systems = [
{"book_type": "python", "book_name": "python小册"},
{"book_type": "python", "book_name": "python学习手册"},
{"book_type": "python", "book_name": "python编程"},
{"book_type": "java", "book_name": "java编程实战"},
{"book_type": "java", "book_name": "java并发编程"},
]
from operator import itemgetter
from itertools import groupby
for book_type, item in groupby(systems, key=itemgetter("book_type")):
print(book_type)
for i in item:
print(" ", i)
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