Xoriant
20+ Molex Interview Questions and Answers
Q1. Tell me some of the data types that are used in python?
Python has several data types including integers, floats, strings, booleans, lists, tuples, dictionaries, and sets.
Integers represent whole numbers, e.g. 5, -10.
Floats represent decimal numbers, e.g. 3.14, -2.5.
Strings represent sequences of characters, e.g. 'hello', 'Python'.
Booleans represent either True or False.
Lists are ordered collections of items, e.g. [1, 2, 3].
Tuples are similar to lists but immutable, e.g. (1, 2, 3).
Dictionaries are key-value pairs, e.g. {'name': 'J...read more
Q2. What are joins in SQL? Explain each with the real life example?
Joins in SQL are used to combine data from two or more tables based on a related column.
Inner join returns only the matching rows from both tables.
Left join returns all the rows from the left table and matching rows from the right table.
Right join returns all the rows from the right table and matching rows from the left table.
Full outer join returns all the rows from both tables.
Example: Inner join can be used to combine customer and order tables based on customer ID.
Q3. How will you delete a file in python module using a python code?
To delete a file in Python module, use the os module's remove() method.
Import the os module
Use the remove() method to delete the file
Specify the file path in the remove() method
Example: import os; os.remove('file.txt')
Q4. Do python has any destructor? If yes then what is that destructor?
Yes, Python has a destructor called __del__().
The __del__() method is called when an object is about to be destroyed.
It is used to perform cleanup operations before the object is destroyed.
The __del__() method is not guaranteed to be called, so it should not be relied upon for critical cleanup operations.
Q5. & finally what is indexs in SQL? What are there types?
Indexes in SQL are used to improve query performance by allowing faster data retrieval.
Indexes are data structures that store a small portion of the table data in an easily searchable format.
Types of indexes include clustered, non-clustered, unique, and full-text indexes.
Clustered indexes determine the physical order of data in a table, while non-clustered indexes create a separate structure for faster searching.
Unique indexes ensure that no two rows in a table have the same ...read more
Q6. What is the difference between python & other programming languages?
Python is a high-level, interpreted programming language known for its simplicity, readability, and ease of use.
Python is dynamically typed, meaning that variable types are determined at runtime.
Python has a large standard library and a vast collection of third-party libraries.
Python is often used for web development, scientific computing, data analysis, and artificial intelligence.
Python code is typically shorter and more concise than code in other languages.
Python is slower...read more
Q7. What are the front end technologies you know?
I am familiar with HTML, CSS, and JavaScript for front-end development.
HTML
CSS
JavaScript
Q8. What is the difference between variable and literal?
Variables are containers that store values while literals are values themselves.
Variables can be changed while literals cannot
Variables can be assigned to literals
Literals are used to represent fixed values
Variables are used to represent changing values
Q9. What are the building blocks of object oriented programming?
The building blocks of object oriented programming are classes, objects, inheritance, encapsulation, and polymorphism.
Classes are templates for creating objects
Objects are instances of classes
Inheritance allows classes to inherit properties and methods from parent classes
Encapsulation is the practice of hiding implementation details from users
Polymorphism allows objects to take on multiple forms
Q10. What is operator overloading & function overloading?
Operator overloading is the ability to redefine operators for user-defined types. Function overloading is the ability to define multiple functions with the same name but different parameters.
Operator overloading allows user-defined types to use operators such as +, -, *, /, etc.
Function overloading allows multiple functions to have the same name but different parameters.
Operator overloading and function overloading both provide a way to make code more readable and intuitive.
E...read more
Q11. What is pass by value & pass by reference?
Pass by value copies the value of a variable, while pass by reference copies the address of the variable.
Pass by value creates a new copy of the variable, while pass by reference uses the original variable.
Pass by value is used for primitive data types, while pass by reference is used for objects and arrays.
Pass by value is faster and safer, while pass by reference allows for more efficient memory usage.
Pass by value can lead to unexpected results when modifying the copied va...read more
Q12. How many types of values are there in python?
Python has five standard data types: Numbers, Strings, Lists, Tuples, and Dictionaries.
Numbers include integers, floating-point numbers, and complex numbers.
Strings are sequences of Unicode characters.
Lists are ordered sequences of values.
Tuples are ordered, immutable sequences of values.
Dictionaries are unordered collections of key-value pairs.
Q13. Tell something about init() method in python?
init() method is a constructor method in Python that is called when an object is created.
It initializes the attributes of the object.
It takes self as the first parameter.
It can be used to perform any setup required before the object is used.
It can be overridden to customize the initialization process.
Example: def __init__(self, name, age): self.name = name self.age = age
Q14. What is global & local variable in python?
Global variables are accessible throughout the program, while local variables are only accessible within a specific function.
Global variables are declared outside of any function and can be accessed from any part of the program.
Local variables are declared within a function and can only be accessed within that function.
If a local variable has the same name as a global variable, the local variable takes precedence within the function.
Global variables can be modified from withi...read more
Q15. Which constructors are used in python?
Python has two types of constructors - default and parameterized constructors.
Default constructor has no parameters and is automatically called when an object is created.
Parameterized constructor takes parameters and is used to initialize the object's attributes.
Example of default constructor: def __init__(self):
Example of parameterized constructor: def __init__(self, name, age):
Q16. How is memory managed in python?
Python uses automatic memory management through garbage collection.
Python uses reference counting to keep track of memory usage.
Objects with no references are automatically deleted by the garbage collector.
Python also has a built-in module called 'gc' for manual garbage collection.
Memory leaks can occur if circular references are not handled properly.
Q17. What is the split & join method?
Split method splits a string into an array of substrings based on a specified separator. Join method joins the elements of an array into a string.
Split method returns an array of strings.
Join method concatenates the elements of an array into a string.
Both methods are used to manipulate strings in JavaScript.
Example: var str = 'apple,banana,orange'; var arr = str.split(','); var newStr = arr.join('-');
Output: arr = ['apple', 'banana', 'orange'], newStr = 'apple-banana-orange'
Q18. What are python Modules?
Python modules are files containing Python code that can be imported and used in other Python programs.
Modules are used to organize code into reusable and maintainable structures.
Python has a large standard library of modules that can be imported and used.
Third-party modules can also be installed and used in Python programs.
Modules can define functions, classes, and variables that can be accessed by other modules.
Modules can be imported using the 'import' statement in Python.
Q19. What are python generators?
Python generators are functions that return an iterator and generate values on the fly.
Generators use the 'yield' keyword to return values one at a time.
They can be used to generate an infinite sequence of values.
Generators are memory efficient as they generate values on the fly instead of storing them in memory.
Example: def my_generator(): yield 1; yield 2; yield 3;
Example: for num in my_generator(): print(num)
Q20. Why do you prefer python?
Python is a versatile language with a simple syntax and a vast library of modules.
Easy to learn and read
Supports multiple programming paradigms
Large community and extensive documentation
Suitable for various applications such as web development, data analysis, and machine learning
Q21. What is slicing in Python?
Slicing is a way to extract a portion of a sequence (string, list, tuple) in Python.
Slicing is done using the colon (:) operator.
The syntax for slicing is [start:stop:step].
start is the index where the slice starts (inclusive), stop is the index where the slice ends (exclusive), and step is the size of the jump between indices.
If start or stop is not specified, it defaults to the beginning or end of the sequence.
If step is not specified, it defaults to 1.
Slicing can be used o...read more
Q22. What are python iterators?
Python iterators are objects that allow iteration over a collection of elements.
Iterators are used to loop through a collection of elements, one at a time.
They implement the __iter__() and __next__() methods.
The __iter__() method returns the iterator object and the __next__() method returns the next element in the sequence.
Iterators can be created using iter() function or by defining a class that implements the required methods.
Examples of built-in iterators in Python include...read more
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