fname = input('Enter the file name: ')
	file = open(fname)
	operators = {'=' : 'operator','+' : 'operator','-' : 'operator','/' : 'operator','==' : 'operator','%' : 'operator'
	,'*' : 'operator','<' : 'operator','>' : 'operator', '<=' : 'operator', '>=' : 'operator', '+=' : 'operator',
	'-=': 'operator'}
	operators_key = operators.keys()
	keyword = ['for','while','False','await','else','if','import','pass','None','break','except','in','raise','True'
	,'class','finally','is','return','and','continue','lambda','try','as','def','from','nonlocal','assert','del'
	,'global','not','with','async','elif','or','yield','endwhile','forend','ifend','range','print']
	punctuation_symbol = { ':' : 'colon', ';' : 'semi-colon', '.' : 'dot' , ',' : 'comma' }
	punctuation_symbol_key = punctuation_symbol.keys()
	separator = { '(' : 'separator', ')' : 'separator',' ':'space' }
	separator_key = separator.keys()
	dataFlag = False
	a=file.read()
	program = a.split(" ")
	print("lexems ---------- token ")
	for line in program:
	tokens=line.split(' ')
	for token in tokens:
	if token in operators_key:
	print(token ,"----------", operators[token])
	elif token in keyword:
	print(token ,"---------- keyword")
	elif token in punctuation_symbol_key:
	print (token ,"----------", punctuation_symbol[token])
	elif token in separator_key:
	print (token ,"----------", separator[token])
	else:
	try:
	variable = int(token)
	variable = float(token)
	except ValueError:
	variable = None
	if variable:
	print (token ,"---------- real")
	elif token == ' ':
	pass
	else:
	print (token ,"---------- identifier")
	dataFlag=False

Find at least 3 test cases (< 10 , < 21, > 21 source lines) in python