Programming Articles - Page 2386 of 3366

Google Colaboratory is a free Jupyter notebook environment that requires no setup and runs entirely in the cloud. It is hosted in google cloud and maintained by Google for the benefit of python coders who want to run and test python scripts using a cloud environment. In this article, we will see how to set up and run a google collaboratory cloud environment.Opening the Python NotebookWe navigate to this google link (https://colab.research.google.com/). It opens up the below screen. We choose the option NEW PYTHON3 NOTEBOOK from the bottom right corner as shown in the diagram below.Python CodeOptionsOn clicking the NEW ... Read More

Dictionaries in python are a type of data structure that map keys to values as a key-value pair. They are one of the frequently used data structures and have many interesting properties. They are presented by enclosing them in a pair of curly brace like below.dict = {'day1':'Mon' ,'day2':'Tue', 'day3':'Wed'}The elements or key-value pairs in the dictionary are represented within single quotes and separated by a colon.Creating a DictionaryWe create a dictionary by assigning values written in the form of a key.ExampleDict1 = {'day1':'Mon' ,'day2':'Tue', 'day3':'Wed'} print(type(dict1)) print(dict1) # Using the dict() method dict2 =dict({('day1', 'Mon'), ('day2', 'Tue'), ('day3', ... Read More

Heap queue is a special tree structure in which each parent node is less than or equal to its child node.In pythin it is implemented using the heapq module. It is very useful is implementing priority queues where the queue item with higher weightage is given more priority in processing. TheCreate a HeapA heap queue is created by using python’s inbuilt library named heapq. This library has the relevant functions to carry out various operations on heap data structure. Below is a list of these functions.heapify − This function converts a regular list to a heap. In the resulting heap ... Read More

Get MongoDBTo install MongoDB on Windows, first, download the latest release of MongoDB from https://www.mongodb.org/downloads. Below is an example of selecting a 64-bit version for windows as a msi installer.Install MongoDBNext, we follow the below steps to install MongoDB. As it is a windows installation using the msi installer, the steps are very straight forward. We choose a complete installation instead of a custom installation.Running the installerHere we run the installer which has been downloaded to our system. The installation starts asking for various steps of confirmation.Choosing a Service ConfigurationWe choose to run the service as a network service user. Clicking ... Read More

Python has the ability to create graphs by using the matplotlib library. It has numerous packages and functions which generate a wide variety of graphs and plots. It is also very simple to use. It along with numpy and other python built-in functions achieves the goal. In this article we will see some of the different kinds of graphs it can generate.Simple GraphsHere we take a mathematical function to generate the x and Y coordinates of the graph. Then we use matplotlib to plot the graph for that function. Here we can apply labels and show the title of the ... Read More

Different variables in a python program have different scope. Depending on where it is declared, the variable may or may not be accessible inside a function. Sometimes we will need to modify a variable that is present inside a function from outside its current scope. In such a scenario we use the global keyword with the variable name.Following are the key points about the global keywordA variable declared outside a function is a global variable by default.We use a global keyword for a variable which is inside a function so that it can be modified.Without the global keyword, the variable ... Read More

When you create some python programs that need password protection before it can run, we take the help of the getpass() and getuser() modules. They have a variety of functionalities that can be used to manage password protection as well as password retrieval etc. In this article, we will see how to type in the password with and without echoing it back on the screen. Below are the different ways it is handled.With PromptThe below code is saved to a file (logon.py). The getpass() function prints a prompt then reads input from the user until they press returnExample Live Demoimport getpass ... Read More

File Searching in Python can be done using various methods, like using the os module with os.walk() function as it takes a specific path as input and generates a 3-tuple involving dirpath, dirnames, and filenames. Another method is using the pathlib module which provides an object-oriented interface while working on file systems paths. In Python there are some widely used methods to search for specific files, some of them are as follows - Os Module: This module allows us to interact with the operating system. ... Read More

Dictionaries in python are a type of data structure that map keys to values as a key-value pair. They are one of the frequently used data structures and have many interesting properties. They are presented by enclosing them in a pair of curly brace like below.dict = {'day1':'Mon' ,'day2':'Tue', 'day3':'Wed'}The elements or key-value pairs in the dictionary are represented within single quotes and separated by a colon.Creating a DictionaryWe create a dictionary by assigning values written in the form of a ke.ExampleDict1 = {'day1':'Mon' ,'day2':'Tue', 'day3':'Wed'} print(type(dict1)) print(dict1) # Using the dict() method dict2 =dict({('day1', 'Mon'), ('day2', 'Tue'), ('day3', ... Read More

When using the iterators, we need to keep track of the number of items in the iterator. This is achieved by an in-built method called enumerate(). The enumerate() method adds counter to the iterable. The returned object is a enumerate object. Its syntax and parameters are described below.enumerate(iterable, start=0) iterable - a sequence, an iterator, or objects that supports iteration start – is the position in the iterator from where the counting starts. Default is 0.ExampleIn the below example we take a dictionary and apply enumerate to it. In the result the default start is from 0 and we get ... Read More