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Python Articles
Page 815 of 852
Collapsible Pane in Tkinter Python
Tkinter is the GUI building library of python. In this article we will see how we can create a collapsible pane. They are usefult when we have some large amount of data to be displayed over a GUI canvas but we do not want to be displayed always. It is made collapsible so that it can be displayed as and when needed.The below program creates the collapsible pane where we see the result both after expanding and contracting the arrow. The code comments indicate the approach we take at each step.Examplefrom tkinter import * import tkinter as tk from tkinter ...
Read MoreASCII art using Python pyfiglet module
The ASCII text can be used to display many stylish texts by using the module pyfiglet. After installing this module we can use it to control the font that can be used to display the result. In the below program we see various results by choosing various font types.Example# import pyfiglet module import pyfiglet #Text in default font out = pyfiglet.figlet_format("Point") print(out)OutputRunning the above code gives us the following result −Example# import pyfiglet module import pyfiglet #Text in slant font out = pyfiglet.figlet_format("Point", font="slant") print(out)OutputRunning the above code gives us the following result −Example# import pyfiglet module import pyfiglet #Text ...
Read MoreAdding K to each element in a Python list of integers
In this article, we will learn how to add a constant K value to each element in a Python list of integers. A list is a data type in Python that stores a sequence of items separated by commas, like this − List = [item1, item2, item3…] Suppose we have a list of integers called "a" and a constant value "k." We need to add this "k" to each item in the "a" list. For example − Input: a = [5, 10, 15, 20] k = 5 Output: #On adding 5 to each element of the ...
Read MoreHow to insert a Python tuple in a PostgreSql database?
PostgreSql database is by default installed on port number 5432. Python interface to PostgreSql is provided by installing psycopg2 module. Assuming that test database and employee table with fname, sname, age, gender and salary fields is available.First establish connection and obtain cursor object by following statements in Python script.import psycopg2 conn = psycopg2.connect(database = "test", user = "postgres", password = "pass123", host = "localhost", port = "5432") cur = conn.cursor()Data to be inserted in employee table is stored in the form of tuple objectt1=('Mac', 'Mohan', 20, 'M', 2000)Next set up the insert query using this tuplesql="insert into employee values(%s, %s, ...
Read MoreHow to insert a Python tuple in a MySQL database?
Assuming that MySQL database named as test is present on server and a table named employee is also created. The table has five fields fname, lname, age, gender, and salary.A tuple object containing data of a record is defined ast1=('Mac', 'Mohan', 20, 'M', 2000)To establish interface between MySQL and Python 3, you need to install PyMySQL module. Then you can set up the connection using following statementsimport PyMySQL # Open database connection db = PyMySQL.connect("localhost", "root", "", "test" ) # prepare a cursor object using cursor() method cursor = db.cursor()Next step is to set up the insert query using data ...
Read MoreHow to create a unique directory name using Python?
You can use the tempfile module to create a unique temporary directory in the most secure manner possible. There are no race conditions in the directory’s creation. The directory is readable, writable and searchable only by the creating user ID. Note that the user of mkdtemp() is responsible for deleting the temporary directory when done with it. To create a new temporary directory, use it as follows −import tempfile _, temp_dir_path = tempfile.mkdtemp() # Do what you want with this directory # And remove the directory when doneNote that you need to manually delete this directory after you're done with ...
Read MoreHow can I import modules for a Python Azure Function?
As of writing this, Python support for Azure Functions is experimental. So right now there is no way to directly get a module from a package manager to be installed on your instance. You'll need to bring your own modules with code. No modules are available by default on Azure Functions. You can add them by uploading it via the portal UX or kudu (which is handy for lots of files).If you don't mind using virtualenv, there is an alternative.Create your python script on Azure Functions.Open a Kudu console and cd to your script location.Create a virtualenv in this folder ...
Read MoreAdd trailing Zeros to a Python string
As part of data processing activity we sometimes need to append one string with another. In this article we will see how to append dynamic number of zeros to a given string. This can be done by using various string functions as shown in the programs below.Using ljust and lenPython string method ljust() returns the string left justified in a string of length width. Padding is done using the specified fillchar (default is a space). The len() returns the length of the string. We add trailing zeros to the string by manipulating the length of the given string and the ...
Read MoreCan we explicitly define datatype in a Python Function?
Yes, in Python, you can explicitly define the datatype of function parameters and return values using type hints or type annotations. Even if you specify the data types using type hints, Python will still run the code even when the wrong types are passed. The execution of the program will not be interrupted, and an error will not be raised.To find these type-related mistakes, you can use tools like mypy or pyright that check your code before it runs. Using Type Hints in Python Functions To add type hints to a parameter of a function, you need to specify the ...
Read MoreHow to implement a custom Python Exception with custom message?
For the given code above the solution is as followsExampleclass CustomValueError(ValueError): def __init__(self, arg): self.arg = arg try: a = int(input("Enter a number:")) if not 1 < a < 10: raise CustomValueError("Value must be within 1 and 10.") except CustomValueError as e: print("CustomValueError Exception!", e.arg)OutputEnter a number:45 CustomValueError Exception! Value must be within 1 and 10. Process finished with exit code 0
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