Writing Pig UDF function using Python. Details at http://sudarmuthu.com/blog/writing-pig-udf-functions-using-python

function.py

def get_length(data):
    return len(data)

function2.py

@outputSchema("num:long")
def get_length(data):
    return len(data)

python_udf.pig

REGISTER 'udf.py' USING jython as pyudf

A = LOAD 'data.txt' USING PigStorage();
B = FOREACH A GENERATE $0, pyudf.get_length($0);

DUMP B;

udf.py

@outputSchema("num:long")
def get_length(data):
    str_data = ''.join([chr(x) for x in data])
    return len(str_data)