As you read through these Python interview questions, mark the ones you can not answer by yourself. Then, in the second pass, only go through the questions you could not answer in the first place. After going through this list two to three times, you will be well https://wizardsdev.com/en/vacancy/senior-python-developer/ prepared to face a technical developer interview on Python for! When answering this interview question, a junior Python developer candidate may answer None, strings, or numbers. A mid-level developer may mention booleans, tuples, or any immutable object.
This way the garbage collector frees up some memory space for the Python interpreter. As an example, the code below is correct as this tuple and all of its elements are hashable. Please be aware that sets, dictionaries, and lists are not hashable, therefore cannot be the keys of a dictionary.
Additional Common Python Interview Questions
A namespace is a container that holds various identifiers (variables, functions, etc.). In contrast, scopes determine the visibility of these identifiers in different parts of your code. The code is correct, but it should include a newline character at the end of the string to properly format the output in the file. Use our engineer-created questions to interview and hire the most qualified Python developers for your organization. Understanding important Python libraries relevant to the role, such as Pandas, Apache Spark, and PyTorch. Companies prefer Python developers who are active on Github and contribute to open-source software projects.
- The code is correct and will sort the list of dictionaries by the age key.
- To answer behavioral interview questions, select a specific example and describe the actions you took and the results you achieved.
- Dynamically typed languages don’t require predefined data for variables and determine types at runtime based on values.
- The docstring for a code object can be accessed from the ‘__doc__’ attribute of that object.
- Python provides a useful method issubclass(a,b) to check if class a is a subclass of b.
These techniques are used for storing objects in files or databases. ‘Self’ is used as the first parameter in class methods to refer to the class instance. It allows you to access the instance’s attributes and methods within the method. Dictionary comprehension is a concise way to create dictionaries from iterable sources. It allows the creation of key-value pairs based on conditions and expressions.
How To Avoid Nested Loops
Unpickling is picking the object out of the string representation. Access specifiers (public, protected, and private) determine the visibility of class members. Public members are accessible everywhere, protected members are set within derived classes, and private members are only within the class. Scope refers to where a variable can be accessed and modified. It includes local, global, module-level, and outermost scopes. A shallow copy creates a new instance with copied values and is faster, whereas a deep copy stores values that are already copied and takes longer but is more comprehensive.
Python offers various built-in data types, including numeric types (int, float, complex), sequence types (string, list, tuple, range), mapping types (dictionary), and set types. Mutable data types can be changed after creation (e.g., lists). In other words, the memory location of the object remains the same, but its internal state can change. By contrast, immutable data types cannot (e.g., strings, tuples). Instead, you must create a new object with the desired changes. This immutability ensures that the original object maintains its integrity.
Python Built-In Decorators That Optimize Your Code Significantly
‘extend()’ adds elements of an iterable to the end of the list, whereas ‘append()’ adds a single element to the end. You can use the ‘append()’ method to add an element to the end of a list. You may be asked questions about your Python programming background and work style. The interviewers are assessing how well you would fit in with the company, so remember to show your passion and enthusiasm. The code is correct and will sort the list of dictionaries by the age key. A class defines how an instance of the class (i.e. an object) behaves while a metaclass defines how a class behaves.
You will be asked a mix of questions that test your knowledge and understanding, as well as your technical abilities. For technical questions, it is usually more important to clearly explain your thought process than arrive at the correct solution. A Namespace in Python is a mapping between a name and an object. E.g. the set of built-in exception names, the set of built-in names, local names in a function. At different moments in Python, different namespaces are created. Each namespace in Python can have a different lifetime.
What is a ‘break, continue, and pass’ in Python?
A Python Decorator is a mechanism to wrap a Python function and modify its behavior by adding more functionality to it. We can use @ symbol to call a Python Decorator function. Flask is a micro-framework based on Python to develop web applications.
A split() function works on strings to cut a large piece into smaller chunks, or sub-strings. We can specify a separator to start splitting, or it uses the space as one by default. Slicing is also a string operation for extracting a part of the string, or some part of a list.
It is also used in persisting the state of a Python object. The pass statement is used as a placeholder for future code. Nothing happens when it executes, but you avoid getting an error when empty code is not allowed. Empty code is not allowed in loops, function definitions, class definitions, or in if statements.
Its slicing and broadcasting functionality are more powerful than those of regular Python lists. Python developers are able to make dynamic edits, edits of the module during the runtime. Arrays can store only one data type while lists store any data type. Yes, since it does not have machine-level code before runtime.