I have below list
list_of_dict = [{'flat': ['103'], 'wing': u'C'}, {'flat': ['102', '104'], 'wing': u'B'}, {'flat': ['105'], 'wing': u'D'}]
list_of_dict = [{'flat': [{'103'}], 'wing': u'C'}, {'flat': [{'102'}, {'104'}], 'wing': u'B'}, {'flat': [{'105'}], 'wing': u'D'}]
The following does exactly what you want,
list_of_dict = [{'flat': ['103'], 'wing': u'C'}, {'flat': ['102', '104'], 'wing': u'B'}, {'flat': ['105'], 'wing': u'D'}]
for e in list_of_dict:
e['flat'] = [{x} for x in e['flat']]
print(list_of_dict)
Update: The following code should work based on your comment below,
list_of_dict = [{'flat': ['103'], 'wing': u'C'}, {'flat': ['102', '104'], 'wing': u'B'}, {'flat': ['105'], 'wing': u'D'}]
for e in list_of_dict:
e['flat'] = ['{'+x+'}' for x in e['flat']]
print(list_of_dict)