Please help me generating a python code for the assignment:

In this assignment, you will play the role of a data engineer at a manufacturing company. The company

has a legacy system that stores logs of manufacturing batches in a peculiar string format. Your task is to

validate and extract information from these log strings.

A valid log string adheres to the following format:

Batch Prefix: Each batch within the string starts with the prefix $\text{'}B\text{'}($case sensitive$).$

Batch ID: Following the prefix, there is a batch ID consisting of exactly four digits.

Product Code: Next, there is a product code that starts with $\text{'}P\text{'}($case sensitive$)$ followed by

exactly two letters $($uppercase $-$ case sensitive$).$

Quantity: Then, there is a quantity section that starts with $\text{'}Q\text{'}($case sensitive$)$ followed by an

integer above zero representing the quantity of products in the batch. Leading zeros are ok$.$ For

example, Q$0050$ is OK$,$ and $050$ is OK$.$ However, the leading zero should be eliminated once the

quantity number is extracted. For example, $0050$ is $50$ once extracted. Note that the quantity

output is an integer, not a string.

Date: Finally, there is a date section that starts with $\text{'}$D$\text{'}($case sensitive$)$ followed by a date in the

format YYYYMMDD$.$

Its $($YYYYMMDD$)$ length should be eight characters.

The first four characters represent the year, which should be between $2000$ and $2099.$

The next two characters represent the month, which should be between $01$ and $12.$

The last two characters represent the day, which should be between $01$ and $31($although

not all months have $31$ days, we'll ignore this detail for simplicity $-$ no need to check for

leap year. For example, $20230229$ is ok$,20230931$ is ok$).$

The string can contain multiple batches, each adhering to the format described above.

Your task is to write a Python function that takes this log string as input and returns a list of dictionaries

containing information about each batch if the string is valid. If the string is invalid, return "invalid". The

"invalid" return value is a string value, not a Boolean value.