JSON出力を解析する方法は？

Question

JSON形式で出力されたコマンドの出力を解析し、以下のエラーが発生していますか？コマンドの出力例を提供しました。

import subprocess,json 
user = 'user1' 
gerrit = '1234567' 
branch_cmd = "ssh -l %s -p 29418 review-android.quicinc.com gerrit query %s --format=JSON"%(user,gerrit) 
proc = subprocess.Popen(branch_cmd.split(' '), stdout=subprocess.PIPE, stderr=subprocess.PIPE) 
(output, error) = proc.communicate() 
print output["branch"] 

OUTPUT： -

{"project":"platform/system/technology","branch":"technology.lnx.2.1-dev","topic":"","id":"Id1ca6a5167c8e7269b154824e5a5dd2389a2d1cf","number":"1234567","subject":"Bluetooth:HOGP Write Scan Interval Window characteristic","owner":{"name":"Firstname Kumar name","email":"sname@sub.comp.com","username":"sname"},"url":"https://review-android.company.com/1234567","createdOn":1471052441,"lastUpdated":1480706360,"sortKey":"004195870019d68b","open":false,"status":"ABANDONED"} 
{"type":"stats","rowCount":1,"runTimeMilliseconds":1} 

ERROR： -

File "strip_dev_rel.py", line 10, in <module> 
    print output["branch"] 
TypeError: string indices must be integers, not str 

Answer 1

次のように、JSONに文字列を変換する必要があります。

for line in output.split('\n'): 
    print json.loads(line) 

最初にアクセスするには1つ：

line1 = output.split('\n')[0] 
print json.loads(line)["branch"]