<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_env_str(env):
 """ Gets a string representation of a dict as though it contained environment variable values. """

    return ' '.join("{0}='{1}'".format(k, v) for k, v in env.items())