下载json文件

点击这里进入下载页面，右键从链接另存文件

获得的json文件如图：

python中json的基本操作

JSON (JavaScript Object Notation) 是一种轻量级的数据交换格式，在python中可使用json包进行解码与编码，主要涉及四个方法：load, loads, dump, dumps。

  • json.loads：将json字符串解码为python对象
  • json.dumps：将python对象编码为json字符串
  • json.load和json.dump：分别与json.loads, json.dumps的功能对应，但需要传入文件描述符，对文件进行操作
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import json

with open('test.json', 'r', encoding='utf-8') as f:
    dict = json.load(f)
# 等同于：
with open('test.json', 'r', encoding='utf-8') as f:
    dict = json.loads(f.read())

解析ko00001.json

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import os
import json
import re

class KOParser(object):
	def __init__(self, map):
		self.map = map

	def json_parser(self):
		# check the existance of json file
		if os.path.exists(self.map):
			with open(self.map, 'r') as f:
				ko_list = []
				# convert json to dict
				map_dict = json.load(f)
				# print(type(map_dict)) dict
				maps = map_dict['children']
				# print(type(maps)) list
				for map in maps:
					map_name = map['name'][0:5] + '\t' + map['name'][6:]
					# print(map_name)
					# print(type(map['children']))
					for map_l_1 in map['children']:
						map_l_1_name = map_l_1['name'][0:5] + '\t' + map_l_1['name'][6:]
						# print(map_l_1_name)
						for pathway in map_l_1['children']:
							try:
								for genes in pathway['children']:
									pathway_name = pathway['name'][0:5] + '\t' + pathway['name'][6:]
									# print(genes['name'])
									k_num = genes['name'].split(sep='  ')[0]
									gene_name = genes['name'].split(sep='  ')[1].split(sep=';')[0]
									anno = genes['name'].split(sep='  ')[1].split(sep=';')[-1]
									try:
										pattern = re.compile('(.*)(\[EC:.*\])')
										product = re.search(pattern, anno).group(1)
										ec = re.search(pattern, anno).group(2)
										ko = k_num + '\t' + gene_name + '\t' + product + '\t' + ec
									except:
										ko = k_num + '\t' + gene_name + '\t' + anno
									# print(ko)
									info = map_name + '\t' + map_l_1_name + '\t' + pathway_name + '\t' + ko
									ko_list.append(info)
							except:
								continue
				return ko_list
		else:
			print('Error: Json file does not exist.')

	def save_data(self, result, file_name):
		# convert list to string for writing as file
		for info in result:
			kos = ''.join(info) + '\n'
			with open(file_name, 'a', encoding='utf-8') as f:
				f.write(kos)


if __name__ == '__main__':
	map = 'ko00001.json'
	file_name = 'ko.txt'
	ko_json = KOParser(map)
	ko = ko_json.json_parser()
	ko_json.save_data(ko, file_name)