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Bulk Data Python Package makes it easy to create and manipulate bulk data files.

Project description

Bulk Data Python Package Documentation Status Updates

Bulk Data Python Package makes it easy to create and manipulate bulk data files.


  • Card objects represent Bulk Data Cards; functionally similar to list objects but can be serialized to a bulk data formatted string representing the card.

  • No explicit Bulk Data Card definitions are necessary.

  • Deck objects represent a Bulk Data “Deck” containing Bulk Data Cards that can be added, edited, or deleted.

  • Loading BDF files containing mixed formatting is supported.

  • Bulk Data Formats currently supported:
    • Fixed (same as Small in NASTRAN)

    • Free


This a quick example of using the bulkdata package to update a BDF file.

from bulkdata import Deck, Card

bdf_filename = BDF_DIR + "/example.bdf"

# load Deck from BDF file
with open(bdf_filename) as bdf_file:
    deck = Deck.load(bdf_file)

# CORD2R variables
cid = 1
rid = None
a = [-2.9, 1.0, 0.0]
b = [3.6, 0.0, 1.0]
c = [5.2, 1.0, -2.9]

# create CORD2R card
cord2r = Card("CORD2R")

# print the CORD2R card in fixed format (the default)
print("-- CORD2R fixed formatting --")

# print the CORD2R card in free format
print("-- CORD2R free formatting --")

# add card to the deck

# get AEROZ card
aeroz = deck.find_one({"name": "AEROZ"})

print("-- AEROZ before update --")

# update the ACSID field (first one)
aeroz[0] = cid

# update mass and length units fields while we're at it
aeroz[[3, 4]] = ["N", "M"]

print("-- AEROZ after update --")

# dump Deck to update BDF file
with open(bdf_filename, "w") as f:


-- CORD2R fixed formatting --
CORD2R  1               -2.9    1.      0.      3.6     0.      1.      +0
+0      5.2     1.      -2.9

-- CORD2R free formatting --
CORD2R,1, ,-2.9,1.,0.,3.6,0.,1.,+0

-- AEROZ before update --
AEROZ           YES     NO      SLIN    IN      400.    300     12000.  +0
+0      10.     0.      0.

-- AEROZ after update --
AEROZ   1       YES     NO      N       M       400.    300     12000.  +0
+0      10.     0.      0.

For a more detailed overview check out the documentation and/or the bulkdata-usage notebook.


  • Add support for BDF files containing INCLUDE statements.

  • Add support for Large Field entries

  • Add support for BDF files with tabs?


This package was created with Cookiecutter and the audreyr/cookiecutter-pypackage project template.


0.4.0 (2020-04-10)

  • First release.

0.5.3 (2020-04-14)

  • Fixes some bugs in the Card class.

  • Expanded documentation on:
    • usage

    • API
      • Card class

      • Deck class

0.6.0 (2020-04-23)

  • Sorting deck cards is now possible with Deck.sort method.

  • Dumping cards containing trailing blank fields no longer creates blank continuation lines, as trailing blank fields are ignored when converting card to string.

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