nnels-pipeline-gadget/dynamic_loader.py at develop · BCLibCoop/nnels-pipeline-gadget · GitHub

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######################################################
# Purpose: To load modules dynamically so that used  #
#          modules work properly and consistantly    #
#          across different Python installations     #
######################################################

#----------------------------------------------------#
# Purpose: To load the XML parser module dynamically #
# Parameters: N/A                                    #
# Return: Boolean - if it was successful             #
# Additional Notes: This allows classes to reference #
#                   the etree object for XML parsing #
#                   via a call to                    #
#                   <dynamic_loader>.etree           #
#----------------------------------------------------#
def load_XML_parser():
	# Boolean flag to represent if the import worked (default to False as
	# want to assume NOT imported until know otherwise)
	success = False

	# Make the import global to the file and by extension accessible to
	# other modules
	global etree

	try:
 		# Load the etree from/as the lxml package or module
		from lxml import etree

		# DEBUGGING: A print statement to allow the "user" to know
		#            which version was imported
		#print("running with lxml.etree")

		# Since we've successfully imported the etree from/as the lxml
		# package or module reset the Boolean flag to True
		success = True
	except ImportError:
		try:
    			# Load the etree from/as the xml.etree package or
			# module (Python 2.5)
			import xml.etree.cElementTree as etree

			# DEBUGGING: A print statement to allow the "user" to
			#            know which version was imported
			#print("running with cElementTree on Python 2.5+")

			# Since we've successfully imported the etree from/as
			# the xml.etree package or module reset the Boolean flag
			# to True
			success = True
		except ImportError:
			try:
				# Load the etree from/as the xml.etree package
				# or module (Python 2.5)
				import xml.etree.ElementTree as etree

				# DEBUGGING: A print statement to allow the
				#            "user" to know which version was
				#            imported
				#print("running with ElementTree on Python 2.5+")

				# Since we've successfully imported the etree
				# from/as the xml.etree package or module reset
				# the Boolean flag to True
				success = True
			except ImportError:
				try:
					# Load the etree from/as the
					# cElementTree (normal cElementTree
					# install)
					import cElementTree as etree

					# DEBUGGING: A print statement to allow
					#            the "user" to know which
					#            version was imported
					#print("running with cElementTree")

					# Since we've successfully imported the
					# etree from/as the cElementTree package
					# or module reset the Boolean flag to
					# True
					success = True
				except ImportError:
					try:
						# Load the etree from/as the
						# ElementTree (normal
						# ElementTree install)
						import elementtree.ElementTree as etree

						# DEBUGGING: A print statement
						#            to allw the "user"
						#            to know which
						#            version was
						#            imported
					 	#print("running with ElementTree")
						# Since we've successfully
						# imported the etree from the
						# ElementTree package or module
						# reset the Boolean flag to True
						success = True
					except ImportError:

						# DEBUGGING: A print statement
						#            to allow the "user"
						#            to know that we
						#            couldn't seem to
						#            import any version
						#            successfully
						print("Failed to import ElementTree from any known place")

	# Return the Boolean flag
	return success

def load_abc():
	global abc
	import abc
def load_subprocess():
	global subprocess
	import subprocess
def load_json():
	global json
	import json
def load_Metadata_Record():
	global Metadata_Record
	from Metadata_Record import Metadata_Record
def load_data_structs():
	global structs
	import  data_structs as structs