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…
Use the buit-in index() method from list to find the index of an item in a list in Python. Remember the index count starts at 0, so the position of ‘mclaren’ is 2. car_brands = ['bmw', 'ferrari', 'mclaren'] position =…
Use the randrange() method to generate a random integer in a given range. The example below generates numbers in the range from 1 to 100. Notice that the possible outcomes are from 1 to 99, 100 is excluded. import random…
The timedelta object from the datetime module allows you to add any number of days to a date object. In this example I always take the current date using the date.today() method. Then I set a timedelta of 2 days…
Use the random() method from the random module to generate a float number between 0 and 1. 0 is included as a possible outcome and 1 is excluded, meaning the method might return a 0, but never 1. import random…
Let’s see how to convert a datetime into a string in Python. This conversion can be done using the strftime() method from the datetime class. This example shows a few different formats for current date and time: Default date and…
The timedelta object from the datetime module allows you to subtract any number of days from a date object. In this example I always take the current date using the date.today() method. Then I set a timedelta of 2 days…