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Python Examples and FAQs

A curated collection of common Python examples and frequently asked questions.
Find practical solutions and clear explanations for common issues and use cases.
Ideal for both beginners and experienced developers seeking quick answers and examples.

1.

How to Access All Arguments Passed to a Python Function

2.

How to Access Dictionary Keys and Values by Index in Python

3.

How to Access Dictionary Keys and Values with Variables in Python

4.

How to Access Enum Names and Values in Python

5.

How to Access Object Attributes by String Name in Python

6.

How to Access Parent Class Attributes and Methods in Python

7.

How to Access Request Headers and Query Parameters in Flask

8.

How to Access and Filter Dictionary Values in Python

9.

How to Access and Print Specific Items in Python Lists

10.

How to Access and Update Class Variables in Python

11.

How to Access the Index with `map()` in Python

12.

How to Add Attributes to Objects in Python

13.

How to Add Days and Weeks to Dates in Python

14.

How to Add Elements to Lists within Loops in Python

15.

How to Add Elements to Tuples in Python

16.

How to Add Items to Dictionaries in Loops

17.

How to Add Leading Zeros to Numbers in Python

18.

How to Add Milliseconds to Datetime in Python

19.

How to Add Spaces to Strings in Python

20.

How to Add User Input to Dictionaries in Python

21.

How to Add year(s) to a date in Python

22.

How to Append Dictionaries to Lists in Python

23.

How to Append and Inserting Multiple Elements in Python Lists

24.

How to Append to Lists in Python

25.

How to Assign Dictionary Keys and Values to Variables in Python

26.

How to Calculate the MD5 Hash of a File in Python

27.

How to Call Calling Functions Repeatedly

28.

How to Call Class Methods from Other Classes in Python

29.

How to Call Functions by String Name in Python

30.

How to Capture `print` Output to a Variable in Python (redirect stdout)

31.

How to Check Number Types and Converting Strings to Numbers in Python

32.

How to Check Python Syntax Without Execution

33.

How to Check String Containment in Python

34.

How to Check for Multiple Keys in a Python Dictionary

35.

How to Check for Multiple Values in a Python List: `all()` and `any()`

36.

How to Check for Valid List Index in Python

37.

How to Check for Value or Name Membership in Python Enums

38.

How to Check for Vowels in Python Strings and Lists

39.

How to Check for `None` in Python

40.

How to Check for `datetime` Objects in Python

41.

How to Check if All Values in a Python Dictionary are Equal

42.

How to Check if Any List Element Matches a Regex in Python

43.

How to Check if Two Strings Have the Same Characters in Python

44.

How to Check if a File is Empty in Python

45.

How to Check if a Line is Empty in Python

46.

How to Check if a Path is a Symbolic Link in Python

47.

How to Check if a Python Object Has a Specific Method

48.

How to Check if a Variable is a Function in Python

49.

How to Check if an Object is Iterable in Python

50.

How to Check if there are Numbers in Strings in Python

51.

How to Check, Access and Remove Keys from Nested Dictionaries

52.

How to Clear Variables in Python

53.

How to Collect List Input from Users in Python

54.

How to Combine Lists and Removing Duplicates in Python

55.

How to Compare CSV Files and Printing Differences in Python

56.

How to Compare Multiple Variables in Python

57.

How to Compare Strings and Enums in Python

58.

How to Control Loop Execution in Python: Restart, Skip, and Exit

59.

How to Convert Between Comma-Separated Strings and Lists in Python

60.

How to Convert Between JSON `null` and Python `None`

61.

How to Convert Between Letters and Numbers in Python (ASCII/Unicode)

62.

How to Convert Between Lists of Floats and Integers in Python

63.

How to Convert Between `OrderedDict` and `dict` in Python

64.

How to Convert Booleans to Integers in Python and viceversa

65.

How to Convert Bytes to Dictionaries in Python

66.

How to Convert HSV to RGB in Python: `colorsys` and `matplotlib`

67.

How to Convert Hexadecimal Strings to ASCII in Python

68.

How to Convert Integers to Binary Strings in Python

69.

How to Convert Integers to Bytes in Python

70.

How to Convert Multiline Strings to Single-Line Strings in Python

71.

How to Convert Nested Dictionaries to Objects in Python

72.

How to Convert Objects to Strings in Python

73.

How to Convert Python Dataclasses to JSON

74.

How to Convert Python Enums to Integers in and Viceversa

75.

How to Convert Python Enums to Strings and Viceversa

76.

How to Convert String Representations of Lists to Lists in Python

77.

How to Convert Tuples to Integers in Python

78.

How to Convert `timedelta` Objects to Strings in Python

79.

How to Converting Strings to Class Objects in Python

80.

How to Copy and Rename Files in Python

81.

How to Count Decimal Places in Python

82.

How to Count Keys in a Python Dictionary

83.

How to Count in For and While Loops in Python

84.

How to Create Auto-Incrementing IDs in Python Classes

85.

How to Create Class Instances from Dictionaries in Python

86.

How to Create Dates from User Input in Python

87.

How to Create Filenames with Variables in Python

88.

How to Create Lists of Numbers from 1 to N in Python

89.

How to Create Lists of Objects and Append Items to Lists in Classes in Python

90.

How to Create Lists with Repeated Values in Python

91.

How to Create Tuples and Sets from User Input in Python

92.

How to Create ZIP Archives of Directories in Python

93.

How to Decode URL Parameters in Python

94.

How to Delete Dictionaries from a List in Python

95.

How to Determine if Your Python is 32-bit or 64-bit

96.

How to Divide Without a Remainder in Python

97.

How to Exit from `if` Statements in Python

98.

How to Extract Digits from Numbers and Strings in Python

99.

How to Extract Strings Between Quotes in Python

100.

How to Filter Lists of Dictionaries in Python

101.

How to Find Common Substrings and Characters in Python

102.

How to Find Common Values in Multiple Python Lists

103.

How to Find Duplicate Characters in a String with Python

104.

How to Find Indices of Duplicate Items in a Python List

105.

How to Find Most and Least Common Elements in Python Lists and Dictionaries

106.

How to Find Overlapping Ranges in Python

107.

How to Find Python Package Dependencies

108.

How to Find and Filtering Objects in Lists in Python

109.

How to Find the File Path of a Class in Python

110.

How to Find the Most Frequent Character in a Python String

111.

How to Fix "python.exe: can't find '__main__' module" Error in Python

112.

How to Format Floats with Trailing Zeros in Python

113.

How to Format Numbers to Fixed Width in Python

114.

How to Format Python `datetime` Objects with AM/PM

115.

How to Generate Random Booleans in Python

116.

How to Generate Random Bytes, Hex Strings, and Colors in Python

117.

How to Generate Random IP Addresses in Python

118.

How to Generate Random Strings, IDs, and Filenames in Python

119.

How to Generate Random Words in Python

120.

How to Get Even or Odd Index Elements from a List in Python

121.

How to Get Exception Information (Type, File, Line Number) in Python

122.

How to Get Get Boolean Input from Users in Python

123.

How to Get Indices of a Sorted List in Python

124.

How to Get Random Keys and Values from a Python Dictionary

125.

How to Get String and Bytes Length and Size in Python

126.

How to Get the First N Characters of a String in Python

127.

How to Get the Last Key or Value in a Python Dictionary

128.

How to Get the Last N Digits of a Number in Python

129.

How to Get the Length of 2D Array in Python

130.

How to Get the Length of Generators and Iterators in Python

131.

How to Get the Number of Digits in Integers and Floats in Python

132.

How to Get the Root Project Directory in Python

133.

How to Hande Yes/No Questions with User Input in Python

134.

How to Handle Empty User Input in Python

135.

How to Handle File Paths from User Input in Python

136.

How to Handle Multi-Line User Input in Python

137.

How to Handle `None` and Set Default Values in Python

138.

How to Ignore Comment Lines When Reading Files

139.

How to Ignore Return Values in Python

140.

How to Import All Functions from a File in Python

141.

How to Inspect Python Objects and Get Attributes and Methods

142.

How to Iterate Over Lists and Strings in Reverse Order in Python

143.

How to Iterate Over Object Attributes in Python

144.

How to Iterate Through Lists of Tuples in Python

145.

How to Join Base URLs with Other URLs in Python

146.

How to Join Strings and Lists with Newlines in Python

147.

How to Join a List of Integers into a String in Python

148.

How to Keep the Python Console Window Open After Script Execution

149.

How to List All Available Versions of a Python Package

150.

How to List All Virtual Environments in Python

151.

How to Manage Cookies with `requests` in Python

152.

How to Manipulate Path Components in Python

153.

How to Merge JSON Objects in Python

154.

How to Merge Multiple JSON Files in Python

155.

How to Merge Text Files in Python

156.

How to Mock Multiple Return Values in Python Unit Tests

157.

How to Move Items in Lists in Python

158.

How to Multiply Dictionary Values in Python

159.

How to Multiply Elements in Python Lists and Tuples

160.

How to Multiply Elements in Python Tuples

161.

How to Negate Booleans in Python

162.

How to Open HTML Files and URLs in a Browser from Python

163.

How to Pass Lists as Command-Line Arguments with `argparse` in Python

164.

How to Pass Multiple Arguments to `map()` in Python

165.

How to Prevent Code Execution on Import in Python: `if __name__ == '__main__'`

166.

How to Print Alternate Characters in a Python String

167.

How to Print Bold Text in Python

168.

How to Print Dictionaries in Table Format in Python

169.

How to Print Elements of a Tuple in Python

170.

How to Print Function Output in Python

171.

How to Print Horizontal Lines and Control Newlines in Python

172.

How to Print Lists Without Brackets and Commas in Python

173.

How to Print Lists in Columns and Tables in Python

174.

How to Print Newlines in Python

175.

How to Print Rectangles with Nested Loops in Python

176.

How to Print Strings with Special Characters and Backslashes in Python

177.

How to Print Timestamps in Python Logs

178.

How to Print Variable Names in Python

179.

How to Print Variables in Hexadecimal Format in Python

180.

How to Print on the Same Line in Python

181.

How to Read Files Character by Character in Python

182.

How to Read a File Until a Specific Character in Python

183.

How to Recursively Delete Directories in Python

184.

How to Remove Accents from Strings in Python

185.

How to Remove Duplicate Dictionaries from a List in Python

186.

How to Remove Elements from Lists in Python: First, Last, and Every Nth

187.

How to Remove Elements from Tuples in Python

188.

How to Remove Empty Lines from Strings in Python

189.

How to Remove File Extensions in Python

190.

How to Remove HTML Tags from Strings in Python

191.

How to Remove Imported Modules in Python: Techniques and Caveats

192.

How to Remove Maximum and Minimum Values from a List in Python

193.

How to Remove Non-ASCII Characters from Strings in Python

194.

How to Remove Non-Alphanumeric and Non-Alphabetic Characters from Strings in Python

195.

How to Remove Non-UTF-8 Characters from Strings in Python

196.

How to Remove Parts of Strings Before or After a Character in Python

197.

How to Remove Punctuation from a List of Strings in Python

198.

How to Remove Quotes from Strings in Python

199.

How to Remove Spaces, Tabs, and Newlines from Strings in Python

200.

How to Remove URLs from Text in Python

201.

How to Remove Whitespace from JSON Output in Python

202.

How to Remove \ufeff (BOM) Characters from Strings in Python

203.

How to Remove `\xa0` (Non-Breaking Spaces) from Strings in Python

204.

How to Remove and Replace `None` Values in Python Lists

205.

How to Remove the 'b' Prefix: Converting Bytes to Strings in Python

206.

How to Remove the Decimal Part of Floats in Python

207.

How to Remove the First N Characters from a String in Python

208.

How to Remove the Last Comma from a String in Python

209.

How to Remove the Last N Characters from a String in Python

210.

How to Repeat Strings in Python

211.

How to Replace Multiple Spaces with a Single Space in Python

212.

How to Replace Spaces with Underscores in Python Strings

213.

How to Replace Values in Python Dictionaries

214.

How to Replace Words in Strings with Dictionary Values in Pytho

215.

How to Replace `None` with Empty Strings or Integers in Python

216.

How to Replace the Last or Nth Occurrence of a Substring in Python

217.

How to Restart Python Scripts

218.

How to Restrict User Input: Single Characters and Letters in Python

219.

How to Round Floats to Decimal Places in Python

220.

How to Run a Function or a Loop Only Once in Python

221.

How to Safely Remove Items from a List While Iterating in Python

222.

How to Save User Input to a File in Python

223.

How to Securely Handle Username and Password Input in Python

224.

How to Serialize Python Enums to JSON

225.

How to Set All Dictionary Values to Zero in Python

226.

How to Share Variables Between Functions in Python: Best Practices

227.

How to Shift and Rotate Lists in Python

228.

How to Skip the Header Row when Reading CSV Files in Python

229.

How to Solve "AttributeError: 'NoneType' object has no attribute 'X'" in Python

230.

How to Solve "AttributeError: 'bytes' object has no attribute 'encode'" in Python

231.

How to Solve "AttributeError: 'list' object has no attribute 'replace'" in Python

232.

How to Solve "AttributeError: 'list' object has no attribute 'split'" in Python

233.

How to Solve "AttributeError: 'set' object has no attribute 'items'" in Python

234.

How to Solve "AttributeError: 'str' object has no attribute 'append'" in Python

235.

How to Solve "AttributeError: 'str' object has no attribute 'decode'" in Python

236.

How to Solve "AttributeError: 'str' object has no attribute 'strftime'" in Python

237.

How to Solve "AttributeError: __enter__" in Python Context Managers

238.

How to Solve "AttributeError: can't set attribute" in Python

239.

How to Solve "AttributeError: module 'ffmpeg' has no attribute 'input'" in Python

240.

How to Solve "AttributeError: module 'serial' has no attribute 'Serial'" in Python

241.

How to Solve "AttributeError: module 'time' has no attribute 'clock'" in Python

242.

How to Solve "ConnectionError: Max retries exceeded with url" in Python `requests`

243.

How to Solve "EOFError: Ran out of input" with `pickle.load()` in Python

244.

How to Solve "IndexError: list index out of range" Exception in Python

245.

How to Solve "IndexError: pop from empty list" in Python

246.

How to Solve "IndexError: tuple index out of range" in Python

247.

How to Solve "IsADirectoryError: [Errno 21] Is a directory" in Python

248.

How to Solve "LookupError: unknown encoding" in Python

249.

How to Solve "ModuleNotFoundError: No module named 'Crypto'" in Python

250.

How to Solve "ModuleNotFoundError: No module named 'Cython'" in Python

251.

How to Solve "ModuleNotFoundError: No module named 'OpenSSL'" in Python

252.

How to Solve "ModuleNotFoundError: No module named 'PyQt5'" in Python

253.

How to Solve "ModuleNotFoundError: No module named 'apt_pkg'" in Python on Ubuntu

254.

How to Solve "ModuleNotFoundError: No module named 'boto3'" in Python

255.

How to Solve "ModuleNotFoundError: No module named 'bs4'" in Python

256.

How to Solve "ModuleNotFoundError: No module named 'click'" in Python

257.

How to Solve "ModuleNotFoundError: No module named 'discord'" in Python

258.

How to Solve "ModuleNotFoundError: No module named 'django'" in Python

259.

How to Solve "ModuleNotFoundError: No module named 'dotenv'" in Python

260.

How to Solve "ModuleNotFoundError: No module named 'fastapi'" in Python

261.

How to Solve "ModuleNotFoundError: No module named 'flask'" in Python

262.

How to Solve "ModuleNotFoundError: No module named 'git'" in Python

263.

How to Solve "ModuleNotFoundError: No module named 'jwt'" in Python

264.

How to Solve "ModuleNotFoundError: No module named 'keyboard'" in Python

265.

How to Solve "ModuleNotFoundError: No module named 'lxml'" in Python

266.

How to Solve "ModuleNotFoundError: No module named 'mysql'" in Python

267.

How to Solve "ModuleNotFoundError: No module named 'nltk'" in Python

268.

How to Solve "ModuleNotFoundError: No module named 'numpy'" in Python

269.

How to Solve "ModuleNotFoundError: No module named 'openai'" in Python

270.

How to Solve "ModuleNotFoundError: No module named 'pandas'" in Python

271.

How to Solve "ModuleNotFoundError: No module named 'pip'" in Python

272.

How to Solve "ModuleNotFoundError: No module named 'psutil'" in Python

273.

How to Solve "ModuleNotFoundError: No module named 'pygame'" in Python

274.

How to Solve "ModuleNotFoundError: No module named 'pymysql'" in Python

275.

How to Solve "ModuleNotFoundError: No module named 'pyodbc'" in Python

276.

How to Solve "ModuleNotFoundError: No module named 'pytest'" in Python

277.

How to Solve "ModuleNotFoundError: No module named 'pytz'" in Python

278.

How to Solve "ModuleNotFoundError: No module named 'scipy'" in Python

279.

How to Solve "ModuleNotFoundError: No module named 'seaborn'" in Python

280.

How to Solve "ModuleNotFoundError: No module named 'serial'" in Python

281.

How to Solve "ModuleNotFoundError: No module named 'skbuild'" in Python

282.

How to Solve "ModuleNotFoundError: No module named 'skimage'" in Python

283.

How to Solve "ModuleNotFoundError: No module named 'sklearn'" in Python

284.

How to Solve "ModuleNotFoundError: No module named 'spacy'" in Python

285.

How to Solve "ModuleNotFoundError: No module named 'tkinter'" in Python

286.

How to Solve "ModuleNotFoundError: No module named 'tqdm'" in Python

287.

How to Solve "ModuleNotFoundError: No module named 'urllib3'" in Python

288.

How to Solve "ModuleNotFoundError: No module named 'xgboost'" in Python

289.

How to Solve "ModuleNotFoundError: No module named 'yaml'" in Python

290.

How to Solve "NameError: name 'X' is not defined" in Python

291.

How to Solve "NameError: name 'os' is not defined" in Python

292.

How to Solve "NameError: name 'pip' is not defined" in Python

293.

How to Solve "NameError: name 'plt' is not defined" and "NameError: name 'matplotlib' is not defined" in Python

294.

How to Solve "NameError: name 'self' is not defined" in Python Classes

295.

How to Solve "NameError: name 'sys' is not defined" in Python

296.

How to Solve "No module named 'pkg\_resources'" in Python

297.

How to Solve "No such file or directory: 'requirements.txt'" with pip

298.

How to Solve "OSError: [E050] Can't find model 'en_core_web_sm'" in spaCy

299.

How to Solve "OSError: [Errno 1] Operation not permitted" during `pip install`

300.

How to Solve "OSError: [Errno 22] Invalid argument" in Python

301.

How to Solve "OSError: [Errno 30] Read-only file system" in Python

302.

How to Solve "OverflowError: Python int too large to convert to C long" in Python

303.

How to Solve "RuntimeError: dictionary/set changed size during iteration" in Python

304.

How to Solve "SyntaxError: 'break' outside loop" in Python

305.

How to Solve "SyntaxError: 'continue' not properly in loop" in Python

306.

How to Solve "SyntaxError: future feature annotations is not defined" in Python

307.

How to Solve "SyntaxError: invalid character" in Python

308.

How to Solve "SyntaxError: invalid decimal literal" in Python

309.

How to Solve "TypeError: 'bool' object is not subscriptable" in Python

310.

How to Solve "TypeError: 'set' object is not subscriptable" in Python

311.

How to Solve "TypeError: Object of type set is not JSON serializable" in Python

312.

How to Solve "TypeError: __str__ returned non-string" in Python

313.

How to Solve "TypeError: a bytes-like object is required, not 'str'" in Python

314.

How to Solve "TypeError: bad operand type for unary +/-: 'str'" in Python

315.

How to Solve "TypeError: can only join an iterable" in Python

316.

How to Solve "TypeError: expected str, bytes or os.PathLike object, not NoneType" in Python

317.

How to Solve "TypeError: got multiple values for argument" in Python

318.

How to Solve "TypeError: reduction operation 'argmax' not allowed for this dtype" in Pandas

319.

How to Solve "TypeError: takes 0 positional arguments but X were given" in Python

320.

How to Solve "TypeError: unhashable type: 'dict'" in Python

321.

How to Solve "TypeError: unhashable type: 'set'" in Python

322.

How to Solve "TypeError: unhashable type: 'slice'" in Python

323.

How to Solve "TypeError: unsupported operand type(s)" with `NoneType` in Python

324.

How to Solve "Unable to initialize device PRN" in Python

325.

How to Solve "UnboundLocalError: local variable referenced before assignment" in Python

326.

How to Solve "UnicodeDecodeError: 'charmap' codec can't decode byte" in Python

327.

How to Solve "ValueError: Columns must be same length as key" in Pandas

328.

How to Solve "ValueError: No axis named X" in Pandas DataFrames

329.

How to Solve "ValueError: could not convert string to float" in Python

330.

How to Solve "ValueError: malformed node or string" with `ast.literal_eval()` in Python

331.

How to Solve "ValueError: substring not found" in Python with `str.index()`

332.

How to Solve "ValueError: unconverted data remains" with `strptime` in Python

333.

How to Solve "ValueError: unsupported pickle protocol: 5" in Python

334.

How to Solve "ValueError: year is out of range" with `datetime.fromtimestamp()` in Python

335.

How to Solve "WebDriverException: 'geckodriver' needs to be in PATH" in Selenium

336.

How to Solve "error: invalid command 'bdist_wheel'" in Python

337.

How to Solve "requests.exceptions.InvalidSchema: No connection adapters were found"

338.

How to Solve ChromeDriver Errors in Selenium: "needs to be in PATH" and "session not created"

339.

How to Solve NumPy "TypeError: Field elements must be 2- or 3-tuples, got 1

340.

How to Solve `EOFError: EOF when reading a line` in Python

341.

How to Solve `binascii.Error: Incorrect padding` with Base64 in Python

342.

How to Solve `http.client.InvalidURL`: "URL can't contain control characters" in Python

343.

How to Solve `xml.etree.ElementTree.ParseError: not well-formed (invalid token)` in Python

344.

How to Solve f-string Syntax Errors in Python: unmatched '(', expecting '}'

345.

How to Solve the "Unreachable Code" Warning in Python

346.

How to Split Floats into Integer and Decimal Parts in Python

347.

How to Split Integers into Digits in Python

348.

How to Split Lists in Python

349.

How to Split Strings Without Removing Delimiters in Python

350.

How to Split Strings and Accessing Elements in Python

351.

How to Split Strings and Convert into Tuples in Python

352.

How to Split Strings and Remove Whitespace in Python

353.

How to Split Strings by Multiple Delimiters in Python

354.

How to Split Strings into Lists of Integers in Python

355.

How to Split Strings into Multiple Variables in Python

356.

How to Split Strings on Spaces and Punctuation in Python

357.

How to Split a String into Text and Number in Python

358.

How to Split, Reverse, and Join Strings in Python

359.

How to Style Multiline If Statements in Python

360.

How to Subtract a Value from All Numbers in a Python List

361.

How to Sum Elements of Tuples in Python

362.

How to Sum Numbers in For and While Loops in Python

363.

How to Sum Numbers in a Range in Python

364.

How to Sum and Join List of Strings in Python

365.

How to Suppress Standard Output (stdout) in Python

366.

How to Swap Keys and Values in a Python Dictionary

367.

How to Take User Input with Loops in Python

368.

How to Truncate a String in Python

369.

How to Type Hint Enums in Python

370.

How to Understand `return self` in Python Class Methods

371.

How to Unpack Dictionaries and Lists in Python

372.

How to Unzip .gz Files in Python

373.

How to Update JSON Files in Python

374.

How to Use Booleans in If Statements in Python

375.

How to Use Multiple Variables in Python `for` Loops

376.

How to Use Queues in Python

377.

How to Use Wildcards for String Matching and Filtering in Python

378.

How to Use a Zipped list in Python

379.

How to Use if-elif-else in Python List Comprehensions

380.

How to Validate User Input in Python

381.

How to Wait for Subprocesses in Python

382.

How to Work with Function Pointers (and Callables) in Python

383.

How to Write Lists of Tuples to Files in Python

384.

How to add Hours to Datetime in Python

385.

How to add Minutes to Datetime in Python

386.

How to add Months to a Date in Python

387.

How to add Quotes to a String in Python

388.

How to add Seconds to Datetime in Python

389.

How to calculate a Percentage in Python

390.

How to convert a Map object to a List in Python

391.

How to convert a Tuple to JSON in Python

392.

How to filter a JSON array in Python

393.

How to get the base of a URL in Python

394.

How to print Boolean values in Python

395.

How to print Integer values in Python

396.

How to solve "ModuleNotFoundError: No module named 'six'" in Python

397.

How to take Float user input in Python

398.

How to take Integer user input in Python

399.

How to use Conditional Formatting with f-Strings in Python

400.

How to use Python `argparse`: Default Values, Optional Arguments, and `nargs='?'`

401.

Printing Tabs in Python

402.

Shorthand and One-Line If-Elif-Else Statements in Python

403.

Why Your Python Function Prints `None` (and How to Fix It)

404.

Why `list.reverse()` Returns None in Python and How to Reverse a List Properly

405.

`pip freeze` vs. `pip list`: Understanding the Differences