Python | map() Function The map() function executes a specified function for each item in an iterable. The map() function in Python has two parameters, function and iterable. The map() function takes a function as an argument and …

yield is a keyword beares the ability to turn any function into a generator.  Much like the standard return keyword, but returns a generator object. It is also true that one function may observe multiple …

Python | Dogpile effect In case the cache expires, what happens when a client hits a website with multiple requests is what we call the dogpile effect. To avoid this, we can use a semaphore lock. When …

We can use the python re module to match the string import re def check(txt): # regex pattern pattern = 'ab{4,8}' if re.search(pattern, txt): print('Match found') else: print('Match not found') check("abcbbbb") # Match not found check("aabbbbbc") # …

Django is a framework that allows you to build large projects. On the other hand, Flask is used to build smaller websites but flask is much easier to learn and use compared to Django. Django is …

Python program to count the number of capital letters in a file. with open(FILE_NAME) as my_file: count = 0 text = my_file.read() for character in text: if character.isupper(): count += 1 print(count)    

Python | context manager Context managers allow you to allocate and release resources precisely when you want to. The most widely used example of context managers is the with() statement.  with open('some_file', 'w') as opened_file: opened_file.write('Hola!')   The …

Python | Check the memory usage of  an object >>> import sys >>> x = 100 >>> print(sys.getsizeof(x)) 28  

Negative indexes mean that you count from the right instead of the left. So, list[-1] refers to the last element, list[-2] is the second-last, and so on.

Django | Set up environment variables in Django   1. Install Django Environ In your terminal, inside the project directory, type: $ pip install django-environ 2. Import environ in settings.py import environ 3. Initialise environ …

Django follows a Model-View -Template (MVT) architecture which is a variant of the MVC architecture.  Model: Logical data structure behind the entire app and signified by a database. A model is used in Django to …

Python | Docstring  A documentation string or docstring is a multiline string used to document a specific code segment. The docstring should describe what the function or method does.  

Python modules are the files having python code which can be functions, variables, or classes. These go by .py extension. The most commonly available built-in modules are: os math sys random re datetime JSON

Python | Deep and Shallow copies Shallow copy does the task of creating new objects and storing references to original elements. This does not undergo recursion to create copies of nested objects. It just copies the …

Python | append() and extend() Function Both append() and extend() methods are methods used to add elements at the end of a list. append(element): append() method adds the given element at the end of the list. …