Data Types, Variables, Basic I/O and Operators

A Python programmer is analyzing the results of several expressions. Which TWO of the following expressions evaluate to a float value? (Choose two.)

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

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?

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?

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

A Python programmer wants to determine whether the variable n is an even number greater than zero. Which expression correctly evaluates to True only when n is a positive even integer?

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

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

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 contains the following assignment: `value = 5` followed by `result = value * '2'`. What is the value of `result` after these statements execute?

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 cashier script stores a product's unit price as a string read from a barcode label: price = '4.50'. The developer must compute the total for 3 units and print a numeric result. Which code produces the value 13.5?

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

A developer runs this code: a = 10 b = 3 a += b * 2 a //= b print(a) What is printed?

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 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?

Refer to the exhibit. What is the printed value?

A developer is reviewing operators in Python. Which TWO of the following statements about comparison and logical operators are correct? (Choose two.)

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

A developer writes a script to track inventory: apples = 15 oranges = 4 apples -= oranges oranges += apples print(apples, oranges) What is printed?

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?

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 login script checks whether a username entered by the user is exactly 'admin' and the account is not locked. The variable locked is a boolean. Which expression evaluates to True only when the username is 'admin' and locked is False?

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?

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

Which TWO of the following expressions produce the integer 5?

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.)

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

A Python script contains the following code: num = 7 result = num ** 2 print(result) What is the output?

Which of the following expressions evaluates to False?

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?

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 developer writes the following code to calculate a total price with tax: price = 19.99 tax_rate = 0.08 total = price + price * tax_rate print(round(total, 2)) What is printed?

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?

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

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?

A developer writes a script that records a product price. The line is: price = 19.99 Later, the script runs print(type(price)). What is displayed?

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

A Python script stores a product identifier as id = '0042'. A developer needs to print the numeric value 42 followed by the type of the converted value in one line. Which code produces the output '42 <class 'int'>'?

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

What is the output of the code?

A Python developer is reviewing a script that contains several variable declarations. They want to identify which assignments use valid variable names according to Python's naming rules. Which TWO of the following variable names are valid? (Choose two.)

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 cashier script stores a discount rate and a price, then computes the final amount. The developer writes: rate = 0.15 price = 200 final = price - price * rate print(final) What is printed?

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 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.)

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?

A script starts with: name = "Ada" age = 36 Which line correctly prints: Ada is 36 years old

A Python script contains: print(10 / 4) print(10 // 4) print(10 % 4) What output does this produce?

A programmer writes the following code: `x = 7` then `y = 2` then `z = x / y`. What is the data type and value of `z`?

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?

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 cashier script stores a price as a string and needs to apply a 10 percent discount. The code is: price = "19.99" discount = 0.10 final = price * (1 - discount) print(final) What happens when this code runs?

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 student is analyzing Python code and wants to understand the result of the expression `2 ** 3 ** 2` in Python 3. What value does this expression produce?

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

A student writes the following code: name = "Alice" age = 25 print("Name: " + name + ", Age: " + age) What happens when the code runs?

A Python script contains the following code: price = 19.99 quantity = 3 total = price * quantity print(type(total)) What is displayed when this script runs?

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 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?

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?

A student writes a program to classify a number: num = 7 result = num > 5 and num < 10 or num == 0 print(result) What is printed, and why?

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?

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 programmer writes the following code to calculate the average of two numbers: a = 5 b = 2 avg = a / b print(avg) What is the output?

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?

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?

A Python developer writes the following code to concatenate two strings: first = 'Hello' second = 'World' result = first + ' ' + second print(result) What is the output?

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?

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

Consider the following code: `x = 5` then `y = 2` then `result = x // y * y + x % y`. What is the value of `result`?

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?

A script runs: x = 5 y = x y += 3 print(x, y) What is printed?

A Python programmer writes the following code: x = 5 y = 2 result = x / y print(type(result)) What is printed?

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?

A developer needs to swap the values of two variables a and b without using a temporary variable. Which single line of code correctly performs the swap?

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.

A developer is inspecting a variable and writes: value = 7.0 // 2. What is the value and type of the result assigned to 'value'?

A Python script performs the following operations: s = "Hello" n = 5 result1 = s * 2 result2 = s + str(n) Which TWO statements about the values of result1 and result2 are true? (Choose two.)

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?

A quiz program stores a user's score as score = 7 and the number of questions as total = 2. The developer writes percentage = score / total * 100. What value is displayed?

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?

What is the output of the code in the exhibit?

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

A Python script contains the following code: x = 0.1 + 0.2 y = 0.3 print(x == y) What is printed?

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

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')