System Requirements

Linux is the operating system
Python is the programming language.
Invocation is from the command line.
Key components of the system are shown in all capitals in the requirements for clarity.
Do not use all capitals for objects in the code. Favor camel case where reasonable.

Message Structure

The invocation of the PRODUCER from the command line is done with "python producer.py"
The PRODUCER listens to TCP/IP port 30101.
The PRODUCER consumes a MESSAGE from the TCP/IP port.
The PRODUCER finds the OPERATION in the MESSAGE.
If the OPERATION is "multiply", the PRODUCER determines the product of OPERAND-1 and OPERAND-2 as the ANSWER
If the OPERATION is "add", the PRODUCER determines the sum of OPERAND-1 and OPERAND-2 as the ANSWER.
The PRODUCER builds a message to return in the manner prescribed next.
The PRODUCER puts all the original parts of the message it received so that the inputs are traceable.
The PRODUCER puts the ANSWER into the MESSAGE.
The PRODUCER shows the message on the command line so the USER can see the content.
The PRODUCER sends the MESSAGE over the TCP/IP port so the CONSUMER can receive it.
The PRODUCER waits for another message.
The PRODUCER runs indefinitely until a USER sends Control-C.

The invocation of the CONSUMER from the command line is done with "python consumer.py"
Some number of parameters may be passed on the command line.
The first parameter is the name of an OPERATION.
The second parameter is OPERAND-1.
The third parameter is OPERAND-2.
If any parameters are not present, the user is given a help message on how to properly pass parameters.
The CONSUMER puts the OPERATION, OPERAND-1, and OPERAND-2 into the MESSAGE format that is common to both the PRODUCER and CONSUMER.
The CONSUMER leaves the ANSWER blank.
The CONSUMER connects to TCP/IP port 30101 and sends the MESSAGE it has built.
The CONSUMER waits for a MESSAGE from the PRODUCER to come over the TCP/IP port.
When a return MESSAGE is received from the PRODUCER, the CONSUMER displays it on the screen for the USER.

The USER is a human at the Linux command line.
The USER will invoke the PRODUCER for it to run indefinitely.
The USER will invoke the CONSUMER each time it needs an ANSWER by running "python consumer.py" with parameters.
The USER may provide different parameters to the CONSUMER each time the CONSUMER is run.

Ignore everything in this section and the remainder of the page. These are notes not requirements.

for i in {1..1000}; do python consumer.py add $(RANDOM % 10) + 1 $(RANDOM % 10) + 1 ; done