Python Programming(Interview Questions) Learn TechToTech; 19 videos; 847 views; Updated today; Play all Share. Python is a general purpose language meaning that it can be used for anything including data science, machine learning, automation, learning, scientific, mathematical, etc. To reverse a string using slicing, write: Or write without specifying the length of the string: The slice statement means start at string length, end at position 0, move with the step -1 (or one step backward). The first code snippet below shows a simple dictionary and how when a key that does not exist in the dict is accessed, it gives an error. Moreover, since binary search takes O(logn) time for finding a single element, therefore a binary search for all n elements will take O(nlogn) time. Since arrays stay the size that they were when they were first initialized, they are compact. Sign in to YouTube. It creates the values as you need them with a special technique called yielding. Then for each element in the list, use a binary search to look for the difference between that element and the intended sum. Sign in. Arrays are special variables and are used to store multiple values in one single variable, at continuous memory locations, thus making it easier to calculate the position of each element just by adding an offset to a base value. The minHeapify() function takes O(log(n)) time and its called on n2\frac{n}{2}​2​​n​​ When this error occurs, the program will stop and generate an exception which then gets handled in order to prevent the program from crashing. Variables declared outside a function or in global space are called global variables. The following Python section contains a wide collection of Python programming examples. Questions are unordered. Editors' Picks Features Explore Contribute. We will do this using queue.enqueue(stack.pop()) in line 12. On the other hand, the second print statement prints False because none of the elements are True, i.e., all elements are False. If it does, the method returns the starting index of a substring within the string; otherwise, it returns -1. 55 Python Interview Questions (With Example Answers) Many computer programming careers require the employee to be fluent in one or more programming languages. The variables can be of any type (arrays, dictionaries, objects, etc.). Java is also another programming language, but with a distinct advantage compared to other programming languages. When we use the = operator, we are not cloning the object; instead, we reference our variable to the same object (a.k.a. Here we’ll be using numpy.array(). For some perspective, some of the largest companies that use Django are Instagram, Dropbox, Pinterest, and Spotify. Its importance lies in the fact that it allows each new key to be given a default value based on the type of dictionary being created. For example, you can expect the questions related to keywords, architecture, ORM, frameworks, how to solve a particular scenario, how to write a code or what is the output of the program, etc. First, we need to know how to retrieve data from a dictionary to be passed on to this function. The @property is a decorator. The join method in Python is a string method, which connects elements of a string iterable structure, which also contains strings or characters (array, list, etc.) It is an environment variable, which is used when a module is imported. This means that changing one variable’s value affects the other variable’s value because they are referring (or pointing) to the same object. Do go through the questions and answers and become a professional. Time Complexity We use cookies to ensure you get the best experience on our website. NumPy array is faster and You get a lot built in with NumPy, FFTs, convolutions, fast searching, basic statistics, linear algebra, histograms, etc. Following are a few of the default modules available in Python. Here is the code for merge sort in Python: This is the recursive approach for implementing merge sort. Our decision simply depends on two questions: Here we will choose roll numbers as key and names as the value because roll numbers are unique and names could be repetitive. Master Algorithms with Python for Coding Interviews, Python Concurrency: Making sense of asyncio, Stop Using Excel for Data Analytics: Upgrade to Python, A list consists of mutable objects. Python is an interpreted language that means the code does not have to be compiled before use. We need to maintain the order of update for each key in a tuple value. Since lists provide users with easier accessibility, they should be used whenever similar types of objects need to be stored. Lists consume more memory as they are allocated a few extra elements to allow for quicker appending of items.

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