def underline_to_camel(underline_format):
word_set = underline_format.split('_')
if len(word_set) == 1:
return underline_format
camel_format = ''
for i in range(len(word_set)):
if i == 0:
continue
word_set[i] = word_set[i].capitalize()
return ''.join(word_set)
print underline_to_camel(‘aaa’)
print underline_to_camel(‘aaa_bbb’)
print underline_to_camel(‘aaa_bbb_ccc’)
