Example of using https://github.com/WhyNotHugo/python-barcode for terminals (tested on dark background with FedEx app)

Code128-Terminal.py

import sys
from io import BytesIO
from barcode import Code128
from barcode.writer import BaseWriter

class TerminalWriter(BaseWriter):

	def __init__(self, dark_background=True, padding=16, height=8):
		blocks = ' ', '▐', '▌', '█'

		def initialize(raw_code):
			bit_length = 2
			[code] = raw_code
			l_padding = padding
			r_padding = padding + bit_length - (len(code) % bit_length)
			self.text_center_width = len(code) // bit_length
			self.text_padding = l_padding // bit_length

			code = '0' * l_padding + code + '0' * r_padding

			if dark_background:
				#Light on dark
				rendered_code = ''.join(blocks[~int(code[i:i+bit_length], 2)] for i in range(0, len(code), bit_length))
			else:
				#Dark on light
				rendered_code = ''.join(blocks[int(code[i:i+bit_length], 2)] for i in range(0, len(code), bit_length))

			self.pending_result = f'{rendered_code}\n' * height
			self.pending_text_line = bytearray(b' ' * len(rendered_code))

		def paint_module(xpos, ypos, width, color):
			pass

		def paint_text(x, y):
			text = bytes(self.text, 'ascii')
			for index, char in enumerate(text):
				self.pending_text_line[
					self.text_padding +
					(1 + 2 * index) * self.text_center_width // (2 * len(text))	#center under code
				] = char

			line = str(self.pending_text_line, 'ascii')
			self.pending_result += f'\n{line}\n'

		def finish():
			pass

		super().__init__(initialize, paint_module, paint_text, finish)

	def write(self, content, target):
		assert not content
		target.write(bytes(self.pending_result, 'utf-8'))


rv = BytesIO()
Code128(sys.argv[1], writer=TerminalWriter()).write(rv)

print(str(rv.getvalue(), 'utf-8'))