Question

我现在已经苦苦挣扎了很长时间，仍然无法使这行代码正常工作：

os.system('su - postgres -c "psql -c \'ALTER USER postgres WITH ENCRYPTED PASSWORD \\\"{0}\\\";\'"'.format(self.password))

并记录结果：

2013-11-12 19:58:42 ICT ERROR:  syntax error at or near ""password"" at character 45
2013-11-12 19:58:42 ICT STATEMENT:  ALTER USER postgres WITH ENCRYPTED PASSWORD "password";

有什么想法吗？

Answer 1

Urgh。如果可能的话，请使用psycopg2，PostgreSQL的本机Python客户端驱动程序。

如果您必须转发至psql，请使用subprocess模块的check_call功能，这样可以更轻松，更安全地为您进行报价。

import subprocess
subprocess.check_call([
    'psql', '-c',
    'ALTER USER postgres WITH ENCRYPTED PASSWORD "{0}";'.format(self.password)
])

os.system应该是IMO的最后手段。

Answer 2

密码应该是单引号 -

postgres=# create user usr with password "password";
ERROR:  syntax error at or near ""password""
LINE 1: create user usr with password "password";
                                      ^
postgres=# create user usr with password 'password';
CREATE ROLE

带有嵌入式命令的os.system

2 个答案: