Source code for pyNastran.utils.nastran_utils

import os
import subprocess
from typing import List, Dict, Union, Optional, Tuple

[docs]def run_nastran(bdf_filename: str, nastran_cmd: str='nastran', keywords: Optional[Union[str, List[str], Dict[str, str]]]=None, run: bool=True, run_in_bdf_dir: bool=True, cleanup: bool=False) -> Tuple[Optional[int], List[str]]: """ Call a nastran subprocess with the given filename Parameters ---------- bdf_filename : string Filename of the Nastran .bdf file keywords : str/dict/list of strings, optional Default keywords are `'scr=yes'`, `'bat=no'`, `'old=no'`, and `'news=no'` run : bool; default=True let's you disable actually running Nastran to test out code/get the call arguments run_in_local_dir : bool; default=True True : output (e.g., *.f06) will go to the current working directory (default) False : outputs (e.g., *.f06) will go to the input BDF directory cleanup : bool; default=False remove the *.log, *.f04, and *.plt files Returns ------- return_code : int the nastran flag cmd_args : List[str] the nastran commands that go into subprocess Example ------- keywords_str = 'scr=yes old=no mem=1024mb' keywords_list = ['scr=yes', 'old=no', 'mem=1024mb'] keywords_dict = { 'scr' : 'yes', 'old' : 'no', 'mem' : '1024mb', } run_nastran(bdf_filename, keywords_str) run_nastran(bdf_filename, keywords_list) run_nastran(bdf_filename, keywords_dict) """ keywords_list = _get_keywords_list(keywords=keywords) pwd = os.getcwd() bdf_directory = os.path.dirname(bdf_filename) switch_dir = bdf_directory != '' and run_in_bdf_dir if switch_dir: os.chdir(bdf_directory) assert os.path.exists(bdf_filename), bdf_filename #assert os.path.exists(nastran_cmd), nastran_cmd call_args = [nastran_cmd, str(bdf_filename)] + keywords_list return_code = None if run: return_code = if run and cleanup: base = os.path.basename(bdf_filename)[0] fnames = [ base + '.f04', base + '.log', base + '.plt', ] for fname in fnames: if os.path.exists(fname): print(f'removing {fname}') os.remove(fname) if switch_dir: os.chdir(pwd) return return_code, call_args
def _get_keywords_list(keywords: Optional[Union[str, List[str], Dict[str, str]]]=None) -> List[str]: if keywords is None: keywords_list = ['scr=yes', 'bat=no', 'old=no', 'news=no', 'notify=no'] # 'mem=1024mb', elif isinstance(keywords, str): keywords_list = keywords.split() else: if isinstance(keywords, (list, tuple)): keywords_list = keywords else: keywords_list = [] for keyword, value in keywords.items(): if value is None: continue keywords_list.append(f'{keyword}={value}') return keywords_list