n-celsius-dzfgg","certificationSlug":"python-pcep","examCode":"PCEP","examName":"Certified Entry-Level Python Programmer PCEP","questionText":"A data analyst has a list of temperature readings in Celsius and wants to create a new list containing only readings that are valid (>= -273.15 and <= 1000). Which code correctly creates the filtered list?","difficulty":"medium","domain":"Control Flow, Loops, Lists and Logic","domainSlug":"control-flow-loops","topic":"","questionNumber":0,"totalQuestions":0,"options":[{"key":"A","isCorrect":true,"text":"valid = [temp for temp in temps if -273.15 <= temp <= 1000]","explanation":"Correct; uses chained comparison to include boundaries.","masteryContext":""},{"key":"B","isCorrect":false,"text":"valid = [temp for temp in temps if temp > -273.15 and temp < 1000]","explanation":"Excludes -273.15 and 1000.","masteryContext":""},{"key":"C","isCorrect":false,"text":"valid = [] for t in temps: if t > -273.15 and t < 1000: valid.append(t)","explanation":"Invalid syntax; missing colon or indentation.","masteryContext":""},{"key":"D","isCorrect":false,"text":"valid = list(filter(lambda t: t >= -273.15, temps))","explanation":"Only checks lower bound.","masteryContext":""}],"correctOptionKey":"A","correctOptions":["A"],"correctAnswerText":"","isMultiSelect":false,"mainExplanation":"It uses a list comprehension with a chained comparison (`-273.15 <= temp <= 1000`) that correctly includes both boundary values. This syntax is Pythonic and ensures temperatures equal to -273.15 or 1000 are considered valid, matching the requirement exactly.","examTrap":"Python Institute often tests the distinction between inclusive (`<=`, `>=`) and exclusive (`<`, `>`) comparisons, and the trap here is that candidates may overlook the boundary values or choose a syntactically incorrect loop structure like Option C.","examTip":null,"technicalDeepDive":"Chained comparisons in Python, like `-273.15 <= temp <= 1000`, are evaluated as a single expression equivalent to `temp >= -273.15 and temp <= 1000`, but with the advantage that `temp` is evaluated only once. This is a Python-specific feature not found in many other languages, and it improves readability and performance in list comprehensions. In real-world data validation, such as sensor data filtering, inclusive boundaries are critical to avoid discarding valid extreme readings.","keyConcepts":[],"faqs":[],"eliminationLogic":null,"exhibitText":null,"exhibitUrl":null,"hasExhibit":false,"isExhibitQuestion":false,"questionPairs":null,"hasMatchingPairs":false,"isMatchingQuestion":false,"relatedQuestions":[],"breadcrumbItems":null,"nextQuestionUrl":null,"previousQuestionUrl":null,"domainPracticeUrl":null,"certificationUrl":null,"domainUrl":null,"hasAnswerOptions":true,"updatedAt":"2026-06-30T18:05:11.936+00:00","questionType":"multiple_choice"},{"id":"6331423f-d3f7-43b0-bdfc-3fe393f3a186","slug":"what-is-the-result-of-bool-0-in-python-u64pt","certificationSlug":"python-pcep","examCode":"PCEP","examName":"Certified Entry-Level Python Programmer PCEP","questionText":"What is the result of bool(0) in Python?","difficulty":"easy","domain":"Data Types, Variables, Basic I/O and Operators","domainSlug":"data-types-variables","topic":"","questionNumber":0,"totalQuestions":0,"options":[{"key":"A","isCorrect":false,"text":"0","explanation":"bool(0) returns a boolean, not integer.","masteryContext":""},{"key":"B","isCorrect":false,"text":"None","explanation":"bool never returns None.","masteryContext":""},{"key":"C","isCorrect":false,"text":"True","explanation":"0 is falsy, so bool returns False.","masteryContext":""},{"key":"D","isCorrect":true,"text":"False","explanation":"Correct; 0 is falsy.","masteryContext":""}],"correctOptionKey":"D","correctOptions":["D"],"correctAnswerText":"","isMultiSelect":false,"mainExplanation":"The bool() function in Python converts any value to a Boolean. The integer 0 is considered a falsy value, so bool(0) returns False. This is because Python defines 0, None, empty collections, and False itself as falsy.","examTrap":"Python Institute often tests th