How to use wildcards with Envoy

问题

I'm trying to run this command through KennethReitz's Envoy package:

$ sqlite3 foo.db 'select * from sqlite_master' 

I've tried this:

r = envoy.run("sqlite3 foo.db 'select * from sqlite_master'")
sqlite3: Error: too many options: "*"

and this:

r = envoy.run(['sqlite3', 'foo.db', 'select * from sqlite_master'])
AttributeError: 'NoneType' object has no attribute 'returncode'

additional quoting & escaping doesn't seem to help. Any suggestions?

FYI: This is what I had to do for now:

cmd = "sqlite3 %(database)s 'select * from sqlite_master'" % locals()
os.system(cmd)

Note that this is a contrived example, and that most of the unix shell commands that I'd like to issue aren't just a simple select that could be easily done via SQLAlchemy.

回答1:

You could use subprocess:

from subprocess import check_output as qx

output = qx(['sqlite3', 'foo.db', 'select * from sqlite_master'])
print output

Or sqlite3 module:

import sqlite3

conn = sqlite3.connect('foo.db')
for row in conn.execute('select * from sqlite_master'):
    print row

If you still want to use envoy then you could fix it as:

import envoy

r = envoy.run([["sqlite3", "foo.db", "select * from sqlite_master"]])
print r.std_out

回答2:

This will not work in envoy because envoy splits the commands and pass them to subprocess. Even if you try with subprocess.Popen(command, shell = False) you will end up getting sqlite3 terminal. Both subprocess and envoy fails to address this, I will be happy if you can open an issue in envoy since I am contributing to it, I will be thinking about this.

来源：https://stackoverflow.com/questions/9106350/how-to-use-wildcards-with-envoy