Python Interview Question & Answers
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1)What is Python? What are the benefits of using Python?
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 an open source.
2)What is PEP 8?
PEP 8 is a coding convention, a set of recommendation, about how to write your Python code more readable.
3)What is pickling and unpickling?
Pickle module accepts any Python object and converts it into a string representation and dumps it into a file by using dump function, this process is called pickling. While the process of retrieving original Python objects from the stored string representation is called unpickling.
4) What are the tools that help to find bugs or perform static analysis?
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.
5)What are Python decorators?
A Python decorator is a specific change that we make in Python syntax to alter functions easily.
6)What is the difference between list and tuple?
The difference between list and tuple is that list is mutable while tuple is not. Tuple can be hashed for e.g as a key for dictionaries.
7) What is Dict and List comprehensions are?
They are syntax constructions to ease the creation of a Dictionary or List based on existing iterable.
8)What are the built-in type does python provides?
There are mutable and Immutable types of Pythons built in types Mutable built-in types
List
Sets
Dictionaries
Immutable built-in types
Strings
Tuples
Numbers
9)What is namespace in Python?
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 corresponding object.
10)What is lambda in Python?
It is a single expression anonymous function often used as inline function.
11)Why lambda forms in python does not have statements?
A lambda form in python does not have statements as it is used to make new function object and then return them at runtime.
12)In Python what are iterators?
In Python, iterators are used to iterate a group of elements, containers like list.
13)What is negative index in Python?
Python sequences can be 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.
14) How you can convert a number to a string?
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().
15)What is the difference between Xrange and range?
Xrange returns the xrange object while range returns the list, and uses the same memory and no matter what the range size is.
16) How can you share global variables across modules?
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.
17)Explain how can you make a Python Script executable on Unix?
To make a Python Script executable on Unix, you need to do two things,
Script file’s mode must be executable and
the first line must begin with # ( #!/usr/local/bin/python)
18)Mention the use of // operator in Python?
It is a Floor Divisionoperator , 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.
19) Mention the use of the split function in Python?
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.
20)Explain what is the common way for the Flask script to work?
The common way for the flask script to work is
Either it should be the import path for your application
Or the path to a Python file
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