names = ['Alice', 'Bob', 'Candy', 'David', 'Ellena']

name_set = str(set(names)).lower()

print('alice' in name_set)

names?=?['Alice','alice',?'Bob',?'Candy',?'David',?'Ellena']
name_set?=?set(names)
name1?=?'bob'
for?i?in?name_set:
?????if?name1.lower()?==?i.lower():
?????????print(True)
?????else:
?????????print(False)

可以遍歷集合name_set,將name_set中的元素都轉化為小寫,然后在進行判斷.例如查看name1 = 'bob'是否在集合中

names?=?['Alice','alice',?'Bob',?'Candy',?'David',?'Ellena']
name_set?=?set(names)
name1?=?'bob'
for?i?in?name_set:
????if?name1.lower()?==?i:
????????print(True)
????else:
????????print(False)