The sep='' with regards to a function consider sets the named argument sep to an unfilled string. See the print() work; sep is the separator utilized between various qualities when printing. The default is a space (sep=' '), this function call ensures that there is no space between Property charge: $ and the organized tax floating-point value.
Look at the output of the following three print() calls to see the distinction
>>> print('foo', 'bar')
foo bar
>>> print('foo', 'bar', sep='')
foobar
>>> print('foo', 'bar', sep=' -> ')
foo -> bar
sep argument value changed everything.
Using \t or a space as print seperator will shows the difference
>>> print('eggs', 'ham')
eggs ham
>>> print('eggs', 'ham', sep='\t')
eggs ham
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