l = [1,2,3,3,3,44,4,4,1] print(set(l)) s = set() s = {1,2,3,4} def my(name,sex='男'): #形式参数 print('hahaha',name) return name my('111')#实际参数 def read_file(file_name): with open(file_name,encoding='utf-8') as f: return f.read() import datetime def welco