How to view c-message from azure service queue in Python

What do you mean about the contents of the c message?

I think the content of the c message you received is the date to send in the message. So according to the offical API reference Message class, you should use message.get_data() to get the body of the message to view its content, as the figure below.

Or just only to view it by print(...) like the sample code azure-uamqp-python/samples/sample_uamqp_receive_simple.py.

message = uamqp.receive_message(uri, auth=plain_auth)
print("Received: {}".format(message))

If your real intention is to parse the uamqp.c_uamqp.cMessage data structure of the massage to view the internal contents, you can refer to the SO thread Parsing C Structs in Python with the source codes message.h & message.c of Azure/azure-uamqp-c and the Python wrapper code message.pyx to try to parse it.

After I reviewed them above, the core data structure of uamqp.c_uamqp.cMessage is as below.

typedef struct MESSAGE_INSTANCE_TAG
{
    BODY_AMQP_DATA* body_amqp_data_items;
    size_t body_amqp_data_count;
    AMQP_VALUE* body_amqp_sequence_items;
    size_t body_amqp_sequence_count;
    AMQP_VALUE body_amqp_value;
    HEADER_HANDLE header;
    delivery_annotations delivery_annotations;
    message_annotations message_annotations;
    PROPERTIES_HANDLE properties;
    application_properties application_properties;
    annotations footer;
    uint32_t message_format;
} MESSAGE_INSTANCE;

Hope it helps.