import piecash

# open the book named test_book.gnucash
with piecash.open_book("test_book.gnucash") as b:

    # iterate on all the accounts and print the fullname
    # the order is the order in the database
    #
    # Assets
    # Assets:Investments
    # Assets:Investments:Brokerage Account
    # Assets:Investments:Brokerage Account:Bond
    # Assets:Investments:Brokerage Account:Stock
    for acc in b.accounts:
        print(acc.fullname)

    # walk down the account structure and run function f on each account
    def walk(acc, f):
        f(acc)
        for subacc in acc.children:
            walk(subacc, f)

    # function that prints the fullname account replacing the ":" by ","
    def print_fullname(acc):
       print(acc.fullname.replace(":",","))

    # walk !
    #
    # Assets
    # Assets,Investments
    # Assets,Investments,Brokerage Account
    # Assets,Investments,Brokerage Account,Bond
    # Assets,Investments,Brokerage Account,Stock
    walk(b.root_account, print_fullname)