Open Stack

Unable to set Environment variables like *OS_USERNAME, OS_PASSWORD,
OS_TENANT_NAME, OS_REGION_NAME, OS_AUTH_URL* during run time through for
example *os.system("source openrc demo demo")* ,in order to run commands
for demo project like *ceilometer event-list*. Actually I am unable to get
demo's project events from admin credentials set and could not change to
demo credentials in my logic.

Instead getting error sh: 1: source: not found on executing source openrc
demo demo command
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