The intersection() method checks the intersection of items between two or more sets, that is, items that exist in all sets. In the example below both sets together have the item ‘bmw’. car_brands_set_one = {'bmw', 'mclaren', 'ferrari'} car_brands_set_two = {'honda',…
The hasattr() function checks if an object has a certain attribute. The first argument is the object being checked and the second argument is the attribute. If the attribute exists in the object the method returns True, otherwise it returns…
Use the find() method to check if a string has certain substring. The method returns the index of the first occurrence of the given value. Remember the index count starts at 0. phrase = "This is a regular text" print(phrase.find('This'))…
The round() function rounds a given number with the specified number of decimals. If you don’t specify the number of decimals, the default will be zero decimals. print(round(32.8476)) print(round(32.8476,1)) print(round(32.8476,2)) print(round(32.8476,3)) 33 32.8 32.85 32.848
Use the built-in extend() method from list to add all the items of an iterable to the end of a list. The method doesn’t return any value, it alters the original list. Lists, sets and tuples are examples of iterables.…
The issubset() method checks if a set is a subset of another set, that is, if all the items of one set exist in the other set. The method returns True if one set is subset of another, or False…
To reverse a string use the slice syntax: my_string = "ferrari" my_string_reversed = my_string[::-1] print(my_string) print(my_string_reversed) ferrari irarref The slice syntax allows you to set a step, which is -1 in the example. The default step is 1, that is,…
The pythonic way to check if a key already exists in a Dictionary in Python is to use the membership operator in. people = {'Bob':30, 'Mary':25} if 'Bob' in people: print('Bob exists!') else: print('There is no Bob!') Bob exists! To…
If you want just the current date, simply use the today() method from the date imported from the datetime module. from datetime import date current_date = date.today() print(current_date) 2020-05-02 If you want the current date and also the time, use…
To reverse a list in-place, that is, without creating a new list, use the builtin reverse() method from list: car_brands = ["bmw", "ferrari", "mclaren"] print(car_brands) car_brands.reverse() print(car_brands) ['bmw', 'ferrari', 'mclaren'] ['mclaren', 'ferrari', 'bmw'] To keep the original list and assign…