Why a extra blank appeared in calling number_to_words to convert 541140 to words with andword=','

[66qzd]

code:
`import inflect

p = inflect.engine()

print(p.number_to_words(541440))
print(p.number_to_words(541440, andword=','))
`
result:(the extra blank appear after four hunred)
five hundred and forty-one thousand, four hundred and forty
five hundred, forty-one thousand, four hundred , forty