Why Does a PHP Program Call to a Python Program Work from the Back-End but Not from the Front-End?

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Problem scenario
In your PHP program, the Python binary is executing regardless of how the PHP program is run (e.g., from a command line with the php command or when downloaded from a web browser). The PHP program will launch Python programs if the PHP program is invoked from the back-end with PHP. But Python programs are not being interpreted by Python when a web browser loads the PHP file.

…

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How Do You Troubleshoot a Web UI Problem with GitLab?

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Problem scenario
When you are using GitLab, you receive various 500 errors. The web UI is not working correctly. What should you do?

Possible solution #1
1. Go to the back-end of the GitLab server. Run this: sudo gitlab-ctl tail
2. Reproduce the web UI problems that you are having. Examine the output.

Possible solution #2
You may want to install Fiddler on your desktop to get more details about the front-end.

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How Do You Troubleshoot the Python Problem “NameError: global name ‘var2’ is not defined”?

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Problem scenario
You have a Python program that works, but you get an error when you run it. You get a message like this: “NameError: global name ‘var2’ is not defined”

Here is your source code:

def fun1(var1):
print(“this is how it works”)
var1 = var2
return var2
b = fun1(“check it out”)
print(b)

What should you do about this error?

Solution
A variable inside a function must be defined.

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How Do You Create a Master Branch (or First Branch) with the GitHub API?

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Problem scenario
You do not want to copy a branch to create a new one. How do you create a branch of a repository that has no branches?

Solution
You must know the relevant organization name of the Git repository and the name of the repository itself. Do these changes:

  • Change “acme” to the organization name
  • Change “goodrepo” to the repository name of your choice.

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How Do You Troubleshoot a pom.xml File?

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Problem scenario
You are trying to run your Java program from a .jar file. You get an error like this:

Error: Could not find or load main class target.contint-0.1.0.jar
Caused by: java.lang.ClassNotFoundException: target.contint-0.1.0.jar

What should you do?

Solution
Examine the mainClass stanza. The word to the left of the period should be the name of the package.

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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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