Read and update metadata of PDFs in Python using pypdf library. Check https://products.documentprocessing.com/metadata/python/pypdf/ for more details.

read-metadata-of-pdf-using-pypdf-library.py

# Import PdfReader module from the pypdf library
from pypdf import PdfReader

# Create a PdfReader object and load the input PDF file
reader = PdfReader("meta-pdf.pdf")

# Reading metadata
meta = reader.metadata

# Print the metadata
print(meta.author)
print(meta.producer)
print(meta.subject)
print(meta.title)

update-metadata-of-pdf-using-pypdf-library.py

# Import PdfReader and PdfWriter modules from the pypdf library
from pypdf import PdfReader, PdfWriter

# Import the datetime module
from datetime import datetime

# Create a PdfReader object and load the input PDF file
reader = PdfReader("documentprocessing.pdf")

# Creating a new PDF writer object using PdfWriter
writer = PdfWriter()

# Adding all pages from the input PDF to the new writer
for page in reader.pages:
    writer.add_page(page)

# Format the current date and time for the metadata
# UTC time offset (optional, adjust as needed)
utc_time = "-05'00'"

# Current date and time formatted for metadata
time = datetime.now().strftime(f"D\072%Y%m%d%H%M%S{utc_time}")  

# Writing new metadata to the PDF
writer.add_metadata(
    {
        "/Author": "Documentprocessing",    # Author information
        "/Producer": "Microsoft Word",       # Software used to produce the PDF
        "/Title": "Title",                   # Document title
        "/Subject": "Subject",               # Document subject
        "/Keywords": "Keywords",             # Keywords associated with the document
        "/CreationDate": time,               # Date and time the document was created
        "/ModDate": time,                    # Date and time the document was last modified
        "/Creator": "Creator",               # Application that created the original document
    }
)

# Save the new PDF to a file
with open("meta-pdf.pdf", "wb") as f:
    writer.write(f)