Below is the syntax highlighted version of hadamard.py from §1.4 Arrays.

```#-----------------------------------------------------------------------
#-----------------------------------------------------------------------

import stdio
import stdarray
import sys

# Accept integer command-line argument n. Write to standard output
# the Hadamard matrix of order n. Assume that n is a power of 2.

n = int(sys.argv[1])

# Create the matrix.
H = stdarray.create2D(n, n, True)

# Initialize Hadamard matrix of order n.
i1 = 1
while i1 < n:
for i2 in range(i1):
for i3 in range(i1):
H[i2+i1][i3]    = H[i2][i3]
H[i2][i3+i1]    = H[i2][i3]
H[i2+i1][i3+i1] = not H[i2][i3]
i1 += i1

# Write the matrix.
for i in range(n):
for j in range(n):
if H[i][j]:
stdio.write('T ')
else:
stdio.write('F ')
stdio.writeln()

#-----------------------------------------------------------------------

# T T
# T F

# T T T T
# T F T F
# T T F F
# T F F T

# T T T T T T T T
# T F T F T F T F
# T T F F T T F F
# T F F T T F F T
# T T T T F F F F
# T F T F F T F T
# T T F F F F T T
# T F F T F T T F

# T T T T T T T T T T T T T T T T
# T F T F T F T F T F T F T F T F
# T T F F T T F F T T F F T T F F
# T F F T T F F T T F F T T F F T
# T T T T F F F F T T T T F F F F
# T F T F F T F T T F T F F T F T
# T T F F F F T T T T F F F F T T
# T F F T F T T F T F F T F T T F
# T T T T T T T T F F F F F F F F
# T F T F T F T F F T F T F T F T
# T T F F T T F F F F T T F F T T
# T F F T T F F T F T T F F T T F
# T T T T F F F F F F F F T T T T
# T F T F F T F T F T F T T F T F
# T T F F F F T T F F T T T T F F
# T F F T F T T F F T T F T F F T

```