sort_message_by_field_value.py

import operator
from netzob.all import *

data = ["hello bernard !", "hello albert !", "hello netzob !"]

messages = [RawMessage(d) for d in data]

f0 = Field(ASCII("hello "))
f1 = Field(ASCII(nbChars=(1,20)))
f2 = Field(ASCII(" !"))

s = Symbol(fields = [f0, f1, f2])
s.messages = messages

print(s)

# Field    | Field     | Field
# -------- | --------- | -----
# 'hello ' | 'bernard' | ' !' 
# 'hello ' | 'albert'  | ' !' 
# 'hello ' | 'netzob'  | ' !' 
# -------- | --------- | -----

sorted_x = sorted(f1.getMessageValues().items(), key=operator.itemgetter(1))

for message, field_value in sorted_x:
    print(field_value, " | ", message.data)
    
# b'albert'  |  hello albert !
# b'bernard'  |  hello bernard !
# b'netzob'  |  hello netzob !

For nicer output on binary protocols:

for message, field_value in sorted_x:
    print(TypeConverter.convert(field_value, Raw, HexaString), " | ", TypeConverter.convert(message.data, Raw, HexaString))