Summary
Lists the replicas in the workspace.
Discussion
You can specify the path to a connection file as an argument to the function or you can set the workspace environment to the connection file and call the ListReplicas function without any arguments.
Syntax
ListReplicas (workspace)
| Parameter | Explanation | Data Type | 
| workspace | A geodatabase workspace. | String | 
Code sample
For every replica in a workspace that is a sender, call Export Data Change Message.
import arcpy
import os
sdeConnection = "Database Connections/toolboxDEFAULTVersion.sde"
outLocation = "c:/data"
for replica in arcpy.da.ListReplicas(sdeConnection):
    # If the replica is a sender, call ExportDataChangeMessage
    #
    if replica.isSender:
        changesFile = os.path.join(outputLocation,
                                   "changes_{0}.gdb".format(replica.name))
        arcpy.ExportDataChangeMessage_management(sdeConnection,
                                                 changes,
                                                 replica.name)Print all replicas that are in conflict.
import arcpy
sdeConnection = "Database Connections/toolboxDEFAULTVersion.sde"
# Print the name of the replicas that are in conflict
#
for replica in arcpy.da.ListReplicas(sdeConnection):
    if replica.hasConflicts:
        print(replica.name)