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''' 

Helper to preload windows dlls to prevent dll not found errors. 

Once a DLL is preloaded, its namespace is made available to any 

subsequent DLL. This file originated in the numpy-wheels repo, 

and is created as part of the scripts that build the wheel. 

''' 

import os 

import glob 

if os.name == 'nt': 

# convention for storing / loading the DLL from 

# numpy/.libs/, if present 

try: 

from ctypes import WinDLL 

basedir = os.path.dirname(__file__) 

except: 

pass 

else: 

libs_dir = os.path.abspath(os.path.join(basedir, '.libs')) 

DLL_filenames = [] 

if os.path.isdir(libs_dir): 

for filename in glob.glob(os.path.join(libs_dir, 

'*openblas*dll')): 

# NOTE: would it change behavior to load ALL 

# DLLs at this path vs. the name restriction? 

WinDLL(os.path.abspath(filename)) 

DLL_filenames.append(filename) 

if len(DLL_filenames) > 1: 

import warnings 

warnings.warn("loaded more than 1 DLL from .libs:\n%s" % 

"\n".join(DLL_filenames), 

stacklevel=1)