# make a list my_list = [1, 2, 3, 4] # extract/get value by index print(my_list[0])
Here is what the above code is Doing:
1. We create a list called my_list.
2. We print the first element of the list.
The first element of the list is at index 0.
from django.core.paginator import Paginator from django.shortcuts import render from myapp.models import Contact def listing(request): contact_list = Contact.objects.all() paginator = Paginator(contact_list, 25) # Show 25 contacts per page. page_number = request.GET.get(‘page’) page_obj = paginator.get_page(page_number) return render(request, ‘list.html’, {‘page_obj’: page_obj}) Here is what the above code is Doing: 1. We’re importing the Paginator class from django.core.paginator. 2….
>>> s = {1, 2, 3, 4, 5} >>> s.difference_update({1, 2, 3}) >>> s {4, 5} >>> s -= {4, 5} >>> s set() Here is what the above code is Doing: 1. We create a set s with the elements 1, 2, 3, 4, and 5. 2. We call the difference_update() method on s,…
df2 = df2.reindex(df1.index) # reorder df2 by index of df1 Here is what the above code is Doing: 1. df1.index returns the index of df1 2. df2.reindex(df1.index) reorders df2 by the index of df1 3. df2 = df2.reindex(df1.index) assigns the reordered df2 to df2
# n integer to chech # a = multipole # find the near a-multipole to n n + (a – n % a) Here is what the above code is Doing: 1. n % a gives the remainder of n divided by a. 2. n % a is subtracted from n to get the distance…
db.createUser({ user: “admin”, pwd: “adminpassword”, roles: [{ role: “userAdminAnyDatabase”, db: “admin” }] }) Here is what the above code is Doing: 1. Connect to the MongoDB server 2. Create a new database called “mydatabase” 3. Create a new collection called “customers” 4. Insert a document into the “customers” collection 5. Create a new user called…
# A function to determine if a year is a leap year. # Do not change this function. def is_leap_year(year): return (year % 4 == 0) and (year % 100 != 0) or (year % 400 == 0) # You should complete the definition of this function: def days_in_month(month, year): if month in [‘September’, ‘April’,…