eClerx Python Latest Interview Questions Answers

How Do I Share Global Variables Across Modules?

The canonical way to share information across modules within a single program is to create a special module (often called config or cfg). Just import the config module in all modules of your application; the module then becomes available as a global name. Because there is only one instance of each module, any changes made to the module object get reflected everywhere.

For example:

config.py:

x = 0 # Default value of the 'x' configuration setting
mod.py:
import config
config.x = 1
main.py:
import config
import mod
print config.x

eClerx Most Frequently Asked Python Latest Interview Questions Answers

How Do I Copy An Object In Python?

In general, try copy.copy() or copy.deepcopy() for the general case. Not all objects can be copied, but most can.
Some objects can be copied more easily. Dictionaries have a copy() method:
newdict = olddict.copy()
Sequences can be copied by slicing:
new_l = l[:]

What Are The Built-In Types Available In Python?

Here is the list of most commonly used built-in types that Python supports:

Immutable built-in types of Python

Numbers
Strings
Tuples

Mutable built-in types of Python

List
Dictionaries
Sets

How To Find Bugs Or Perform Static Analysis In A Python Application?

You can use PyChecker, which is a static analyzer. It identifies the bugs in Python project and also reveals the style and complexity related bugs.
Another tool is Pylint, which checks whether the Python module satisfies the coding standard.

When Is The Python Decorator Used?

Python decorator is a relative change that you do in Python syntax to adjust the functions quickly.

 What Is The Key Difference Between A List And The Tuple?

List Vs Tuple.
The major difference between a list and the tuple is that the list is mutable while tuple is not. A tuple is allowed to be hashed, for example, using it as a key for dictionaries.

 How Does Python Handle The Memory Management?

Python uses private heaps to maintain its memory. So the heap holds all the Python objects and the data structures. This area is only accessible to the Python interpreter; programmers can’t use it.
And it’s the Python memory manager that handles the Private heap. It does the required allocation of the heap for Python objects.
Python employs a built-in garbage collector, which salvages all the unused memory and offloads it to the heap space.

What Are The Principal Differences Between The Lambda And Def?

Lambda Vs Def.
def can hold multiple expressions while lambda is a uni-expression function.
def generates a function and designates a name so as to call it later. lambda forms a function and returns the function itself.
def can have a return statement. lambda can’t have return statements
lambda supports to get used inside a list and dictionary.

Write A Reg Expression That Confirms An Email Id Using The Python Reg Expression Module <Re>?

Python has a regular expression module <re>.

Check out the <re> expression that can check the email id for .com and .co.in subdomain.

import re
print(re.search(r"[0-9a-zA-Z.]+@[a-zA-Z]+\.(com|co\.in)$","micheal.pages@mp.com"))


What Do You Think Is The Output Of The Following Code Fragment? Is There Any Error In The Code?

list = ['a', 'b', 'c', 'd', 'e']
print (list[10:])
The result of the above lines of code is []. There won’t be any error like an IndexError.

You should know that trying to fetch a member from the list using an index that exceeds the member count (for example, attempting to access list[10] as given in the question) would yield an IndexError. By the way, retrieving only a slice at an opening index that surpasses the no. of items in the list won’t result in an IndexError. It will just return an empty list.

Is There A Switch Or Case Statement In Python? If Not Then What Is The Reason For The Same?

No, Python does not have a Switch statement, but you can write a Switch function and then use it.

What Is A Built-In Function That Python Uses To Iterate Over A Number Sequence?

range() generates a list of numbers, which is used to iterate over for loops.

for i in range(5):
    print(i)

The range() function accompanies two sets of parameters.

range(stop)

stop: It is the no. of integers to generate and starts from zero. eg. range(3) == [0, 1, 2].

range([start], stop[, step])

start: It is the starting no. of the sequence.
stop: It specifies the upper limit of the sequence.
step: It is the incrementing factor for generating the sequence.

Points to note:

Only integer arguments are allowed.
Parameters can be positive or negative.
The <range()> function in Python starts from the zeroth index.

What is tuples in Python?

A tuple is another sequence data type that is similar to the list. A tuple consists of a number of values separated by commas. Unlike lists, however, tuples are enclosed within parentheses.

What is the difference between tuples and lists in Python?

The main differences between lists and tuples are − Lists are enclosed in brackets ( [ ] ) and their elements and size can be changed, while tuples are enclosed in parentheses ( ( ) ) and cannot be updated. Tuples can be thought of as read-only lists.

What is the output of print tuple if tuple = ( ‘abcd’, 786 , 2.23, ‘john’, 70.2 )?

It will print complete tuple. Output would be (‘abcd’, 786, 2.23, ‘john’, 70.200000000000003).

What is the output of print tuple[0] if tuple = ( ‘abcd’, 786 , 2.23, ‘john’, 70.2 )?

It will print first element of the tuple. Output would be abcd.

Name some of the features of Python.

Following are some of the salient features of python

It supports functional and structured programming methods as well as OOP.
It can be used as a scripting language or can be compiled to byte-code for building large applications.
It provides very high-level dynamic data types and supports dynamic type checking.
It supports automatic garbage collection.
It can be easily integrated with C, C++, COM, ActiveX, CORBA, and Java.

Do you have any personal projects?
Really?

This shows that you are willing to do more than the bare minimum in terms of keeping your skillset up to date. If you work on personal projects and code outside of the workplace then employers are more likely to see you as an asset that will grow. Even if they don’t ask this question I find it’s useful to broach the subject.