We have 45+ questions on Python Programming basics which will help you with different expertise levels to reap the maximum benefit from our blog. Our Python Interview Questions is the one-stop resource from where you can boost your interview preparation.
Table of Contents
Ans: Python is a programming language with objects, modules, threads, exceptions and automatic memory management. The benefits of pythons are that it is simple and easy, portable, extensible, build-in data structure and it is open-source.
Ans: PEP 8 is a coding convention, a set of recommendations, about how to write your Python code more readable.
Ans: Pickle module accepts any Python object and converts it into a string representation and dumps it into a file by using the dump function, this process is called pickling. While the process of retrieving original Python objects from the stored string representation is called unpickling.
Ans: Python language is an interpreted language. Python program runs directly from the source code. It converts the source code that is written by the programmer into an intermediate language, which is again translated into machine language that has to be executed.
Ans: PyChecker is a static analysis tool that detects the bugs in Python source code and warns about the style and complexity of the bug. Pylint is another tool that verifies whether the module meets the coding standard.
Ans: A Python decorator is a specific change that we make in Python syntax to alter functions easily.
Ans: The difference between list and tuple is that the list is mutable while tuple is not. Tuple can be hashed for e.g. as a key for dictionaries.
Ans: Everything in Python is an object and all variables hold references to the objects. The reference values are according to the functions; as a result, you cannot change the value of the references. However, you can change the objects if it is mutable.
Ans: They are syntax constructions to ease the creation of a Dictionary or List based on existing iterable.
Ans: In Python, iterators are used to iterate a group of elements, containers like the list.
Ans: A unit testing framework in Python is known as unit test. It supports the sharing of setups, automation testing, shutdown code for tests, aggregation of tests into collections, etc.
Ans: A mechanism to select a range of items from sequence types like list, tuple, strings etc. is known as slicing.
Ans: The way of implementing iterators are known as generators. It is a normal function except that it yields expression in the function.
Ans: A Python documentation string is known as docstring, it is a way of documenting Python functions, modules and classes.
Ans: There are mutable and Immutable types of Pythons built-in types Mutable built-in types
Immutable built-in types
Ans: In Python, every name introduced has a place where it lives and can be hooked for. This is known as namespace. It is like a box where a variable name is mapped to the object placed. Whenever the variable is searched out, this box will be searched, to get the corresponding object.
Ans: It is a single expression anonymous function often used as inline function.
Ans: A lambda form in python does not have statements as it is used to make new function object and then return them at runtime.
Ans: Pass means, no-operation Python statement, or in other words it is a place holder in compound statement, where there should be a blank left and nothing has to be written there.
Ans: In Python, module is the way to structure program. Each Python program file is a module, which imports other modules like objects and attributes.
The folder of Python program is a package of modules. A package can have modules or subfolders.
Ans: Local variables: If a variable is assigned a new value anywhere within the function’s body, it’s assumed to be local.
Global variables: Those variables that are only referenced inside a function are implicitly global.
Ans: To share global variables across modules within a single program, create a special module. Import the config module in all modules of your application. The module will be available as a global variable across modules.
Ans: To make a Python Script executable on Unix, you need to do two things,
Ans: By using a command os.remove (filename) or os.unlink(filename)
Ans: To generate random numbers in Python, you need to import command as
import random
random.random()
This returns a random floating-point number in the range [0,1)
Ans: To copy an object in Python, you can try copy. Copy () or copy.deepcopy() for the general case. You cannot copy all objects but most of them.
Ans: Python sequences can be an index in positive and negative numbers. For positive index, 0 is the first index, 1 is the second index and so forth. For negative index, (-1) is the last index and (-2) is the second last index and so forth.
Ans: In order to convert a number into a string, use the inbuilt function str(). If you want a octal or hexadecimal representation, use the inbuilt function oct() or hex().
Ans: Xrange returns the xrange object while range returns the list, and uses the same memory and no matter what the range size is.
Ans: You can access a module written in Python from C by following method,
Module = =PyImport_ImportModule(“<modulename>”);
Ans: It is a Floor Division operator , which is used for dividing two operands with the result as quotient showing only digits before the decimal point. For instance, 10//5 = 2 and 10.0//5.0 = 2.0.
Ans: Flask is a web micro framework for Python based on “Werkzeug, Jinja 2 and good intentions” BSD licensed. Werkzeug and jingja are two of its dependencies.
Flask is part of the micro-framework. Which means it will have little to no dependencies on external libraries. It makes the framework light while there is little dependency to update and less security bugs.
Ans: Flask is a “microframework” primarily build for a small application with simpler requirements. In flask, you have to use external libraries. Flask is ready to use.
Pyramid is built for larger applications. It provides flexibility and lets the developer use the right tools for their project. The developer can choose the database, URL structure, templating style and more. Pyramid is heavy configurable.
Like Pyramid, Django can also be used for larger applications. It includes an ORM.
Ans: Flask-WTF offers simple integration with WTForms. Features include for Flask WTF are
Ans: The common way for the flask script to work is
Ans: The use of the split function in Python is that it breaks a string into shorter strings using the defined separator. It gives a list of all words present in the string.
Ans: A session basically allows you to remember information from one request to another. In a flask, it uses a signed cookie so the user can look at the session contents and modify. The user can modify the session if only it has the secret key Flask.secret_key.
Ans: Flask supports database powered application (RDBS). Such system requires creating a schema, which requires piping the shema.sql file into a sqlite3 command. So you need to install sqlite3 command in order to create or initiate the database in Flask.
Flask allows to request a database in three ways
Ans: The data in the failed server won’t get removed, but there is a provision for auto-failure, which you can configure for multiple nodes. Fail-over can be triggered during any kind of socket or Memcached server level errors and not during normal client errors like adding an existing key, etc.
Ans: Dogpile effect is referred to the event when cache expires, and websites are hit by the multiple requests made by the client at the same time. This effect can be prevented by using semaphore lock. In this system when value expires, first process acquires the lock and starts generating new value.
Ans: Built-in types in Python are as follows –
Ans: Python packages are namespaces containing multiple modules.
Ans: To delete a file in Python, you need to import the OS Module. After that, you need to use the os.remove() function.
Example:
1 2 | import os os.remove(“xyz.txt”) |
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