unicode_thing = u"Xin chào mọi người"
a = '{}'.format(unicode_thing)

will cause the error UnicodeEncodeError: 'ascii' codec can't encode character u'\xe0' in position 6: ordinal not in range(128)

The solution is add u prefix the pattern (it means using unicode pattern) :

unicode_thing = u"Xin chào mọi người"
a = u'{}'.format(unicode_thing)

Reality, if using function on indexed field, you will broke indexing by accident.
Eg:

WHERE MONTH(`date`) = 11 AND YEAR(`date`) = 2015

Solution is transform the query to comparison query, like this :

WHERE `date` >= '2015-11-01' AND `date` < '2015-12-01'

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