Shubham SayonSummary: To get a cron like scheduler in Python you can use one of the following methods: Use schedule module Use APScheduler Use timeloop library Use CronTab module Cron (also called a cron job) is a software utility that helps a user to schedule tasks in Unix-like systems. The tasks in cron are present in … Read more
Summary: To resolve an UnboundLocalError when the local variable is reassigned after the first use, you can either use the global keyword or the nonlocal keyword. The global keyword allows you to modify the values of a global variable from within a function’s local scope while the nonlocal keyword provides similar functionality in case of … Read more
Summary: To import a module given the full path, the following methods can be used : Using the importlib module Using SourceFileLoader class Using sys.path.append() function Adding __init__ file to the folder containing the module and then importing it Problem: How to import a module if its full path has been given? Example: Consider we … Read more
Summary: To call an external command in a Python script, use any of the following methods: Whether you are a developer or a system administrator, automation scripts are going to be a common part of your daily routine. These may include automating routine tasks like file backups or health checks. However, maintaining such shell scripts … Read more
Summary: To remove items from a list while iterating, use any of the following methods. List comprehension, Reverse iteration with the remove() method, Lambda Function with the filter() method, or While loop with the copy(), pop() and append() functions. Let’s start with defining the exact problem you want to solve. Problem: Given a list. How … Read more
Summary: To read inputs from a user and convert it to an integer, use the command int(input(‘Prompt’)) for Python 3 and input(‘Prompt’) for Python 2. To convert the user input to a float value, use float(input(‘Prompt’)). As a programmer, user input is one of the major components of your program if you want to make … Read more
To create a variable number of variables in Python, either use a dictionary or a namedtuple. Problem: How can you store variable number of variables in your Python code? Example: Consider that there is a requirement wherein you have to store the specifications of a product in a single variable which includes a variable … Read more
Summary: To accept valid inputs from the user either use a While Loop With Custom Validations or use the PyInputPlus module to avoid tedious validation definitions. You can also use recursion to prompt the user for entering the valid input. Overview Problem: Given a user input; accept the input only if it is valid otherwise … Read more
Summary: To merge two dictionaries dict1 and dict2 in a single expression, use the dictionary unpacking feature z = {**dict1, **dict2}. This creates a new dictionary and unpacks all (key-value) pairs into the new dictionary. Duplicate keys are automatically resolved by this method. Exercise: Which of the duplicated entry ends up in the dictionary? Other … Read more
Problem: Given the contents of a text file. How to search and replace a specific string or line in the file? Example: Let’s consider the following example where you want to replace the highlighted (bolded) text parts. Text in the file before replacing a line: There was an idea to bring together a group of … Read more
This article discusses a situation where you are required to implement an integer object which, when compared using the greater than operator >, to any other existing integer value in the program, will always return True. Before diving into the possible solutions, we must take note of the following: Python 2 consists of plain integers … Read more
Summary: Python Infinity is an undefined value (negative or positive) such that positive infinity is greater than while negative infinity is lesser than any other value in a given code. The numerous ways of using Python infinity are: Using float(‘Inf’) and float(‘-Inf’) Using the math module. Using the decimal module. Using the “Numpy” library. Using … Read more