Human: Python code to stack 2d arrays in 2d array. Assistant: 
Here is a Python code to stack 2d arrays in a Python program

import numpy as np

def stack_2d_arrays(arrays):
    """Stack 2d arrays in."""
    assert isinstance(arrays, (list, tuple))
    assert all(isinstance(a, np.ndarray) for a in arrays)
    assert all(a.ndim == 2 for a in arrays)
    return np.stack(arrays)

# Enter the list of 2d arrays
arrays = [np.array([[1, 2], [3, 4]]), np.array([[5, 6], [7, 8]])]

# Calling the function
stacked_array = stack_2d_arrays(arrays)

# Printing the result
print(stacked_array)

#Example Output
# [[[1 2]
#   [3 4]]
#  [[5 6]
#   [7 8]]]

#Remember to inspect code for bugs.