





#
# Sort large text files in a minimum amount of memory
#
import argparse
import os



class 							__lowerCAmelCase :
			lowerCamelCase_  :  Tuple     =   "block_{0}.dat"






			def __init__(self      ,							__magic_name__					)  ->     int:


							'''simple docstring'''



							snake_case_		:					int			    =						filename
							snake_case_		:					Optional[Any]			    =						[]






			def     lowerCamelCase						(self      ,							__magic_name__      ,							__magic_name__					)  ->     int:


							'''simple docstring'''



							snake_case_		:					Dict			    =						self.BLOCK_FILENAME_FORMAT.format(SCREAMING_SNAKE_CASE_					)
							with open(SCREAMING_SNAKE_CASE_      ,							'''w'''					) as file:
											file.write(SCREAMING_SNAKE_CASE_					)
							self.block_filenames.append(SCREAMING_SNAKE_CASE_					)






			def     lowerCamelCase						(self					)  ->     str:


							'''simple docstring'''



							return self.block_filenames






			def     lowerCamelCase						(self      ,							__magic_name__      ,							__magic_name__=None					)  ->     int:


							'''simple docstring'''



							snake_case_		:					Any			    =						0
							with open(self.filename					) as file:
											while True:
															snake_case_		:					Union[str, Any]			    =						file.readlines(SCREAMING_SNAKE_CASE_					)

															if lines == []:
																			break

															if sort_key is None:
																			lines.sort()
															else:
																			lines.sort(key=SCREAMING_SNAKE_CASE_					)

															self.write_block(''''''.join(SCREAMING_SNAKE_CASE_					)      ,							SCREAMING_SNAKE_CASE_					)
															i += 1






			def     lowerCamelCase						(self					)  ->     List[str]:


							'''simple docstring'''



							map(os.remove      ,							self.block_filenames					)




class 							__lowerCAmelCase :






			def     lowerCamelCase						(self      ,							__magic_name__					)  ->     Optional[int]:


							'''simple docstring'''



							snake_case_		:					Tuple			    =						-1
							snake_case_		:					int			    =						None

							for i in range(len(SCREAMING_SNAKE_CASE_					)					):
											if min_str is None or choices[i] < min_str:
															snake_case_		:					Tuple			    =						i

							return min_index




class 							__lowerCAmelCase :






			def __init__(self      ,							__magic_name__					)  ->     Tuple:


							'''simple docstring'''



							snake_case_		:					Union[str, Any]			    =						files
							snake_case_		:					Optional[int]			    =						set()
							snake_case_		:					Optional[Any]			    =						len(SCREAMING_SNAKE_CASE_					)
							snake_case_		:					str			    =						{i: None for i in range(self.num_buffers					)}






			def     lowerCamelCase						(self					)  ->     Optional[int]:


							'''simple docstring'''



							return {
							    i: self.buffers[i] for i in range(self.num_buffers					) if i not in self.empty
							}






			def     lowerCamelCase						(self					)  ->     Union[str, Any]:


							'''simple docstring'''



							for i in range(self.num_buffers					):
											if self.buffers[i] is None and i not in self.empty:
															snake_case_		:					List[str]			    =						self.files[i].readline()

															if self.buffers[i] == "":
																			self.empty.add(SCREAMING_SNAKE_CASE_					)
																			self.files[i].close()

							if len(self.empty					) == self.num_buffers:
											return False

							return True






			def     lowerCamelCase						(self      ,							__magic_name__					)  ->     List[str]:


							'''simple docstring'''



							snake_case_		:					str			    =						self.buffers[index]
							snake_case_		:					Optional[Any]			    =						None

							return value




class 							__lowerCAmelCase :






			def __init__(self      ,							__magic_name__					)  ->     Optional[Any]:


							'''simple docstring'''



							snake_case_		:					List[str]			    =						merge_strategy






			def     lowerCamelCase						(self      ,							__magic_name__      ,							__magic_name__      ,							__magic_name__					)  ->     Any:


							'''simple docstring'''



							snake_case_		:					Any			    =						FilesArray(self.get_file_handles(SCREAMING_SNAKE_CASE_      ,							SCREAMING_SNAKE_CASE_					)					)
							with open(SCREAMING_SNAKE_CASE_      ,							'''w'''      ,							SCREAMING_SNAKE_CASE_					) as outfile:
											while buffers.refresh():
															snake_case_		:					Tuple			    =						self.merge_strategy.select(buffers.get_dict()					)
															outfile.write(buffers.unshift(SCREAMING_SNAKE_CASE_					)					)






			def     lowerCamelCase						(self      ,							__magic_name__      ,							__magic_name__					)  ->     Any:


							'''simple docstring'''



							snake_case_		:					List[Any]			    =						{}

							for i in range(len(SCREAMING_SNAKE_CASE_					)					):
											snake_case_		:					List[str]			    =						open(filenames[i]      ,							'''r'''      ,							SCREAMING_SNAKE_CASE_					)  # noqa: UP015

							return files




class 							__lowerCAmelCase :






			def __init__(self      ,							__magic_name__					)  ->     Dict:


							'''simple docstring'''



							snake_case_		:					Any			    =						block_size






			def     lowerCamelCase						(self      ,							__magic_name__      ,							__magic_name__=None					)  ->     int:


							'''simple docstring'''



							snake_case_		:					Optional[Any]			    =						self.get_number_blocks(SCREAMING_SNAKE_CASE_      ,							self.block_size					)
							snake_case_		:					Any			    =						FileSplitter(SCREAMING_SNAKE_CASE_					)
							splitter.split(self.block_size      ,							SCREAMING_SNAKE_CASE_					)

							snake_case_		:					List[Any]			    =						FileMerger(NWayMerge()					)
							snake_case_		:					Optional[int]			    =						self.block_size / (num_blocks + 1)
							merger.merge(splitter.get_block_filenames()      ,							filename + '''.out'''      ,							SCREAMING_SNAKE_CASE_					)

							splitter.cleanup()






			def     lowerCamelCase						(self      ,							__magic_name__      ,							__magic_name__					)  ->     List[Any]:


							'''simple docstring'''



							return (os.stat(SCREAMING_SNAKE_CASE_					).st_size / block_size) + 1






def   lowerCamelCase_		(       _UpperCamelCase				)	->		str:






				"""simple docstring"""


				if string[-1].lower() == "k":
								return int(string[:-1]				) * 1_024
				elif string[-1].lower() == "m":
								return int(string[:-1]				) * 1_024 * 1_024
				elif string[-1].lower() == "g":
								return int(string[:-1]				) * 1_024 * 1_024 * 1_024
				else:
								return int(snake_case__				)






def   lowerCamelCase_		(       )	->		str:






				"""simple docstring"""


				snake_case_		:					str			    =						argparse.ArgumentParser()
				parser.add_argument(
				    '''-m'''				,       '''--mem'''				,       help='''amount of memory to use for sorting'''				,       default='''100M'''				)
				parser.add_argument(
				    '''filename'''				,       metavar='''<filename>'''				,       nargs=1				,       help='''name of file to sort'''				)
				snake_case_		:					int			    =						parser.parse_args()

				snake_case_		:					Optional[Any]			    =						ExternalSort(parse_memory(args.mem				)				)
				sorter.sort(args.filename[0]				)


if __name__ == "__main__":
	main()







def   lowerCamelCase_		(       _UpperCamelCase				)	->		int:






				"""simple docstring"""


				barcode //= 10  # exclude the last digit
				snake_case_		:					str			    =						False
				snake_case_		:					str			    =						0

				# extract and check each digit
				while barcode != 0:
								snake_case_		:					Any			    =						1 if checker else 3
								s += mult * (barcode % 10)
								barcode //= 10
								snake_case_		:					Tuple			    =						not checker

				return (10 - (s % 10)) % 10






def   lowerCamelCase_		(       _UpperCamelCase				)	->		bool:






				"""simple docstring"""


				return len(str(_UpperCamelCase				)				) == 13 and get_check_digit(_UpperCamelCase				) == barcode % 10






def   lowerCamelCase_		(       _UpperCamelCase				)	->		int:






				"""simple docstring"""


				if str(_UpperCamelCase				).isalpha():
								snake_case_		:					Optional[Any]			    =						f'''Barcode \'{barcode}\' has alphabetic characters.'''
								raise ValueError(_UpperCamelCase				)
				elif int(_UpperCamelCase				) < 0:
								raise ValueError('''The entered barcode has a negative value. Try again.'''				)
				else:
								return int(_UpperCamelCase				)


if __name__ == "__main__":
	import doctest

	doctest.testmod()
	lowerCAmelCase_												=       get_barcode(input('''Barcode: ''').strip())

	if is_valid(barcode):
		print(F'''\'{barcode}\' is a valid barcode.''')
	else:
		print(F'''\'{barcode}\' is NOT a valid barcode.''')
