以下程序实现：把'xiaoming'的个人信息填到family的csv文件中，再读取出来。空格处应填？（ ）
import json
import csv
fam = {'name':'xiaoming','age':18,'gender':'nan'}
with open('family.csv','w') as f:
json. (fam,f)
with open('family.csv','r') as f1:
read1 = json. (f1)
print(read1
reader,writer
writer,reader
dump,load
load,dump