WGU D335 Intro to Python NKO2 OA | 300 Practice Questions with Verified Answers & Rationales | Python Fundamentals, Data Types, Control Flow, Functions, File I/O, Exception Handling | 2026 Update | Graded A+

Pass the WGU D335 Introduction to Programming in Python (NKO2) Objective Assessment (2026) with this comprehensive 300-question study guide. This document includes real exam-style questions, verified correct answers (graded A+) , and detailed rationales explaining the Python programming concepts behind each answer. Topics Covered – All D335 Competencies: Python Fundamentals & Syntax (25%) (print(), input(), variables, identifiers, reserved words, data types – int, float, str, bool, type(), int(), float(), str(), bool(), truthy/falsy, comments, whitespace, syntax/runtime/logic errors, NameError, TypeError, ValueError, assignment operator, literals, string concatenation, repetition, indexing, slicing, len(), in/not in, ord(), chr(), f-strings, operator precedence, //, %, **, +=) Data Types & Structures (25%) (lists – creation, indexing, slicing, append(), pop(), remove(), insert(), sort(), sorted(), reverse(), reversed(), copy(), extend(), +, *, in, len(), min(), max(), sum(), count(), index(), clear(); tuples – immutability, creation; sets – uniqueness, add(), remove(); dictionaries – key-value pairs, keys(), values(), items(), get(), in, del; list comprehensions, dictionary comprehensions, nested lists, zip(), enumerate(), map(), filter(), lambda functions, stack, queue, deque, shallow vs. deep copy) Control Flow & Loops (20%) (if/elif/else statements, ternary conditional operator, for loops (range, iterating sequences), while loops, break, continue, pass, nested loops, infinite loops, else clause in loops, all(), any()) Functions & Modules (15%) (function definition – def, parameters vs. arguments, return values, default parameters, keyword arguments, *args, **kwargs, local vs. global variables, global keyword, nonlocal keyword, scope, docstrings, import statements, from/import, aliases (as), modules: math (sqrt, pow, factorial), random (randint, random, choice, shuffle), datetime (), os (getcwd, listdir), sys (argv), json (loads, dumps), packages, , if name == "main") File I/O & Exception Handling (10%) (open() – modes: 'r', 'w', 'a', 'x', 'r+', 'w+'; read(), readline(), readlines(), write(), writelines(), seek(), tell(), with statement, csv module – r, r, csv.DictReader, csv.DictWriter; try/except/else/finally blocks, multiple except blocks, catching multiple exception types, raise, assert, exception chaining, FileNotFoundError, ValueError, KeyError, IndexError, TypeError, ZeroDivisionError) Problem Solving & Algorithms (5%) (computational thinking, IPO (Input-Process-Output), lab walkthroughs, Mad Libs, factorial, square root, unit conversion (kg to lbs), trip cost calculation, random coin flip, variable swapping, reverse binary, golf score calculation (eagle/birdie/par/bogey), integer string validation, trapezoid area, student ID formatting, max() comparison, index error handling, stock purchase cost, quantity-based discounts, CSV dictionary reading) Perfect for: WGU students taking D335 Introduction to Programming in Python WGU term exam preparation (NKO2 OA) Python beginners and intermediate learners General Python programming review Updated for the 2025–2026 WGU term 300 verified answers (100% accurate)