50+ Python Interview Questions To Secure A Job With - Algrim.co

50+ Python Interview Questions To Secure A Job With - Algrim.co or by calling the dictionary function. • Objects in the dictionary are mutable • Dictionary represents a key value base • Each of the key-value pairs in a Dictionary is known as an item. • Keys in a dictionary must be immutable. • In a Dictionary, values can be duplicated but duplicate keys are not allowed. • Insertion order is not preserved. • Dictionary allows both heterogeneous keys and values. 42. What are packages in Python? A package in Python is nothing else but a dictionary or folder that represents a collection of modules. A package can also contain sub-packages. In a Python application; • It is possible to import the modules of the package by using package name.module name • It is also possible to import the modules of the package by using package name.subpackage name.module name 43. What is file handling in Python? • A file in python can be described as the location within a disc where data is stored in a permanent manner. • Python as a scripting language has several functions and methods that provide communication between Python programs and other files. • Python programs can open, read and close the file whenever necessary. The opening of files in a Python application is done by calling open functions of built-in modules. When opening a file, the users have to specify the mode of the file. The mode of the file indicates the purpose for which the purpose is going to be used for once opened. 44. What are Runtime Errors in a Python setup? Runtime errors occur once the execution of programs is started. Runtime errors often occur because of the following reasons. • Invalid Input • Invalid Logic • Memory issues • Hardware failures and so on 45. What is Abnormal Termination is a Python configuration Just as the name suggests, abnormal termination refers to the act of terminating programs while it is in the middle of its execution and the last statement of the main module has not been executed yet. In programming languages, an abnormal termination is an undesirable situation that could cause minor internal malfunctions. 46. What are the main differences between Methods and Constructors in Python? • Methods are executed whenever they are called whereas Constructors are executed automatically whenever the object is created. • One method can be called for ‘n’ members of lines whereas one constructor can only be executed once. • Methods are used to represent business logic when performing their operations while constructors are used to define and initialize the non-static variable. 47. What is Garbage Collection in Python? Garbage collection refers to the concept of removing unused and unreferenced objects from the memory collection. Some of the key features of the concept include; • Once garbage collection is executed, more space is made available for both the program and the execution of other programs become faster. • The garbage collector is a predefined program that removes unused and unreferenced objects in a Python framework. • Unused or unreferenced objects are those count is zero. • The numbers of reference variables pointing to a specific object are also known as the reference count of the object. • In simple terms, the garbage collection process begins during the execution of a python program. If any of the objects reference counts is zero, the Python interpreter calls the garbage collector to remove the object from the memory location. 48. What are DML commands used for in Python programs? • DML commands are commands used to modify data in database objects. • Whenever the DML commands are executed, the records are modified temporarily. • Whenever the roll-back command is run, the modified records are supposed to go back to their original state. • In order to permanently modify the records of a database, the “commit” command is used. • After the execution of the commit command even after the rollback command has been executed, the modified records will not return to their original state. • When the DML commands are run through a Python program, the number of records that will be modified as a result of that command is stored into the row count attribute of the cursor object. 9. What Are Applications of Python? Applications of Python Applications of Python and JAVA.NET Automation App: PYTHON (NO) JAVA.NET (NO) Data Analytics: PYTHON (NO) JAVA.NET (NO) Scientific App: PYTHON (NO) JAVA.NET (NO) Web App: PYTHON (YES) JAVA.NET (YES) Web Scrapping: PYTHON (NO) JAVA.NET (NO) Test Cases: PYTHON (YES) JAVA.NET (YES) Network with JOT: PYTHON (YES) JAVA.NET (NO) Admin Script: PYTHON (NO) JAVA.NET (NO) GUI: PYTHON (YES) JAVA.NET (YES) Gaming: PYTHON (YES) JAVA.NET (YES) Animation: PYTHON (NO) JAVA.NET (NO) 50. What is multithreading in a Python program? Multithreading is logic or functionality in Python that can execute simultaneously along with other programs. Some of the key features of multithreading include; • Multithreading is a relatively lightweight process • Any program that is being executed during multithreading is referred to as a process. • Threads in Python can be defined by overwriting run method or the thread class. • The thread class refers to a predefined class that is defined in a threading module. • The thread module is a predefined module. 51. What is NumPy and how is it better than the list in Python? NumPy is a Python package that is used for scientific computing and deals with larger data sizes. NumPy has a powerful N-dimensional array object as well as a set of advanced functions. This means that it is better than the inbuilt list in Python because of the following reasons; • NumPy arrays are more compact than lists. • Reading and writing items is faster with NumPy. • Using NumPy is more convenient than using the standard list. • NumPy arrays are more efficient as they augment the functionality of lists in Python. Core benefits of using python When a future employer asks you why you might use python versus another programming language, your answer should be its ability to be very focused on a single task and be incredibly lightweight. Python is often used in quantitative trading systems because it has the ability to execute its logic extremely quickly. Its entire package is also extremely lightweight, meaning it can be moved and executed between servers and locations quite easily. This is one of the main advantages to the programming language compared to others. It is still widely used by those looking to develop applications for the web, but its losing popularity to other languages that have more opensource software available.