Data Types, Variables, Basic I/O and Operators

What is the output of the following code? print(type(3.0) == float)

Which two of the following expressions return the value 5? (Choose two.)

A function sometimes returns None. Which expression correctly checks if the return value is not None?

A developer writes the following code: result = (5 + 3) * 2 ** 3 // 4. What is the value of result?

Which of the following is a valid Python variable name?

A developer needs to store the result of dividing two numbers, a/b, but only if b is not zero. They write: result = a / b if b != 0 else 'undefined'. What is the data type of result when b is zero?

Match each Python control flow statement to its purpose.

Which THREE of the following statements about Python operators are true?

A beginner writes: x = '10'; y = 20; print(x + y). What happens?

A developer writes: num = input('Enter a number: '); result = num * 2; print(result). If the user enters 5, what is the output?

Which data type is the result of: value = 10 // 3?

A script uses the input() function to get a user's age: age = input('Enter age: '). Later it computes age > 18. This raises a TypeError. What is the root cause?

Which TWO of the following are valid Python data types?

A developer writes the following code: x = 5; y = 2; print(x // y). What is the output?

Which THREE of the following statements about Python operators are correct?

A developer writes: total = 2 ** 3 + 4. What is the value of total?

A junior developer created a Python script to calculate the average of three quiz scores entered by the user. The script reads three numbers using input(), converts them to float, calculates the sum, and divides by 3. However, when a user enters a non-numeric value like 'ten', the script crashes with a ValueError. The developer needs to modify the script to handle such errors gracefully, allowing the user to re-enter the invalid input until a valid number is provided. Which approach should the developer implement to meet this requirement most effectively while following Python best practices?

Which THREE of the following expressions evaluate to the integer 1? (Select three.)

Which of the following is a valid floating-point literal in Python?

Which TWO of the following are valid variable names in Python? (Choose two.)

Given x = 5, which of the following assignments will cause a runtime error?

Refer to the exhibit. What is the cause of the error?

You are maintaining a legacy Python 2.7 script that calculates shipping costs. The script reads weight from user input, then calculates cost as weight * 1.5. Recently, the company upgraded to Python 3.9, and now the script raises a TypeError: can't multiply sequence by non-int of type 'float'. The input line is: weight = input('Enter weight: '). You need to fix the script minimally. Which action should you take?

A program prints a greeting: name = input("Enter name: "); print("Hello, " + name + "!"). If user enters "Alice", what is output?

What is the output of the following code? ```python print('Hello', 'World', sep='-') ```

A developer needs to store a large collection of unique user IDs (integers) and quickly check if a new ID already exists. Which data type is most appropriate for this task?

Evaluate the expression: not (True or False) and (False or True). What is the result?

A developer wrote: x = 10; y = 5; x += y * 2. What are the values of x and y after execution?

Which TWO of the following are valid Python variable names?

A Python script reads this JSON and needs to check if port 8080 is allowed. Which expression correctly checks? Assume data is already parsed into a dictionary.

A developer needs to check if a variable x is between 10 and 20 (inclusive). Which expression is correct?

Which THREE of the following are immutable data types in Python?

A network engineer uses bitwise operators to set flags for packet filtering. The variable 'flags' currently holds the integer 10 (binary 1010). To enable the second bit (value 2) and disable the fourth bit (value 8), which expression should be used?

Which operator is used to check if two values are equal in Python?

Which operator performs integer (floor) division in Python?

Based on the exhibit, which expression returns 2.5 in Python?

A program asks for the user's age and then prints a message: age = input("How old are you? "); print("You are " + age + " years old."). A user enters "twenty five" and the program prints "You are twenty five years old." which is not the intended numeric age. The requirement is to ensure only numeric ages are accepted and to convert the input to an integer. Which modification is the best?

A program checks divisibility. Which condition correctly determines if a number n is divisible by 7?

A developer runs the following code: x = 0.1; y = 0.2; print(x + y == 0.3). What is the output and why?

A developer accidentally wrote: print('Hello' + 5). What happens?

A script uses the // operator with negative numbers. For example, -7 // 2 returns -4. The developer expected -3. Which statement best explains this behavior?

Which TWO of the following are valid Python data types?

A programmer is writing a script to read a number, determine if it is even or odd, and then also use the number to calculate its square. The code: num = input("Enter a number: ") if num % 2 == 0: print("Even") else: print("Odd") square = num ** 2 print("Square:", square) When run, a TypeError occurs on the modulo line. Which fix will resolve the error and allow the later calculation to work?

A system administrator wrote a Python script to monitor disk usage. The script reads the output of a system command that returns a string like 'Used: 45%' and extracts the percentage. The code uses slicing to get the numeric part and converts to int. However, on some servers, the output format changes to 'Used: 45.2%', causing a ValueError when converting to int. The administrator needs a robust solution that works with both integer and floating-point percentages while still producing an integer result (e.g., 45 for 45.2%). Which option is the best approach?

Which THREE of the following expressions evaluate to True?

Refer to the exhibit. The code used is: name = input('Enter name: '); print('Hello', name). What will be printed if the user enters 'Alice'?

Which THREE of the following are valid Python variable names?

Which THREE of the following are Python built-in data types?

What is the output of the following code? ```python x = 10 y = 3 print(x // y * y + x % y) ```

A system administrator writes a script to monitor disk usage. The script reads a percentage from a file as a string, e.g., "100". The code: usage = open("usage.txt").read().strip() if usage > 80: print("Warning: disk usage high") else: print("Disk usage OK") Even when usage.txt contains "100", the script prints "Disk usage OK". The admin expected "Warning". What is the problem and how to fix?

A developer needs to swap the values of two variables a and b in a single line of code. Which statement correctly accomplishes this?

Which TWO of the following are valid variable names in Python? (Choose two.)

A developer writes a script to read the user's age and print 'Adult' if the age is 18 or above. The code outputs 'Adult' for age 9. What is the most likely cause?

A developer encounters a TypeError. Which line of code likely caused it?

What is the output of: print(10 // 3, 10 % 3)?

Given x = 100 and y = 105, what is the value of z if z = x + y?

A programmer writes: x = 5; y = x; x = 3; print(y). What is the output?

What is the output of the following code? ```python a = 'abc' b = a b = b + 'd' print(a) ```

A beginner writes: x = 10; y = "20"; print(x + y). What will happen?

A program evaluates the expression: (True or False) and not (True and False). What is the result?

Which TWO of the following expressions will evaluate to True?

A beginner Python learner writes a script to swap two numbers: a = 10 b = 20 a = b b = a print("a =", a, "b =", b) The output is "a = 20 b = 20". The learner expected "a = 20 b = 10". Which of the following is the most Pythonic way to fix the code?

A weather station records temperature as a string '23.5'. The technician writes code to convert to Fahrenheit for a report. Which code will produce the correct Fahrenheit value without errors?

Which operator is used for integer division in Python?

Which THREE of the following expressions evaluate to True?

What is the output of the following code? print(3 * 'ab' + 'c')

Which TWO of the following are valid ways to comment in Python?

Which TWO of the following expressions produce the integer 5?

Which TWO of the following are valid ways to determine if a variable 'x' is an integer? (Select two.)

A developer wants to read a floating-point number from user input and compute its square. Which code snippet correctly accomplishes this?

Which TWO of the following expressions evaluate to True in Python? (Choose two.)

Which TWO of the following are valid Python variable names?

After 'x = 5; x += 3', what is the value of x?

Which of the following expressions evaluates to False?

Which TWO operators in Python yield an integer result when applied to two integers?

What is the output of print(type(3 + 4.5))?

A user enters '42' at an input prompt. After executing x = input(), what is the type of x?

What is the output of the code?

A developer writes a script to calculate the average of three numbers: avg = (a + b + c) / 3. If a=5, b=10, c=15, what is the data type of avg?

A program needs to check if a number is both positive and even. Which expression correctly implements this?

What is the result of bool(0) in Python?

Which expression evaluates to False?

A company needs to calculate the average of three test scores entered by a user. The scores are integers. The programmer writes the following code: s1 = input("Enter score 1: ") s2 = input("Enter score 2: ") s3 = input("Enter score 3: ") avg = (s1 + s2 + s3) / 3 print("Average:", avg) When run, the output is incorrect. What is the most likely cause?

A programmer writes: result = 'Py' * 2 + 'thon'. What is the value of result?

Which of the following variable names is NOT valid in Python?

A developer runs the command and sees the output. Which statement about the data type is correct?

Which TWO of the following are Python membership operators?

Which of the following is a valid variable name in Python?

What is the correct way to read a floating-point number from user input and store it in a variable?

A data analyst uses Python to process a CSV file containing sales data. The file has columns: 'Product', 'Price', 'Quantity'. The analyst writes a script to compute total sales: sum of Price * Quantity for each row. The code reads each row as a list of strings. The analyst uses: total = 0; for row in reader: total += row['Price'] * row['Quantity']; print(total). The script raises a TypeError. What is the best fix?

Order the steps to define and call a function in Python.

What is the output when the user enters 25?

Which TWO of the following expressions evaluate to True?

What is the result of the expression: print(2 ** 3 ** 2) ?

A program calculates BMI. User inputs weight and height as strings. Which line correctly converts to float?

Which three of the following are Python arithmetic operators? (Choose three.)

A programmer writes: x = 5; y = "10"; z = x + y. What will happen?

What is the output of the code?

Given 'a = 10; b = 3; c = a // b; d = a % b', what is the value of c + d?

Which of the following is a valid Python variable name?

A data analyst needs to read two integers from the user and compute their average as a float. The current code: a = int(input()) b = int(input()) avg = a + b / 2 print(avg) The output is always incorrect when a=5 and b=7 (expected 6.0, actual 8.5). The analyst cannot identify the bug. What is the root cause and correct fix?

Which TWO of the following Python data types are mutable?

A developer wants to store a person's age. Which of these variable names is invalid?

A junior developer is writing a script to calculate the total cost of items in a shopping cart. The script uses variables item_price (float) and quantity (int). The code is: item_price = 2.5 quantity = 3 total = item_price * quantity print("Total: " + total) When run, this code raises a TypeError. The developer is confused because the multiplication seems correct. What is the most likely issue and the correct fix?

You are a data analyst at a retail company. You have a list of sales figures stored as strings in a list: sales = ['100', '200', '300']. You need to calculate the total sum. A colleague suggests using: total = sum(sales). However, this raises a TypeError because sum() requires numeric values. Which approach should you take to correctly calculate the total as an integer?

Which of the following are valid Python variable names? (Choose two.)

Which of the following is an invalid variable name in Python?

Which TWO data types are immutable in Python?

A developer writes: print(10 * '5'). What is the output?

Which THREE of the following are built-in Python data types? (Choose three.)

Refer to the exhibit. What will happen when this code is executed?

A student writes the following code to calculate the average of two numbers: ```python num1 = input("Enter first number: ") num2 = input("Enter second number: ") avg = (num1 + num2) / 2 print("Average:", avg) ``` When executed, the code raises a TypeError. What is the most likely cause?

A developer writes the following code: x = 5; y = x; x = 10. What are the values of x and y after execution?

Which TWO of the following expressions evaluate to 0? (Select two.)

A program prompts a user for their age using input(). Which line of code correctly stores the age as an integer?

What is the output of the following code? config = {} print('Not set' if config.get('timeout') is None else config.get('timeout'))

A script calculates total cost: price = 49.95, quantity = 3, tax_rate = 0.08. The developer writes: total = price * quantity * (1 + tax_rate). The result is printed as 161.838. Which best practice is being violated?

A developer needs to read an integer from user input and store it. Which code snippet accomplishes this?

Which THREE of the following expressions evaluate to True?

A developer is building a simple calculator that accepts two numbers and an operator string. The code: x = float(input("First: ")) y = float(input("Second: ")) op = input("Operator (+, -, *, /): ") if op == "+": result = x + y elif op == "-": result = x - y elif op == "*": result = x * y elif op == "/": result = x / y print("Result:", result) When the user enters 10, 3, and "/", the output is "Result: 3.3333333333333335". The developer wants to display only two decimal places. Which code change will achieve this without introducing errors?

A program contains this code: print(1 and 2 or 3). What is the output?

Refer to the exhibit. What is the output of the Python code?

Refer to the exhibit. A beginner Python programmer executes the code and gets an error. What is the most likely cause?

A function is designed to return False if a number is not divisible by 2. Which of the following return statements correctly implements this logic?

A developer writes: a = 3; b = 4; c = a + b / 2. What is the value of c?

A developer needs to convert a string '25' to an integer and then add 10. Which code correctly performs this?

A student tries to write a program that prints the square of a number. The code: num = 5 print("The square is " + num ** 2) When run, a TypeError occurs. Which of the following fixes the error and produces exactly the output 'The square is 25'?

Given the following code, which of the following statements are true after execution? (Choose three.) x = 10 y = 3.0 z = x / y w = x // y

A program needs to read a user's age and print a message if they are 18 or older. Which code snippet correctly accomplishes this?

A junior developer writes: x = 10; y = 3; print(x % y). What will be printed?

Given 's = "Hello"; t = s[0:3]; print(t)', what is the output?

A developer writes a script to read user input using input() and then prints it. However, the program crashes when the user enters a number. What is the most likely cause?

Which THREE of the following are Python data types?

Which data type is most appropriate to store a user's age in a Python program?

Which of the following expressions will evaluate to True?

A program calculates the total price including tax: total = price * 1.08. The variable price is assigned as price = 100.0. After execution, total is 108.0. The developer then changes price to 100. What will total be?

A junior developer writes: result = input("Enter first: ") + input("Enter second: ") and then prints result. When entering 5 and 3, the output is '53'. Which explanation is correct?

Refer to the exhibit. If the user enters 5 and 3, what is the output?

What is the output of print(10 // 3, 10 % 3)?

Which of the following variable names is valid in Python?

A developer writes: x = 5; y = 2.0; z = x / y; print(type(z)). What is the output?

An accountant uses a Python script to calculate tax: tax = price * 0.08. For price=19.99, tax results in 1.5992. However, the output should be rounded to two decimal places. Which expression should replace the current one?

Refer to the exhibit. Which of the following shows the correct output?

Which TWO of the following are valid ways to create a variable with the integer value 100?

What is the output from the interactive Python session?

Order the steps to debug a Python script using print statements.

A developer writes the following code: a = 3; b = 2; c = a / b; d = a // b; e = a % b. What are the values of c, d, e?

Consider: x = True; y = False; z = x and not y or x. What is the value of z?

Match each Python operator to its description.

You are a junior developer at a logistics company. Your team is building a system to calculate shipping costs based on package weight. The system reads weight from user input. A colleague wrote the following code: weight = input('Enter weight in kg: '); cost = weight * 2.5; print('Shipping cost:', cost). However, when testing with weight 10, the output is 'Shipping cost: 10101010101010101010' (the string '10' repeated 2.5 times? Actually, 2.5 is float, but string multiplied by float causes TypeError? Wait, string * float raises TypeError. But the symptom described suggests the code runs but produces unexpected output. Let me re-read: The output shows '10101010101010101010' which is the string '10' repeated 10 times? That would happen if weight is string and multiplied by int 10. But the code multiplies by 2.5. Actually, string * float raises TypeError, so the code would crash. The symptom must be plausible. Let me adjust: The code actually has weight = input(...), then cost = weight * 2.5, but if weight is '10', then '10' * 2.5 raises TypeError. So the symptom cannot be that output. I need to fix the stem to make sense. Instead, let's say the code is: weight = input('Enter weight: '); cost = float(weight) * 2.5; print('Cost:', cost). But then no issue. I'll create a scenario where the developer forgot to convert input to float, and then tries to multiply string by float, which causes TypeError. The correct action is to convert input to float. I'll adjust the stem accordingly. Let me rewrite the stem properly. Stem: You are a developer at a shipping company. The system calculates shipping cost as weight (kg) times rate 2.5. A colleague wrote: weight = input('Enter weight: '); cost = weight * 2.5; print('Cost:', cost). When testing with weight 10, the program crashes with TypeError. Which action should you take to fix the code?

What is the output of 'print(3 * "ab")'?

Which function is used to read user input as a string?

What is the result of 'bool(0) and bool(1)'?

A student is learning Python and writes a program to compute the area of a rectangle. The code: length = input("Enter length: ") width = input("Enter width: ") area = length * width print("Area:", area) When the user enters 5 and 3, the program crashes with a TypeError: can't multiply sequence by non-int of type 'str'. The student is puzzled because they thought input returns numbers. What is the correct explanation and fix?

Which TWO of the following are valid Python variable names?

A program uses 'x = 3.14' and 'y = int(x)'. What is the value of y?

Given the code: x = 10; y = 3.0; z = x / y; print(type(z)). What is the output?

What is the output?

What is the most appropriate fix for the error shown in the exhibit?

What is the result of 17 % 5 in Python?

A developer wants to output a variable price with two decimal places using formatting. Which line of code will produce 'Price: $12.50' for price = 12.5?

Which THREE of the following are arithmetic operators in Python?

A user enters 'Alice' for name and '30' for age. What is the output?

What does 'print(2 ** 3)' output?

A developer wants to assign the value 3.14 to a variable and later change it to the integer 3. Which of the following is true?

Which of the following expressions evaluate to True? (Choose three.)

What is the type of the result of the expression 5 + 3.0?

Given the code: ```python name = input('Enter your name: ') print('Hello, ' + name) ``` If the user enters 'Alice', what is the output?

What is the data type of z after executing z = 10 / 2?

Which FOUR of the following are correct uses of the print() function?

Order the steps to write a for loop that iterates over a range of numbers.

Which two of the following are valid Python variable names? (Choose two.)

A developer writes code to compute the average of two numbers entered by the user: x = input('Enter first number: '); y = input('Enter second number: '); avg = (x + y) / 2. The program produces an error. What is the best practice to fix the code?

A data scientist needs to read a list of floats from a file, one per line, and compute the sum. The current code: total = 0.0 with open("data.txt") as f: for line in f: total = total + line print(total) When run, a TypeError occurs: unsupported operand type(s) for +: 'float' and 'str'. The scientist knows that line is a string. Which fix will correctly sum the numbers?

After executing: a = 5; b = 2; c = a // b; d = a % b; e = a ** b. What is the value of (c + d) * 2 - e?

A developer writes a program to calculate the average of three numbers: a=10; b=20; c=30; avg = a + b + c / 3; print(avg). What is the output?

A Python program loads this JSON and accesses the first rule's action. Which expression gives the string "permit"?

Match each Python data structure to its characteristic.

What is the data type of the expression (3.14 > 2) and ('a' < 'b')?

A junior developer writes: print('Hello' + 5). This code raises an error. What is the best way to fix it?

Refer to the exhibit. What is the output?

A company runs a script that processes user input temperatures. The script expects integers but sometimes users enter floats. The current code is: temp = int(input("Enter temperature: ")). When a user enters "36.5", the script crashes with a ValueError. The developer needs to modify the script to handle both integer and float inputs gracefully, converting the input to an integer (by truncation) for processing. Which of the following is the best course of action?

What is the output of the code in the exhibit?

Which of the following is a valid Python variable name?

A company needs to process user input that must be a whole number between 1 and 100. Which code snippet correctly validates and converts the input?

What is the output when the following code is executed? try: print(1/0) except ZeroDivisionError: print("Cannot divide by zero")

A programmer needs to swap the values of two variables a and b without using a temporary variable. Which approach works in Python?

A developer is writing a program to calculate the average of three test scores. The current code reads scores as integers: a=int(input()); b=int(input()); c=int(input()); avg = (a+b+c)/3; print(avg). For scores 7, 8, and 9, the output is 8.0, but the requirement is to print the integer average (8), rounded to the nearest whole number. Which modification should the developer make to meet the requirement?

Which of the following is NOT a valid variable name in Python?

What is the output of the following code? print('Hello', 'World', sep='-', end='!\n')