add example of grpc client

veelion

2023-03-27 fb06c50b11cf4e5e3a55fc62a60f595f2549ff76

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# -*- coding: utf-8 -*-
 
 
try:
    strtype = basestring
except NameError:
    strtype = str
 
 
def to_s(val):
    try:
        return unicode(val)
    except NameError:
        return str(val)