reshape.py

#!/usr/bin/env python3

import sys

import numpy as np


arr = sys.stdin.read().split()
arr = np.array(arr)

for operation in sys.argv[1:]:
    if operation.startswith("."):
        if operation == ".T":
            arr = arr.T
        else:
            raise NotImplementedError
    else:
        shape = tuple(map(int, operation.split(",")))
        arr = arr.reshape(shape)

np.savetxt(sys.stdout.buffer, arr, fmt="%s")