example_2.py

import sys
from ged4py.parser import GedcomReader

def example_2():

  with GedcomReader(sys.argv[1]) as parser:
    # iterate over each FAM record in a file
    for i, fam in enumerate(parser.records0("FAM")):
      print(f"{i}:")

      # Get records for spouses, FAM record contains pointers to INDI
      #   records but sub_tag knows how to follow the pointers and return
      #   the referenced records instead.
      husband, wife = fam.sub_tag("HUSB"), fam.sub_tag("WIFE")
      if husband:
        print(f" husband: {husband.name.format()}")
      if wife:
        print(f" wife: {wife.name.format()}")

      # Get _value_ of the MARR/DATE tag
      marr_date = fam.sub_tag_value("MARR/DATE")
      if marr_date:
        print(f" marriage date: {marr_date}")

      # access all CHIL records, sub_tags method returns list (possibly empty)
      children = fam.sub_tags("CHIL")
      for child in children:
        # print name and date of birth
        print(f" child: {child.name.format()}")
        birth_date = child.sub_tag_value("BIRT/DATE")
        if birth_date:
          print(f" birth date: {birth_date}")