<human>:  numpy loadtxt header.
<bot>: Here is a Python function to numpy loadtxt header

import numpy as np

def loadtxt_header(filename):
  """Returns the header of a numpy loadtxt file."""
  with open(filename, 'r') as f:
    return f.readline().strip()

# Enter the filename
filename = "test.txt"

# Calling the function
print((loadtxt_header(filename)))

#Example Output
# This is a test.

#Remember to inspect code for bugs.