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Articles by Pradeep Elance
Page 29 of 31
Sort a list according to the Length of the Elements in Python program
We have a list of strings and our goal is to sort the list based on the length of strings in the list. We have to arrange the strings in ascending order according to their lengths. We can do this using our algorithms or Python built-in method sort() or function sorted() along with a key.Let's take an example to see the output.Input: strings = ["hafeez", "aslan", "honey", "appi"] Output: ["appi", "aslan", "honey", "hafeez"]Let's write our program using sort(key) and sorted(key). Follow the below steps to achieve the desired output using a sorted(key) function.Algorithm1. Initialize the list of strings. 2. Sort ...
Read MoreReverse words in a given String in Python
We are given a string, and our goal is to reverse all the words which are present in the string. We can use the split method and reversed function to achieve the output. Let's see some sample test cases.Input: string = "I am a python programmer" Output: programmer python a am IInput: string = "tutorialspoint is a educational website" Output: website educational a is tutorialspointLet's follow the below steps to achieve our goal.Algorithm1. Initialize the string. 2. Split the string on space and store the resultant list in a variable called words. 3. Reverse the list words using reversed function. ...
Read MoreHow to run Python code on Google Colaboratory?
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 Moregetpass() and getuser() in Python (Password without echo)
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 MoreFew mistakes when using Python dictionary
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 MoreDatagram in Python
Chunks of data move between the clients and servers using the User Datagram Protocol or UDP protocol. The two communicating endpoints need the IP address and port number to establish communication. One endpoint is known as the sender and the other is known as the receiver. In this protocol, the sender does not keep track of the sent packets and it is up to the receiver to accept or not all the packets.Sender ProgramThe below python program uses the socket module to create the sender’s program. We declare variables for IP address and Port. Then add a message to it. ...
Read Morecolorsys module in Python
This module allows bidirectional conversions of color values between colors expressed in the RGB (Red Green Blue) and other color spaces. The three other color spaces it uses are YIQ (Luminance (Y) In-phase Quadrature), HLS (Hue Lightness Saturation) and HSV (Hue Saturation Value). All the coordinates can be between 0 and 1 except the I and Q values in the YIQ color space.The below tables shows the functions and their purpose.FunctionPurposePermitted Valuesrgb_to_yiqfrom RGB coordinates to YIQ coordinates0 to 1rgb_to_hlsfrom RGB coordinates to HLS coordinates0 to 1rgb_to_hsvfrom RGB coordinates to HSV coordinates0 to 1yiq_to_rgbfrom YIQ coordinates to RGB coordinates-1 to 1hls_to_rgbfrom ...
Read MoreFilter in Python
We sometimes arrive at a situation where we have two lists and we want to check whether each item from the smaller list is present in the bigger list or not. In such case we use the filter() function as discussed below.SyntaxFilter(function_name, sequence name)Here Function_name is the name of the function which has the filter criteria. Sequence name is the sequence which has elements that needs to be filtered. It can be sets, lists, tuples, or other iterators.ExampleIn the below example we take a bigger list of some month names and then filter out those months which does not have ...
Read MoreChange Data Type for one or more columns in Pandas Dataframe
Many times we may need to convert the data types of one or more columns in a pandas data frame to accommodate certain needs of calculations. There are some in-built functions or methods available in pandas which can achieve this.Using astype()The astype() method we can impose a new data type to an existing column or all columns of a pandas data frame. In the below example we convert all the existing columns to string data type.Example Live Demoimport pandas as pd #Sample dataframe df = pd.DataFrame({ 'DayNo': [1, 2, 3, 4, 5, 6, 7], 'Name': ['Sun', 'Mon', 'Tue', 'Wed', ...
Read MoreCalculate n + nn + nnn + ? + n(m times) in Python
There are a variety of mathematical series which python can handle gracefully. One such series is a series of repeated digits. Here we take a digit and add it to the next number which has two such digits and again the next number is three such digits and so on. Finally, we calculate the sum of all such numbers in the series.ApproachWe take a digit and convert it to string. Then concatenate two such strings to get the double digit number and keep concatenating to get higher numbers of such digits. Then we implement a recursive function to add all ...
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