Bulk Data Python Package

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

• Free software: MIT license
• Documentation: https://bulkdata.readthedocs.io.

Features

• 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

Example

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

frombulkdataimportDeck, Cardbdf_filename=BDF_DIR+"/example.bdf"# load Deck from BDF filewithopen(bdf_filename) asbdf_file:
deck=Deck.load(bdf_file)
# CORD2R variablescid=1rid=Nonea= [-2.9, 1.0, 0.0]
b= [3.6, 0.0, 1.0]
c= [5.2, 1.0, -2.9]
# create CORD2R cardcord2r=Card("CORD2R")
cord2r.append(cid)
cord2r.append(rid)
cord2r.extend(a)
cord2r.extend(b)
cord2r.extend(c)
# print the CORD2R card in fixed format (the default)print("-- CORD2R fixed formatting --")
print(cord2r.dumps("fixed"))
# print the CORD2R card in free formatprint("-- CORD2R free formatting --")
print(cord2r.dumps("free"))
# add card to the deckdeck.append(cord2r)
# get AEROZ cardaeroz=deck.find_one({"name": "AEROZ"})
print("-- AEROZ before update --")
print(aeroz.dumps())
# update the ACSID field (first one)aeroz[0] =cid# update mass and length units fields while we're at itaeroz[[3, 4]] = ["N", "M"]
print("-- AEROZ after update --")
print(aeroz.dumps())
# dump Deck to update BDF filewithopen(bdf_filename, "w") asf:
deck.dump(f)

Output:

-- 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
+0,5.2,1.,-2.9
-- 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.

TODO

• Add support for BDF files containing INCLUDE statements.
• Add support for Large Field entries
• Add support for BDF files with tabs?

Credits

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