Given a file ``data.txt`` with three columns of data separated by spaces, read it into one complex sequence.

Here is a step-by-step guide on how to read a file with three columns of data separated by spaces into one complex sequence using Python:

1. Import the necessary libraries:

import numpy as np

2. Use the numpy function loadtxt to read the file. This function returns the data in the file as a 2D array:

data = np.loadtxt('data.txt')

3. The data is now stored in the data variable as a 2D array. Each row of the array corresponds to a line in the file, and each column corresponds to a column in the file.

4. If you want to combine the three columns into one complex sequence, you can do so by using the complex function in a list comprehension. This function takes two arguments: the real part and the imaginary part of the complex number. Here, we'll use the first column as the real part and the second and third columns as the imaginary part:

complex_sequence = [complex(a, b+c) for a, b, c in data]

5. The variable complex_sequence now contains a list of complex numbers, where each number is created from three columns in the file.

Please note that this assumes that the data in your file is numeric. If it's not, you'll need to convert it to numbers before you can use it to create complex numbers.