Job Interview Questions and Answers Directory

Python Medium technical

Q321. How is set() implemented internally? I've seen people say that set objects in Python have O(1) membership-checking. How are they implemented internally to allow this? What sort of data structure does it use? What other implications does that implementation have?

Indeed, CPython's sets are implemented as something like dictionaries with dummy values (the keys being the members of the set), with some optimization(s) that exploit th...

#python #sets #oop

1 Answer

Python Medium technical

Q322. What is MRO in Python? How does it work?

Method Resolution Order (MRO) it denotes the way a programming language resolves a method or attribute. Python supports classes inheriting from other classes. The class b...

#python #interview-prep

1 Answer

Python Medium technical

Q323. What is the difference between old style and new style classes in Python?

Declaration-wise: New-style classes inherit from object, or from another new-style class. ```python class NewStyleClass(object): pass ``` class AnotherNewStyleClass(NewSt...

#python #oop

1 Answer

Python Hard technical

Q324. Why Python (CPython and others) uses the GIL?

In CPython, the global interpreter lock, or GIL, is a mutex that prevents multiple native threads from executing Python bytecodes at once. This lock is necessary mainly b...

#python #gil

1 Answer

Python Medium technical

Q325. How are arguments passed by value or by reference in Python?

Pass by value: Copy of the actual object is passed. Changing the value of the copy of the object will not change the value of the original object. Pass by reference: Refe...

#python #interview-prep

1 Answer

Python Medium technical

Q326. What is a boolean in Python?

Boolean is one of the built-in data types in Python, it mainly contains two values, and they are true and false. Python bool() is the method used to convert a value to a ...

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1 Answer

Python Easy technical

Q327. What is Python String format and Python String replace?

Python String Format: The String format() method in Python is mainly used to format the given string into an accurate output or result. Syntax for String format() method:...

#python #strings

2 Answer

Python Medium technical

Q328. Name some of the built-in modules in Python?

Python's "batteries included" philosophy includes an extensive set of built-in standard library modules: - **Data Structures & Utilities**: `collections` (`defaultdict`, ...

#python #modules

2 Answer

Python Easy technical

Q329. How do we convert the string to lowercase?

In Python, call the **`.lower()`** string method: ```python title = "Data Engineering INTERVIEW" clean_title = title.lower() print(clean_title) # "data engineering interv...

#python #strings

3 Answer

Python Medium technical

Q330. How to remove values from a Python array?

The elements can be removed from a Python array using remove() or pop() function. The difference between pop() and remove() will be explained in the below example. Exampl...

#python #interview-prep

1 Answer