How Do You Use Multi-Line String Variables in JavaScript?

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Problem scenario
You want to present multiple lines in an “alert” message in JavaScript. How do you have new lines with text in JavaScript?

Possible Solution #1 (less preferred)
Use syntax like this:

var y = `
line1
line2
line3
`;

Possible Solution #2 (preferred)

var z = [
line1,
line2,
line3
].join(“\n”);

You could use this stand-alone file multiline.html:

<!DOCTYPE html<html<body<h2This demonstrates a multi-line variable in JavaScript</h2<p id=”demo”</p<scriptline1 = “aaa”
line2 = “bbb”
line3 = “ccc”

var z = [
line1, …

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How Do You Get Past “ImportError: No module named ‘boto'”?

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Problem scenario
You want to retrieve VPC peering connection info and other VPC info via Boto3. With Python 3 you tried to run this Python 2 (and Boto 2.x) program:

import boto.vpc
c = boto.vpc.connect_to_region(‘us-east-1’)
vpcs = c.get_all_vpcs()
vpc_peering_connection = c.create_vpc_peering_connection(vpcs[0].id, vpcs[1].id)

(It was written by the person who developed Boto 2.x here.)

You have a variety or problems with the syntax not working.

…

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How Do You Create a Function in JavaScript?

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Problem scenario
You want to create a function in JavaScript. This way you can use code over-and-over. How do you use a function in JavaScript?

Solution
Call this file contint.html

<!DOCTYPE html<html<body<h2This demonstrates accepting input and using a function in JavaScript</h2<p id=”demo”</p<scriptx = 5
var foo = prompt(“Please enter a number”);

function contintFunction(p1, …

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How Do You Configure the Wireless Security Camera with a TCP/IP Network?

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Problem scenario
You have a camera (e.g., a TCP/IP ADT security camera) attached to your a router on the network with your laptop. You know the camera’s MAC address by looking at the back of the camera itself (or you know its IP address on your network which is even more helpful). How do you use this camera over the network?

Solution
1.

…

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How Do You Get JavaScript to Present in a Web Browser?

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Problem scenario
You have a .js file on your desktop or on a web server. You want to have the code execute and present itself nicely (not just see the raw code) in a web browser. How do you do this?

Solution
You must use the .html extension. You must have

<html</html

tags. Here is an example. Name this file contint.html and place it on your desktop,

…

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What Does “__” Mean in Python?

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Problem scenario
You see two underscores or two underbars before a function in Python. What does this syntax signify?

Possible Solution #1
The answer is best explained by running this program once with no modification and a second time with a modification.

class ContintClass():
def __init__(self):
self.__completelyprivate = “1111111111”
self._semiprivate = “2222222”

foo = ContintClass()
#print(foo.__completelyprivate)

print(“Above is an attempt to print a completely private data member of an object”)

print(“Below is an attempt to print a semi-private data member of an object”)
print(foo._semiprivate)

Before you run the program the second time,

…

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Why is Your Python Programming Printing Duplicate Lines?

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Problem scenario
You have a Python program with print statements. When you run the program, you get twice as many print statements as you expect. What could be wrong?

Possible Solution #1
Do not name the program re.py or string.py. When you name the program re.py and have an import re statement, Python may print every line it is supposed to print twice.

…

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How Do You Write a Python Program to Create a .txt File with 50 Key-Value Pairs?

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Problem scenario
You want to create a .txt file that has 50 key-value pairs. You want the keys to be whole numbers. You want the values to be five-character strings. What should you do?

Solution

import random
import string
import sys

def randomword(length):
letters = string.ascii_lowercase
return ”.join(random.choice(letters) for i in range(length))

def printer(counter, webstera):
webstera[counter] = randomword(5)
if (counter < …

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