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Articles by Pradeep Elance
Page 7 of 31
Python to create a digital clock using Tkinter
Python Tkinter can be used to create all kinds of GUI programs for the web and desktop. In this article we will see how to create a digital clock displaying hour, minute and seconds live.We use the time module to import the method strftime which displays the time in Hour, minute and seconds format. We create a canvas to hold these values. We refresh the values of strftime after every 200 milli seconds. We define a recursive function to achieve this.Exampleimport time from tkinter import * canvas = Tk() canvas.title("Digital Clock") canvas.geometry("350x200") canvas.resizable(1, 1) label = Label(canvas, font=("Courier", 30, 'bold'), ...
Read MoreAdd style to Python tkinter button
Tkinter has great support for creating the GUI programs based on python. It offers different ways of styling a button on the Tkinter canvas based on its font, size, colour etc. In this article we will see how to apply style to specific buttons or all buttons in general on the canvas.Applying to Specific ButtonsLets consider the case when we have two buttons in the canvas and we want to apply some styling only to the first button. We use the W.TButton as part of the configuration along with the font and the foreground colour.Examplefrom tkinter import * from tkinter.ttk ...
Read MorePython - Filtering data with Pandas .query() method
Pandas is a very widely used python library for data cleansing, data analysis etc. In this article we will see how we can use the query method to fetch specific data from a given data set. We can have both single and multiple conditions inside a query.Reading the dataLet’s first read the data into a pandas data frame using the pandas library. The below program just does that.Exampleimport pandas as pd # Reading data frame from csv file data = pd.read_csv("D:\heart.csv") print(data)OutputRunning the above code gives us the following result −Query with single conditionNext we see how we ...
Read MorePython - Filter out integers from float numpy array
As part of data cleansing activities, we may sometimes need to take out the integers present in a list. In this article we will have an array containing both floats and integers. We will remove the integers from the array and print out the floats.With astypeThe astype function will be used to find if an element from the array is an integer or not. Accordingly we will decide to keep or remove the element from the array and store it in the result set.Example Live Demoimport numpy as np # initialising array A_array = np.array([3.2, 5.5, 2.0, 4.1, 5]) ...
Read MorePython - Filter dictionary key based on the values in selective list
Sometimes in a Python dictionary we may need to to filter out certain keys of the dictionary based on certain criteria. In this article we will see how to filter out keys from Python dictionary.With for and inIn this approach we put the values of the keys to be filtered in a list. Then iterate through each element of the list and check for its presence in the given dictionary. We create a resulting dictionary containing these values which are found in the dictionary.Example Live DemodictA= {'Mon':'Phy', 'Tue':'chem', 'Wed':'Math', 'Thu':'Bio'} key_list = ['Tue', 'Thu'] print("Given Dictionary:", dictA) print("Keys for filter:", ...
Read MorePython - end parameter in print()
The print() function in python always creates a newline. But there is also a parameter for this function which can put other characters instead of new line at the end. In this article we will explore various options for this parameter.ExampleIn the below example we see various ways we can assign values to the end parameter and see the result from it. Live Demoprint("Welcome to ") print("Tutorialspoint") print("Welcome to ", end = ' ') print("Tutorialspoint") print("emailid", end='@') print("tutorialspoint.com")OutputRunning the above code gives us the following result −Welcome to Tutorialspoint Welcome to Tutorialspoint emailid@tutorialspoint.com
Read MorePython - Difference in keys of two dictionaries
Two python dictionaries may contain some common keys between them. In this article we will find how to get the difference in the keys present in two given dictionaries.With setHere we take two dictionaries and apply set function to them. Then we subtract the two sets to get the difference. We do it both ways, by subtracting second dictionary from first and next subtracting first dictionary form second. Those keys which are not common are listed in the result set.Example Live DemodictA = {'1': 'Mon', '2': 'Tue', '3': 'Wed'} print("1st Distionary:", dictA) dictB = {'3': 'Wed', '4': 'Thu', '5':'Fri'} print("1st Distionary:", ...
Read MorePython - Create a dictionary using list with none values
Suppose you are given a list but we want to convert it to dictionary. Dictionary elements hold two values are called key value pair, we will use in case of value. The elements of the list become keys and non will remain a placeholder.With dictThe dict() constructor creates a dictionary in Python. So we will use it to create a dictionary. The fromkeys method is used to create the dictionary elements.Example Live DemolistA = ["Mon", "Tue", "Wed", "Thu", "Fri"] print("Given list: ", listA) res = dict.fromkeys(listA) # New List print("The list of lists:", res)OutputRunning the above code gives us ...
Read MorePython - Convert given list into nested list
There may be a situation when we need to convert the elements in the list into a list in itself. In other words, create a list which is nested as its elements are also lists.Using iterationThis is the novel approach in which we take each element of the list and convert it to a format of lists. We use temporary list to achieve this. Finally all these elements which are converted to lists are group together to create the required list of lists.Example Live DemolistA = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri'] print("Given list:", listA) new_list = [] # Creating ...
Read MoreBroadcasting with NumPy Arrays in Python
We know the arithmetic operations between different arrays happens monthly if the arrays are of equal size awesome required specific size. But there are scenarios when we can take erase of unequal size and still apply arithmetic operations on them by enhancing one of the arrays by filling array with smaller ndim prepended with '1' in its shape. So basically broadcasting and array means changing its shape to any required shape.Rules of array BoradcastingArray with smaller ndim than the other is prepended with '1' in its shape.Size in each dimension of the output shape is maximum of the input sizes ...
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