10 Python Tricks Every Developer Should Master in 2025 Quiz

Sharpen your Python skills for backend development in 2025 with these essential language tricks and lesser-known features. Boost code readability, efficiency, and reliability with practical, modern Python know-how.

1. Using the Walrus Operator

   Which of the following code snippets correctly uses the walrus operator (:=) to read input until 'quit' is entered?

   1. while input() == 'quit': print(line)
   2. while input() != ('quit' := line): print(line)
   3. while (line := input()) != 'quit': print(line)
   4. while line == (input() := 'quit'): print(line)

   Explanation: The correct use of the walrus operator assigns input() to 'line' and compares it to 'quit' in the while condition. Option B improperly assigns 'quit' inside the input, which is invalid. Option C never stores the input. Option D tries to assign to 'quit', which is not allowed. Only A is syntactically valid and achieves the intended functionality.

2. Unpacking with the Asterisk

   What will be the output of 'a, *b, c = [1, 2, 3, 4, 5]' and what does the asterisk (*) do?

   1. a=1, b=2, c=[3, 4, 5]; packs trailing elements into c
   2. a=[1, 2], b=3, c=4,5; splits the list on b
   3. a=1, b=[2, 3, 4], c=5; collects the middle elements into b
   4. a=1, b=2,3, c=4,5; puts multiple assignment in b

   Explanation: The asterisk (*) in unpacking collects all items between the two fixed ends into a list assigned to 'b'. The other options incorrectly assign the asterisk to the wrong variable or misrepresent the output structure. Only collecting the middle elements into a list is correct for this pattern.

3. Dictionary Merge Operators

   How can you merge two dictionaries 'd1' and 'd2' into a new dictionary in Python 3.9+?

   1. d3 = d1 | d2
   2. d3 = d1.merge(d2)
   3. d3 = d1 + d2
   4. d3 = merge(d1, d2)

   Explanation: Starting with Python 3.9, the '|' operator allows merging two dictionaries, producing a new one. The '+' operator is invalid for dictionaries. 'merge()' and '.merge()' are not built-in dictionary methods in Python. The vertical bar operator is the recommended modern approach.

4. Enumerate for Index and Value

   Which built-in Python function allows looping over a list while having access to both index and value at once?

   1. zip()
   2. map()
   3. enumerate()
   4. filter()

   Explanation: The enumerate() function returns pairs of (index, value) when iterating over an iterable. zip() combines two or more iterables. map() and filter() process iterables but do not provide index information directly. Only enumerate() provides both index and item cleanly.

5. Using pathlib for File Paths

   Why is using 'pathlib.Path' preferred over using raw string paths in modern Python for file and directory operations?

   1. It forces all file operations to be asynchronous
   2. It automatically makes all paths absolute
   3. It provides object-oriented, cross-platform path manipulation
   4. It executes file operations faster by default

   Explanation: pathlib.Path makes path handling more readable and robust, supports both Windows and Unix-like systems, and provides object-oriented methods. It does not guarantee faster execution, force absolute paths, or require asynchronous operations. Its main benefit is maintaining consistent, readable, and cross-platform file paths.