The technology is being used when you are sent an email saying you can track your package is known to be a scan code.
<h3>What are code-scanning technology?</h3>
This is known to be called a barcode reader or simply say a barcode scanner.
It is seen as a kind of an optical scanner that tends to read printed barcodes, as well as be able to decode the data that are found in the barcode and transmit the data to a computer.
Hence, The technology is being used when you are sent an email saying you can track your package is known to be a scan code.
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Answer & Explanation #1
To answer your first query. You can write a function that takes two arguments and returns their sum like this:
#Python program to add two numbers using a function
def add_num(a,b): #function for addition
sum=a+b
return sum #return value
num1=25 #variable declaration
num2=55
print("The sum is",add_num(num1,num2)) #call the function
Answer & Explanation #2
As for your error, I believe it is an indent error in your first return statement. All you must do is indent the return statement.
The GPS device in an automobile uses the satellite communication channel. GPS stands for Global Positioning System. It is based on the satellite navigation system that consists of a number of satellites. This is being used to loacate places and determine exact location, time and speed.