence when evaluating expressions? (Hint: PEMDAS)

** (correct)

Which function can be used to round a number to a specified number of decimal places?

format()

int()

str()

round() (correct)

What is the result of evaluating the expression 3 + 4 * 2?

11 Signup and view all the answers

Which of the following statements is true regarding float and integer types?

Conversion from float to int truncates the decimal part. Signup and view all the answers

What data type is returned by the ord() function?

Integer Signup and view all the answers

What will str(5.67) return?

'5.67' Signup and view all the answers

Which operation cannot be performed with a float index in an array?

Accessing an element Signup and view all the answers

What will happen if the string '7A' is converted to an integer in Python?

A run-time error will occur Signup and view all the answers

What is the result of using `int('7.5')` in Python?

Error due to invalid syntax Signup and view all the answers

How should the user's input be formatted to avoid syntax errors when inputting arithmetic values (+, /, -, +, etc.), parentheses, integers/floats, and commas? (Hint: Think about the scicalc.py homework)

Use parentheses with commas and optional spaces that are not between elements Signup and view all the answers

Which arithmetic operation is represented by '%' in the expression?

Remainder of division Signup and view all the answers

What key restriction is placed on submitted homework programs?

No syntax errors are allowed Signup and view all the answers

How does Python treat spaces in arithmetic expressions provided by the user, considering that there are no spaces between elements (ex. ( 23,3 ) works but (2 3, 3) does not work)?

Leading and trailing spaces are ignored Signup and view all the answers

Which of the following expressions is invalid for the scicalc.py program?

<ul> <li>(5 4.9)</li> </ul> Signup and view all the answers

What must the program do when evaluating expressions containing real numbers?

Process any arbitrary float values accurately Signup and view all the answers

What is a syntax error in the context of programming languages?

A violation of grammatical rules in the code. Signup and view all the answers

Which type of error is typically the hardest to fix?

Logic Errors Signup and view all the answers

What does the 'print' function do in programming?

Displays values provided as arguments. Signup and view all the answers

Which of the following describes a semantic error?

An error in the logical flow of the program. Signup and view all the answers

In a scenario where a program fails to compute the area of a square but attempts to print it, what type of error is illustrated?

Logic Error Signup and view all the answers

What factor contributes to Python being considered easier to use than C++?

Python utilizes its own interpreter. Signup and view all the answers

What will be the result of the expression "XYZ" < "XYA"?

False Signup and view all the answers

Which of the following statements is true regarding programming languages?

Programming languages have their own vocabulary and grammar. Signup and view all the answers

Which of the following semantically represents the operator precedence correctly?

() > exponentiation > *, /, % > +, - > <, >=, ==, != > not > and > or Signup and view all the answers

Why should programmers avoid mixing single and double quotes in their code?

It can create syntax errors. Signup and view all the answers

Which of these ranges correctly corresponds to the letter grade for a mark of 75?

B: 70 <= mark < 80 Signup and view all the answers

Which logical operator would yield a True value when both operands are True?

and Signup and view all the answers

What will be the output for the expression + (7, 3)?

10.0 Signup and view all the answers

For the expression % (25, 6), what is the expected result?

4 Signup and view all the answers

Which of the following expressions would not produce a syntax error when evaluated?

<ul> <li>(5, 2)</li> </ul> Signup and view all the answers

What will the expression *(5, 4.9) yield?

24.5 Signup and view all the answers

Which statement about input formats is correct?

Spaces between elements are not important. Signup and view all the answers

In the expression - (11, 4), what operation is being performed?

Subtraction Signup and view all the answers

What result do you expect from the expression / (20, 4)?

5.0 Signup and view all the answers

Which of the following expressions will yield a result of 0?

<ul> <li>(4, 4)</li> </ul> Signup and view all the answers

Study Notes

Testing & Debugging

Syntax errors are errors that violate grammatical rules of a programming language.
Semantic errors are errors that occur when a program executes, but produces an incorrect output.
Logic errors are mistakes in the program flow that prevent it from producing the desired output. They can be difficult to find and fix.
Python is slower than C++, however it is easier to use due to its interpreter.
Dynamic programming languages allow code to be executed without it needing to be compiled first, while static programming languages require code to be compiled before it can execute.
Python syntax uses single or double quotation marks to create strings.
Mixing single and double quotes can lead to a syntax error.

Arithmetic Operators

Arithmetic operators are symbols that perform mathematical operations. These include addition (+), subtraction (-), multiplication (*), division (/), modulus (%), and floor division (//).

Data Types

Integer (int): whole numbers with no decimal part.
Float: numbers with decimal parts.
String (str): sequence of characters.
Boolean (bool): represent either true or false.

Converting Data Types

int() converts a value to an integer.
float() converts a value to a float.
str() converts a value to a string.
bool() converts a value to a boolean.

Run-Time Errors

Attempting to convert a string that does not look like an integer to an integer (e.g., "7A" to int) will cause a run-time error.
Attempting to convert a string that does not look like a float to a float will cause a run-time error (e.g., "7A" to float).
Attempting to convert a float to an integer will result in an integer without the decimal part.

Boolean Data Type

The boolean data type represents two-value logic variables and can be either True or False.

Boolean Expressions

Boolean expressions evaluate to either True or False.
Relational operators are used to compare values and include operators like <, >, >=, <=, ==, and !=.
Logical operators are used to combine multiple Boolean expressions and include operators like 'and', 'or', and 'not'.

Rules of Operator Precedence

Parenthesis () are evaluated first.
Exponentiation (**) is evaluated next.
Multiplication, division, modulus (%), and floor division (//) are evaluated after exponentiation.
Addition and subtraction (+) are evaluated after multiplication, division, and modulus.
Relational operators ( <, >, <=, >=, ==, !=) are evaluated after addition and subtraction.
'not' is evaluated after relational operators.
'and' is evaluated after 'not'.
'or' is evaluated after 'and'.

If-Else and If-Elif-Else Statements

These statements are used to execute different code blocks based on the evaluation of conditions.
if-else statements: execute one block of code if a specific condition is true, and another block if the condition is false.
if-elif-else statements: allow the program to test multiple conditions in sequence. If the first condition is true, its corresponding code is executed. If not, the program moves to the next condition.
Chained if-elif-if: A chained conditional consists of a series of checks that are evaluated one after the other. If one check in the series evaluates to True, then all of the following checks are ignored. For the grades example, it would look like asking: if mark>=80, elif mark >= 70, elif mark >= 60, elif mark >= 50, else, all in a straight line down, no indentations.
Statement blocks in Python, statement blocks are indented using four spaces to the right of the if, elif, and else keywords.
Nested if statements: Involve placing one or more if or if-else structures inside another if or else block.

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Description

Test your understanding of key concepts in Python programming related to debugging and error types. This quiz covers syntax errors, semantic errors, logic errors, and arithmetic operators. Sharpen your skills and identify common pitfalls in code development.