readline() 方法给出错误：属性错误：'tuple'对象没有属性'readline'

Question

我正在使用jsonstreams。Stream方法使用Python 2.7将数据输入到json文件中，但我在尝试使用readline((方法从PIPE输入读取数据时出错。该错误表示AttributeError:"tuple"对象没有属性"readline"。

branch_name = 'man/ashish_c/robotics'
days = '60'
json_output = 'output_log.json'
proc = subprocess.Popen(['git', 'log', branch_name, '--since="60 days ago"', '--pretty=%pt%ht%ant%st%b'], shell=True, stdout=subprocess.PIPE)
stdout_value = proc.communicate()
with jsonstreams.Stream(jsonstreams.Type.array, filename=json_output) as output:
while True:
line = stdout_value.readline()
if not line:
break
record = line.decode("utf-8").split("t")
with output.subobject() as output_e:
output_e.write('merge', record[0])
output_e.write('commit', record[1])
output_e.write('author', record[2])
output_e.write('title', record[3])
output_e.write('body', record[4])

我希望output_log.json的内容看起来像这样：

[
{"commit": "3011203d", "merge": "e84d9feb", "author": "me", "title": "test commit", "body": "..."},
{"commit": "5033203d", "merge": "u67d9feb", "author": "Dmitri", "title": "check infra", "body": ".."}
.....
]

Answer 1

Popen.communicate()返回一个(stdout_data, stderr_data)的元组。看见https://docs.python.org/3/library/subprocess.html#subprocess.Popen.communicate

假设您想从stdout_data读取，请尝试替换行

stdout_value = proc.communicate()

带有

stdout_value, stderr_value = proc.communicate()