Python无法从有效的yam解析对象列表

Question

我有yaml配置：

base: /tmp
tasks: 
  - 
    drop: true
    dump_src: "some string here"
    dump_ts: "some string here"
    region: ME
  - 
    dump_src: "some string here"
    dump_ts: "some string here"
    region: RU

它通过了http://yaml-online-parser.appspot.com/和http://www.yamllint.com/验证

但当我尝试时：

import yaml

if __name__ == "__main__":
    stream = open(sys.argv[0], 'r')
    docs = yaml.load_all(stream)
    for doc in docs:
        print doc

我有个错误：

yaml.scanner.ScannerError: mapping values are not allowed here
  in "/opt/projects/nextgis/gazetteer-update/gup-web.py", line 7, column 40

Answer 1

发现我的错误：

stream = open(sys.argv[0], 'r')

sys.argv[0]是python脚本本身，所以我尝试解析脚本，而不是yaml配置

正确的arg值位于索引1下：

stream = open(sys.argv[1], 'r')