Pcep – Certified Entry-Level Python Programmer Free Sample Questions

The int() function can take a second argument for the base. When the base is set to 0, Python automatically infers the base from the string's prefix. '0x' indicates hexadecimal (base 16), '0o' indicates octal (base 8), and '0b' indicates binary (base 2). This is the most robust way to handle prefixed numeral strings.

KeyboardInterrupt is the specific exception raised when the user hits the interrupt key, which is typically Ctrl+C. Catching this exception allows for graceful shutdown logic.

The loop proceeds as follows:

• items[0] is 10. It's not > 30. It's not divisible by 20. result becomes 10.
• items[1] is 20. It's not > 30. It IS divisible by 20, so continue is executed, skipping the rest of the loop body. result remains 10.
• items[2] is 30. It's not > 30. It's not divisible by 20. result becomes 10 + 30 = 40.
• items[3] is 40. It IS > 30, so break is executed, terminating the loop.
  The final value of result is 40.

This is correct. Tuples are immutable, meaning you cannot change the references to the objects they contain. However, if one of those objects is mutable (like a list), you can modify the internal state of that object. The tuple still holds a reference to the same list, but the list's content has changed.

This is the correct syntax. The required parameter base_price is listed first, followed by the optional parameter discount with its default value. This allows the function to be called as calculate_price(100) or calculate_price(100, 0.2).

This list comprehension is the most concise and Pythonic solution. It iterates through the words list, applies a filter (if len(w) > 3), and then applies a transformation (len(w)) to each item that passes the filter, all in one readable line.

This statement is False. Due to the nature of binary floating-point representation, numbers like 0.1 and 0.2 cannot be stored with perfect precision. The result of 0.1 + 0.2 is a value extremely close to, but not exactly, 0.3. This is a fundamental concept in computer science regarding floating-point arithmetic.

Python supports chained comparisons, which allows for a more readable and mathematically intuitive way to check if a value falls within a range. This expression is equivalent to (50 <= number) and (number <= 100) and is the most concise and 'Pythonic' way to write the check.

This is the correct output. The loop iterates from 0 up to 6, printing each number. When the loop variable becomes 7, the condition if number == 7 is met, 'Found it!' is printed, and the break statement terminates the loop before it can process any further numbers.

The .get() method is the correct and safest way to achieve this. It attempts to retrieve the value for the given key. If the key is not found, it returns the default value provided as the second argument ('light' in this case) instead of raising a KeyError. It does not modify the dictionary.