twitter-algorithm-ml/machines/list_ops.py

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"""
Simple str.split() parsing of input string
usage example:
python list_ops.py --input_list=$INPUT [--sep=","] [--op=<len|select>] [--elem=$INDEX]
Args:
- input_list: input string
- sep (default ","): separator string
- elem (default 0): integer index
- op (default "select"): either `len` or `select`
- len: prints len(input_list.split(sep))
- select: prints input_list.split(sep)[elem]
Typical usage would be in a bash script, e.g.:
LIST_LEN=$(python list_ops.py --input_list=$INPUT --op=len)
"""
import tml.machines.environment as env
from absl import app, flags
FLAGS = flags.FLAGS
flags.DEFINE_string("input_list", None, "string to parse as list")
flags.DEFINE_integer("elem", 0, "which element to take")
flags.DEFINE_string("sep", ",", "separator")
flags.DEFINE_string("op", "select", "operation to do")
def main(argv):
split_list = FLAGS.input_list.split(FLAGS.sep)
if FLAGS.op == "select":
print(split_list[FLAGS.elem], flush=True)
elif FLAGS.op == "len":
print(len(split_list), flush=True)
else:
raise ValueError(f"operation {FLAGS.op} not recognized.")
if __name__ == "__main__":
app.run(main)