Python Programs hub
Index of the ten most-searched beginner Python programs, each with approaches, output, a dry run and practice links.
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Explore PyDebug
Python सीखने, debugging practice करने, errors समझने और output predict करने के लिए सभी useful resources एक जगह खोजें।
This directory lists every public page on PyDebug, grouped by what you are trying to do. Search by title, topic or keyword, narrow the list by category, language or difficulty, and open the page you need — no account, no sign-in, nothing to install.
182 public pages7 categories43 Hindi pagesFree · no login
How to use this directory
Type anything into the search box — a page title, an exception name such as KeyError, a topic such as loops, or a Hindi word — and the list filters as you type. The three dropdowns narrow it further: Category for the kind of page, Language for English or Hindi, and Difficulty where a page is marked beginner, intermediate or advanced. Nothing here needs an account.
Not sure where to start? If you landed here from an error message, open the error explainer and pick your exception. If you want a route rather than a single answer, follow a learning path. If you just want to run code, the Python playground is one click away. Hindi में पढ़ना है तो Hindi hub से शुरू करें।
Showing all 182 pages across 7 categories.
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🧮 Python Programs22 pages
The classic beginner programs every Python course starts with — factorial, Fibonacci, palindrome, prime numbers, star patterns and more. Each page gives you the problem statement, two or three working approaches, the exact output, a line-by-line dry run and the errors that usually break the program. Every program exists in English and in Hindi, so pick the language you think in.
Armstrong Number Program in Python
Check whether a number equals the sum of its own digits raised to the digit count — loop, function and one-liner versions.
Factorial Program in Python
Three ways to compute n! — an explicit loop, a recursive function and math.factorial — with the edge cases each one hides.
Fibonacci Series Program in Python
Print the Fibonacci sequence with a while loop, a reusable function and a generator, and trace how the two seeds move.
Multiplication Table Program in Python
Print a formatted times table with range(), f-strings and nested loops — including the alignment beginners usually get wrong.
Palindrome Program in Python
Test strings and numbers for palindromes with slicing, a two-pointer loop and reversed(), plus the case and space traps.
Prime Number Program in Python
Decide whether a number is prime with a naive loop, a square-root bound and a reusable helper — and why 1 is not prime.
Reverse a Number Program in Python
Reverse digits with modulo arithmetic or by converting to a string, and handle the trailing-zero and negative cases.
Star Pattern Programs in Python
Pyramids, triangles and diamonds built from nested loops — the row/column maths behind every star pattern question.
Sum of Digits Program in Python
Add up a number's digits with while/modulo, with str() and sum(), and with recursion — three habits, one result.
Swap Two Numbers Program in Python
Swap variables with a temporary, with tuple unpacking and with arithmetic — and why a, b = b, a never needs a temp.
Python Programs (Hindi) hub
दसों popular Python programs की Hindi index — हर page पर approach, code, output और dry run।
Show all 22 Python Programs pages
Armstrong Number Program (Hindi)
Armstrong number Hindi में — digits की power का sum, loop और function दोनों तरीके, साथ में dry run।
Factorial Program (Hindi)
Factorial Hindi में — loop, recursion और math.factorial, और हर तरीके की common galti।
Fibonacci Series Program (Hindi)
Fibonacci series Hindi में — while loop और function से series print करना, step-by-step dry run के साथ।
Multiplication Table Program (Hindi)
Multiplication table Hindi में — range() और f-string से साफ़ output, nested loop की पूरी समझ।
Palindrome Program (Hindi)
Palindrome Hindi में — string slicing [::-1] और loop दोनों से check, numbers के लिए भी वही logic।
Prime Number Program (Hindi)
Prime number Hindi में — divisor loop, square-root optimisation और 1 prime क्यों नहीं है।
Reverse a Number Program (Hindi)
Number reverse Hindi में — modulo वाला गणित और string तरीका, दोनों का dry run।
Star Pattern Programs (Hindi)
Star patterns Hindi में — pyramid, triangle और diamond के nested loops का row-column गणित।
Sum of Digits Program (Hindi)
Digits का sum Hindi में — while/modulo, str() + sum() और recursion, तीनों approaches।
Swap Two Numbers Program (Hindi)
Swap Hindi में — temp variable, tuple unpacking (a, b = b, a) और arithmetic तरीका।
🛠️ Practice Problems79 pages
Interactive challenges you solve in the browser: fix a real bug, or predict what the code prints before you run it. Every problem page explains the rule behind the bug, walks the trace, and lists the wrong fixes people try first — then hands you the editor. Start with the two indexes if you would rather browse by topic than scroll a list.
All Python practice problems
The live catalog — filter free bug-fixing and output-prediction challenges by topic, type and difficulty, then solve them in the browser.
All problems A–Z index
Every problem on one lightweight page, grouped by topic — the fastest way to scan the whole catalog without JavaScript.
Practice Python with debugging challenges
Why debugging practice beats copying tutorials, and how to build a daily habit out of short broken-code exercises.
Predict Python Output: abs() and type conversion
This PyDebug exercise focuses on abs and type conversion.
Fix KeyError: 'age' in Python
A KeyError means the dictionary lookup asked for a key that is not present.
Python break vs continue: Predict the Output
break and continue are the two ways a loop body can interrupt itself, and they do opposite things: break abandons the…
Fix NameError: name 'greet' is not defined in Python
Python executes a module from top to bottom.
Calling a function with too few arguments
TypeError: missing 1 required positional argument means the call supplied fewer values than the def line demands.
Python Chained Assignment a = b = Output
a = b = [1, 2] assigns the SAME object to both names, right to left: the list is created once, then bound to b and to…
Predict Python Output: Checking membership in a list
This PyDebug exercise focuses on checking membership in a list.
Python Class Variable Shared Between Objects
An attribute assigned in the class body belongs to the class itself, and every instance reads it through lookup — so…
Predict Python Output: Comparison chains
This PyDebug exercise focuses on comparison chains.
Show all 79 Practice Problems pages
Converting invalid text to a number
ValueError: invalid literal for int() with base 10 means int() received a string whose characters do not form a whole…
Converting text that isn't a number
int() and float() can convert text only when the text represents a valid number in the requested format.
Predict Python Output: Custom exception messages
This PyDebug exercise focuses on custom exception messages.
Python Default Arguments Output Question
Default parameter values fill in for arguments the caller omits: def greet(name, msg='Hello') lets greet('Sam') and g…
Fix KeyError: 'brightness' in Python
del data['key'] raises KeyError when the key is absent — deletion is a lookup first.
Dictionary comprehension with condition
This PyDebug exercise focuses on dictionary comprehension with condition.
Python dict.get() Default Output Question
d.get(key, default) is the crash-free lookup: it returns the stored value when the key exists and the default when it…
Python dict.get() Counting Idiom Question
This easier companion drills the core get() contract with simple data: d.get('missing', 0) yields 0 without touching…
Python Duplicate Dict Keys: Predict the Output
A dict literal with the same key twice does not error — the later value silently overwrites the earlier one, so {'a'…
Predict Python Output: Dictionary pop() with default
This PyDebug exercise focuses on dictionary pop with default.
Predict Python Output: Dictionary update() behavior
This PyDebug exercise focuses on dictionary update behavior.
ZeroDivisionError in List Comprehension
This PyDebug exercise focuses on division by zero in a list comprehension.
Python for-else Explained: When Does else Run?
Python allows else on a for loop, and its meaning surprises almost everyone: the else block runs when the loop finish…
Python enumerate start=1: Output Question
enumerate(items, start=1) numbers the items 1, 2, 3...
Python range() With Step: Predict the Output
range(start, stop, step) counts from start toward stop in jumps of step, always excluding stop itself.
Why Does My Python Function Print None?
A function without a return statement — or one whose return sits in a branch that didn't execute — hands back None.
Predict Python Output: in operator on a list
This PyDebug exercise focuses on in operator on a list.
Fix IndentationError: unexpected indent in Python
Python uses indentation as syntax.
Predict Python Output: Integer division and modulo
This PyDebug exercise focuses on integer division and modulo.
Predict Python Output: join() and split()
This PyDebug exercise focuses on join and split.
Python List Copy vs Reference Explained
b = a does not copy a list — it makes b a second name for the same object, so a.append() shows up in b and vice versa.
Predict Python Output: List extend vs append
This PyDebug exercise focuses on list extend vs append.
Predict Python Output: List methods in sequence
This PyDebug exercise focuses on list methods in sequence.
Python List Multiplication Trick Question
[0] * 3 gives [0, 0, 0] — handy.
Predict Python Output: List slicing with step
This PyDebug exercise focuses on list slicing with step.
Predict Python Output: Loop range boundaries
This PyDebug exercise focuses on loop range boundaries.
Python Loop Variable After Loop: Output Question
In Python, a for loop's variable is not scoped to the loop — after the loop finishes, the variable still exists and h…
Fix IndexError: list index out of range in Python
This program crashes with IndexError because its loop asks for one more position than the list owns — the classic res…
Missing colon after function definition
This PyDebug exercise focuses on missing colon after function definition.
Fix SyntaxError: expected ':' in Python
Every compound statement header in Python — for, while, if, elif, else, def, class, try — must end with a colon; the…
Missing indentation after if
After a header line ending in a colon, Python requires the next statement to be indented — indentation is the block s…
Mixing text and numbers in print
TypeError: can only concatenate str (not "int") to str is Python refusing to guess: 'Score: ' + 90 could mean 'Score…
Modifying a variable before it's assigned locally
If a function assigns to a name anywhere in its body, Python treats that name as local throughout the function.
Multiple except with a shared exception
This PyDebug exercise focuses on multiple except with a shared exception.
Predict Python Output: Multiple return values
This PyDebug exercise focuses on multiple return values.
Python Mutable Default Argument Bug: Predict the Output
Default arguments are evaluated once, when Python creates the function, not every time the function is called.
Python Negative Index Output Question
Negative indexes count from the end: items[-1] is the last element, items[-2] the second-to-last, and for a list of l…
Python Nested Dict KeyError: Predict Output
data['user']['address']['city'] is a chain of separate lookups, evaluated left to right, and it fails at the FIRST mi…
Nested loop with a shared variable
This PyDebug exercise focuses on nested loop with a shared variable.
not operator with different types
This PyDebug exercise focuses on not operator with different types.
Predict Python Output: Operator precedence
This PyDebug exercise focuses on operator precedence.
Predict Python Output: Rounding numbers
This PyDebug exercise focuses on rounding numbers.
Python Set Duplicates Output Question
Building a set discards duplicates on insertion: set([1, 2, 2, 3]) holds three elements, and len() reflects the dedup…
Predict Python Output: setdefault() behavior
This PyDebug exercise focuses on setdefault behavior.
Python Slice End Index Excluded: Why?
items[1:3] returns exactly two elements — positions 1 and 2, never position 3.
Predict Python Output: sorted() with a key function
This PyDebug exercise focuses on sorted with a key function.
Sorting a list with mixed types
Python 3 refuses to guess how a string compares to a number: sorted([3, 'one', 2]) raises TypeError: '<' not supporte…
Predict Python Output: String case methods
This PyDebug exercise focuses on string case methods.
Predict Python Output: String comparison basics
This PyDebug exercise focuses on string comparison basics.
Predict Python Output: String concatenation with +
This PyDebug exercise focuses on string concatenation with.
Predict Output: String Repeat Then Index
This puzzle layers two string rules: multiplication builds a longer repeated string, and indexing then reads one char…
Predict Output: String Repeat Inside a Loop
This snippet combines two rules that are individually simple: s * n repeats a string, and a loop accumulator grows on…
Python String Multiplication Output Question
'ab' * 3 builds 'ababab' — string multiplication repeats the whole string, not each character, and len() then counts…
Predict Python Output: String startswith and endswith
This PyDebug exercise focuses on string startswith and endswith.
Predict Python Output: Swapping variables with tuples
This PyDebug exercise focuses on swapping variables with tuples.
Python try/except/else: Predict the Output
try/except/else has a precise execution order: the try body runs; if it raises a matching exception, the except body…
Trying to modify a tuple
TypeError: 'tuple' object does not support item assignment enforces the whole point of tuples: once built, their slot…
Python Tuple Immutability Output Question
This prediction puzzle probes what tuple immutability really guarantees: the tuple's slots can never be reassigned, b…
Predict Python Output: Tuple unpacking with functions
This PyDebug exercise focuses on tuple unpacking with functions.
Fix NameError: name 'total' is not defined in Python
This bug is about statement order: the code reads a variable on a line that runs before the assignment that creates i…
Fix SyntaxError: cannot assign to expression in Python
This PyDebug exercise focuses on using instead of in a check.
Fix SyntaxError: invalid syntax in Python
if x = 5: is a SyntaxError in Python because a single = is assignment and only == compares.
while loop with a condition update
This PyDebug exercise focuses on while loop with a condition update.
Wrong function to find list length
Python measures containers with the built-in len(items) — there is no items.length attribute and no items.size() meth…
Wrong quote type breaks the string
A string that contains the same quote character it is delimited by ends earlier than intended: 'it's fine' terminates…
Wrong syntax for adding a new key
Adding a key to a dictionary is plain assignment: data['city'] = 'Pune'.
Predict Python Output: zip() combining two lists
This PyDebug exercise focuses on zip combining two lists.
🚨 Python Errors27 pages
Deep-dive explainers for the exceptions that actually stop your program. Each one decodes the traceback line by line, shows a runnable example that raises it, lists the real causes, and links to practice where you repair that exact error. English explainers live under /errors; the Hindi versions cover the same ground in simple Hinglish.
Python Error Explainer
Pick the exception in your traceback and get the full decode: meaning, real example, causes, fix routine and practice.
NameError: name is not defined
Typos, definition order and scope — the three reasons Python says a name does not exist, read straight from the message.
TypeError: one error, five wordings
str + int, 'not callable', 'not iterable', missing arguments — each famous TypeError message decoded and fixed.
IndexError: list index out of range
Why len(list) is never a valid index, and the four loop shapes that walk one step past the end of a sequence.
KeyError: the missing dictionary key
Exact-match rules for dict lookups, get() vs [] vs setdefault, and the nested-dictionary traps behind most KeyErrors.
ValueError: invalid literal for int()
Right type, impossible value — what int() really accepts, plus the unpacking variants of the same exception.
ZeroDivisionError: division by zero
Almost always a missing-data bug in an arithmetic costume — empty lists, averages and the modulo variant.
SyntaxError: the file never ran
Why the caret points one line late, the six causes behind almost every parse error, and how to isolate them fast.
IndentationError: broken block structure
Expected an indented block, unexpected indent, unindent does not match — plus the invisible tabs-versus-spaces version.
AttributeError: no such attribute
Reading the type in the message, the NoneType trap from in-place methods, and how dir() ends the guessing.
Common Python errors guide
One reference for sixteen Python exceptions — IndexError, KeyError, TypeError, SyntaxError, AttributeError and more.
How to fix 15 Python errors
A fix-first walkthrough of the fifteen tracebacks beginners hit most, each with the message, cause and corrected code.
Show all 27 Python Errors pages
Python Errors (Hindi) guide
छह सबसे common Python errors Hindi में — हर error का मतलब, कारण, fix और browser practice।
NameError Hindi में
name 'x' is not defined क्यों आता है — spelling, order और scope की पाँच वजहें और हर एक का fix।
TypeError कैसे fix करें (Hindi)
str + int, not callable और not iterable — TypeError के हर रूप का Hindi explanation और समाधान।
KeyError का solution (Hindi)
Dictionary में missing key क्यों crash करती है, get() कब बेहतर है और nested dict की galtiyan।
IndexError: list index out of range (Hindi)
Off-by-one, खाली list और loop की galtiyan — index range से बाहर क्यों जाता है, Hindi में।
ValueError Hindi में
int('abc') क्यों fail होता है, input() के साथ ValueError और उसे try/except से safe करना।
ZeroDivisionError Hindi में
Division by zero का असली कारण — खाली list का average और modulo, साथ में guard condition।
IndentationError Hindi में
expected an indented block और unexpected indent — tabs vs spaces की गड़बड़ Hindi में सुलझाएँ।
AttributeError Hindi में
'NoneType' object has no attribute — list और string के methods की अदला-बदली से बचने का तरीका।
SyntaxError: invalid syntax (Hindi)
Colon, bracket और quote की छूटी हुई galtiyan — Python किस line पर रुकता है और क्यों।
ModuleNotFoundError Hindi में
No module named 'x' — pip install के बाद भी error क्यों, और सही environment कैसे चुनें।
Traceback कैसे पढ़ें (Hindi)
Traceback को नीचे से ऊपर पढ़ने का तरीका — कौन-सी line असली culprit है, Hindi में step by step।
Syntax, runtime और logical error (Hindi)
तीन तरह की galtiyan में फ़र्क — कौन-सी code चलने से पहले पकड़ी जाती है और कौन-सी चुपचाप गलत output देती है।
Beginners की 12 common galtiyan (Hindi)
input() का string, = vs ==, mutable default और नौ और galtiyan जो हर नए Python learner से होती हैं।
Python Error Kaise Solve Kare Hindi
A Hindi 5-step debugging method for reading Python tracebacks, finding line numbers and fixing common NameError, TypeError and IndexError issues.
📚 Learning Resources20 pages
The long-form guides and structured paths: tutorials, the debugging method, output-prediction training, the glossary, interview questions and eight ordered learning paths that sequence problems from first syntax error to interview traps. Use these when you want a route through the material instead of a single answer.
Python tutorials
Free tutorials covering variables, data types, loops, functions and error handling, each ending in something to run.
Python debugging guide
A repeatable method for finding bugs fast: read the message, narrow the range, print the right thing, verify the fix.
Python interview questions
Ten screening questions interviewers actually ask — mutable defaults, sort() returning None, for/else — with answers.
Python glossary
Plain-English definitions for 40+ Python terms, from iterable and mutable to scope, slice, traceback and f-string.
Predict Python output
The skill of reading code and knowing what prints — worked examples, the rules behind them and interactive drills.
10 tricky output prediction questions
Scope traps, mutable defaults, chained comparisons and seven more puzzles that break confident guesses.
Output prediction question bank
24 predict-the-output questions with answers and line-by-line explanations across strings, lists, dicts and loops.
Output: for loop with range()
A loop over range(1, 10, 3) with a running total — predict every printed line including the last one.
Output: Python list slicing
nums[1:4], nums[-2:] and nums[::2] — three slices, three outputs, and the rule that explains all of them.
Output: Python string multiplication
word * 3, len() of the result, indexing into it and the '' * 0 edge case — four prints to predict.
Python learning paths
Eight ordered paths that sequence the problem catalog from first syntax error to interview traps, with free progress tracking.
Path: Python basics
Twelve broken programs that teach syntax by repair — quotes, colons, indentation and print().
Show all 20 Learning Resources pages
Path: variables and data types
Thirteen problems on names, values and conversions — NameError, ValueError, int() vs float() and type juggling.
Path: lists and dictionaries
Twenty problems on indexing, slicing, copies vs references, KeyError and safe dictionary lookups.
Path: loops
Sixteen problems on range() bounds, off-by-one errors, infinite while loops, break vs continue and for/else.
Path: functions
Twelve problems on arguments, defaults, return values and scope — from missing arguments to the mutable default trap.
Path: exceptions
Ten problems on try/except/else, finally, except ordering and when catching an exception is the wrong fix.
Path: output prediction
Eighteen ordered drills that train predict-the-output across strings, lists, dicts and control flow.
Path: interview practice
The sixteen trick questions interviewers reuse — mutable defaults, class variables, aliasing and sequencing.
PyDebug blog
Articles on debugging technique, error fixes, output prediction and how to practise Python without tutorial fatigue.
🇮🇳 Hindi Resources17 pages
Python concepts explained in simple Hindi — loops, lists, strings, dictionaries, input(), OOPs, exception handling, MCQs and board-exam output questions, plus a 30-term Hindi glossary. Hindi error guides sit in the Python Errors category and Hindi program pages in Python Programs; set the Language filter to Hindi to see all of them together.
Python Hindi hub
Hindi में Python सीखने की शुरुआत — errors, glossary, concepts और browser practice एक जगह।
Mobile se Python Code Run Kaise Kare
Hindi/Hinglish guide for running Python code on a phone browser with no app install, plus mobile keyboard mistakes and practice links.
Free Python Compiler Mobile Hindi
Mobile-first Hindi guide to choosing and using a free browser Python compiler for snippets, input, output and beginner practice.
Python Practice Questions Hindi
Hindi guide to free Python practice questions: bug-fix drills, output prediction, topic order and a daily routine for beginners.
Mobile se Python Kaise Sikhe Hindi
Beginner Hindi roadmap for learning Python from a phone: free compiler, topic order, 20-minute routine, errors and practice questions.
Python Glossary (Hindi)
Python के 30 ज़रूरी terms Hindi में — variable, list, dictionary, loop, function, exception और बाकी।
for loop Hindi में
range(), enumerate, nested loop, break-continue और for-else — पूरा for loop Hindi में।
List methods Hindi में
append, extend, insert, remove, pop, sort, reverse और copy — हर method का असर example के साथ।
String methods Hindi में
upper, lower, strip, split, join, replace और find — string के सारे ज़रूरी methods Hindi में।
Dictionary Hindi में
Dictionary बनाना, get(), keys-values-items, loop, nested dict और update — पूरी guide Hindi में।
input() Hindi में
input() हमेशा string क्यों देता है, int/float में कैसे बदलें और ValueError से कैसे बचें।
OOPs concepts Hindi में
class, object, __init__, self, inheritance, encapsulation और polymorphism आसान Hindi examples में।
Show all 17 Hindi Resources pages
Exception handling Hindi में
try, except, else, finally का सही क्रम, raise करना और bare except क्यों खतरनाक है।
Python MCQ Hindi
12 multiple choice questions Hindi में — हर एक का सही answer और उसके पीछे का explanation।
Class 12 output questions (Hindi)
CBSE Class 12 style के 8 output programs — सही answer और हर line का Hindi explanation।
Output prediction questions (Hindi)
Output predict करने के सवाल Hindi में — slice, loop, dict और string के tricky cases।
Debugging interview questions (Hindi)
Interview में पूछे जाने वाले debugging सवाल Hindi में — traceback, mutable default और is vs ==।
⚙️ Tools and Community9 pages
The interactive parts of PyDebug: the in-browser Python compiler, the AI code teacher, today's challenge, the embeddable practice widget, the public leaderboard and the pages for teachers and community members. Everything here is usable without an account unless the page says otherwise.
Python playground and compiler
Write and run Python in the browser — real interpreter, real tracebacks, input() support, no install and no signup.
PyDebug Teacher
Paste any Python program and get the real output, every bug with its line number and a line-by-line walkthrough.
Daily Python challenge
One fresh challenge every day plus a 90-day archive — a five-minute habit that keeps a streak alive.
PyDebug for classrooms
Free topic-wise assignment links, warm-up challenges and projector-friendly problems for Python teachers.
Embed a practice widget
Drop a free Python output-prediction widget into any blog, course or LMS with a single iframe tag.
PyDebug community
Six ways to take part: the daily challenge, the leaderboard, classrooms, the embed widget, the blog and the ground rules.
Community guidelines
How discussions stay safe, respectful and educational — what is encouraged, what is prohibited and how to report.
Leaderboard
Public rankings by XP, problems solved and streak length, with weekly boards and your exact position.
PyDebug Premium
What the paid plan unlocks — hard problems and an ad-free editor — and what stays free forever, including every hint.
ℹ️ Help and About8 pages
What PyDebug is, how it works, how to reach us, and the policies that govern the platform. These pages answer the account, pricing, privacy and data questions that come up before you sign up for anything.
About PyDebug
Why PyDebug teaches Python through broken code, who builds it and how the practice model works.
FAQ and help
Guest mode, premium features, XP and streaks, accounts and data — the questions learners ask most, answered.
Contact PyDebug
Reach the team about accounts, payments, bugs, content corrections or classroom use.
Privacy policy
What data PyDebug collects, how it is used and stored, and the choices you have over it.
Terms and conditions
The agreement that covers your use of PyDebug — accounts, content, payments and acceptable use.
Refund and cancellation policy
How premium billing, cancellations and refunds work, and the window in which you can request one.
Cookie policy
Which cookies PyDebug sets, what each one does and how to control them in your browser.
Disclaimer
The educational scope of PyDebug content, third-party services and the limits of what the platform guarantees.
Still looking for something?
This directory only lists pages that are public and indexable, so everything above opens without an account. Pages that belong to a signed-in learner — the dashboard, profile, notifications and checkout — are deliberately left out.
If a page is missing, the machine-readable list is always current: see sitemap.xml for every crawlable URL, all problems A–Z for the complete practice catalog, or contact us and we will point you at the right page.