Python has become a number one and widely used language in the programming world. The current machine learning boom has raised the number of Developers learning Python. It’s highly versatility nature made it widely acceptable in web, desktop apps, and in many other areas.
The popularity for Python is rising day by day. Python Certification is the most sought-after skill in programming domain. In this Python Interview Questions blog, we will introduce you to the most frequently asked questions in Python interviews. Our Python Interview Questions is the one-stop resource from where you can boost your interview preparation. We have prepared set of questions on Python Programming basics which will help you with different expertise levels to reap the maximum benefit from our blog.
Python Basic Interview Questions
1Q. What is Python?
Ans: Python is a high-level and object-oriented programming language with unified semantics designed primarily for developing apps and web. It is the core language in the field of Rapid Application Development (RAD) as it offers options such as dynamic binding and dynamic typing.
2Q. What are the benefits of Python?
Ans: The benefits of Python are as follows:
- Speed and Productivity:Utilizing the productivity and speed of Python will enhance the process control capabilities and possesses strong integration.
- Extensive Support for Libraries:Python provides a large standard library that includes areas such as operating system interfaces, web service tools, internet protocols, and string protocols. Most of the programming tasks are already been scripted in the standard library which reduces effort and time.
- User-friendly Data Structures:Python has an in-built dictionary of data structures that are used to build fast user-friendly data structures.
- Easy Learning:Python provides excellent readability and simple syntaxes to make it easy for beginners to learn.
3Q. What are the key features of Python?
Ans: The following are the significant features of Python, and they are:
- Interpreted Language:Python is an interpreted language that is used to execute the code line by line at a time. This makes debugging easy.
- Highly Portable:As Python can run on different platforms such as Unix, Macintosh, Linux, Windows, and so on. So, we can say that it is a highly portable language.
- Extensible:It ensures that the Python code can be compiled on various other languages such as C, C++ and so on.
- GUI programming Support:It implies that the Python provides support to develop graphical user interfaces
4Q. What type of language is Python? Programming or Scripting?
Ans: Python is suitable for scripting, but in general it is considered as a general-purpose programming language.
5Q. What are the applications of Python?
Ans: The applications of Python are as follows:
- GUI based desktop applications
- Image processing applications
- Business and Enterprise applications
- Web and web framework applications
6Q. What is the difference between list and tuple in Python?
Ans: The difference between tuple and list are as follows:
|The list is mutable (can be changed)||A tuple is immutable (remains constant)|
|These lists performance is slower||Tuple performance is faster when compared to lists|
|Syntax: list_1 = [10, ‘Chelsea’, 20]||Syntax: tup_1 = (10, ‘Chelsea’, 20)|
7Q.How is Python an interpreted language?
Ans: An interpreted language is any programming language which is not in machine level code before runtime. Therefore, Python is an interpreted language.
8Q.What is pep 8?
Ans: PEP stands for Python Enhancement Proposal. It is a set of rules that specify how to format Python code for maximum readability.
9Q. How is memory managed in Python?
Ans: Memory management in python is managed by Python private heap space. All Python objects and data structures are located in a private heap. The programmer does not have access to this private heap. The python interpreter takes care of this instead.
- The allocation of heap space for Python objects is done by Python’s memory manager. The core API gives access to some tools for the programmer to code.
- Python also has an inbuilt garbage collector, which recycles all the unused memory and so that it can be made available to the heap space.
10Q. What is namespace in Python?
Ans: A namespace is a naming system used to make sure that names are unique to avoid naming conflicts.
11Q. What is PYTHONPATH?
Ans: It is an environment variable which is used when a module is imported. Whenever a module is imported, PYTHONPATH is also looked up to check for the presence of the imported modules in various directories. The interpreter uses it to determine which module to load.
12Q. What are python modules? Name some commonly used built-in modules in Python?
Ans: Python modules are files containing Python code. This code can either be functions classes or variables. A Python module is a .py file containing executable code.
Some of the commonly used built-in modules are:
- DATA TIME
13Q. Define modules in Python?
Ans: Module is defined as a file that includes a set of various functions and Python statements that we want to add in our application.
Example of creating` a module:
In order to create a module first, we need to save the code that we want in a file with .py extension.
Save the module with module.py
Print(“Hi, ” + name)
14Q. What are the built-in types available in Python?
Ans: The built-in types in Python are as follows:
- Complex numbers
- Floating-point numbers
- Built-in functions
15Q. What are Python Decorators?
Ans: Decorator is the most useful tool in Python as it allows programmers to alter the changes in the behavior of class or function.
Example for Python Decorator is:
16Q. How do we find bugs and statistical problems in Python?
Ans: We can detect bugs in python source code using a static analysis tool named PyChecker. Moreover, there is another tool called PyLint that checks whether the Python modules meet their coding standards or not.
17Q. What is the difference between .py and .pyc files?
Ans: .py files are Python source files. .pyc files are the compiled bytecode files that are generated by the Python compiler
18Q. How do you invoke the Python interpreter for interactive use?
Ans: By using python or pythonx.y we can invoke Python interpreter. where x.y is the version of the Python interpreter.
19Q. Define String in Python?
Ans: String in Python is formed using a sequence of characters. Value once assigned to a string cannot be modified because they are immutable objects. String literals in Python can be declared using double quotes or single quotes.
20Q. What do you understand by the term namespace in Python?
Ans: A namespace in Python can be defined as a system that is designed to provide a unique name for every object in python. Types of namespaces that are present in Python are:
- Local namespace
- Global namespace
- Built-in namespace
Scope of an object in Python:
Scope refers to the availability and accessibility of an object in the coding region.
21Q. How do you create a Python function?
Ans: Functions are defined using the def statement.
An example might be def foo(bar):
22Q. Define iterators in Python?
Ans: In Python, an iterator can be defined as an object that can be iterated or traversed upon. In another way, it is mainly used to iterate a group of containers, elements, the same as a list.
23Q. How does a function return values?
Ans: Functions return values using the return statement.
24Q. Define slicing in Python?
Ans: Slicing is a procedure used to select a particular range of items from sequence types such as Strings, lists, and so on.
25Q. How can Python be an interpreted language?
Ans: As in Python the code which we write is not machine-level code before runtime so, this is the reason why Python is called as an interpreted language.
26Q. What happens when a function doesn’t have a return statement? Is this valid?
Ans: Yes, this is valid. The function will then return a None object. The end of a function is defined by the block of code is executed (i.e., the indenting) not by any explicit keyword.
27Q. Define package in Python?
Ans: In Python packages are defined as the collection of different modules.
28Q. How can we make a Python script executable on Unix?
Ans: In order to make a Python script executable on Unix, we need to perform two things. They are:
Script file mode must be executable and
The first line should always begin with #.
29Q. Which command is used to delete files in Python?
Ans: OS.unlink(filename) or OS.remove(filename) are the commands used to delete files in Python Programming.
30Q. Define pickling and unpickling in Python?
Pickling in Python: The process in which the pickle module accepts various Python objects and converts into a string representation and dumps the file accordingly using dump function is called pickling.
Unpickling in Python: The process of retrieving actual Python objects from the stored string representation is called unpickling