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I want to craft packets using scapy. When looking through the IP() class members I came across the following code idiom:

'fieldtype': { 'frag': <Field (IP,IPerror).frag>, 'src': <Field (IP,IPerror).src>, 'proto': <Field (IP,IPerror).proto>, 'tos': <Field (IP,IPerror).tos>, 'dst': <Field (IP,IPerror).dst>, 'chksum': <Field (IP,IPerror).chksum>, 'len': <Field (IP,IPerror).len>, 'options': <Field (IP,IPerror).options>, 'version': <Field (IP,IPerror).version>, 'flags': <Field (IP,IPerror).flags>, 'ihl': <Field (IP,IPerror).ihl>, 'ttl': <Field (IP,IPerror).ttl>, 'id': <Field (IP,IPerror).id>}, 'time': 1465637588.477862, 'initialized': 1, 'overloaded_fields': {},

I am relatively new to Python. Can someone explain to me what purpose the angle brackets serve in each field type definition?

I have been trying to figure out this myself using the following documentation but got completely stuck.

Scapy 2.3.1

Thanks

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    It's just string representation of object, not actual Python syntax. Commented Jun 11, 2016 at 10:29

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repr when applied to a Field instance uses the following definition for __repr__ which is the source of the not Python syntax.

def __repr__(self): return "<Field (%s).%s>" % (",".join(x.__name__ for x in self.owners),self.name)
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