Adjacent colors are obtained by rotating 30 and 360 degrees of any given color from the color wheel.

Below is the Python code to achieve the same. The input supplied is Hex value of color and output is the list of two adjacent colors (Hex value).

# Import colorsys
import colorsys

# Module to convert rgb to hex
def rgb_to_hex(rgb):
    return '#%02X%02X%02X' % (rgb)

# Module to convert hex to rgb
def hex_to_rgb(value):
    value = value.lstrip('#')
    return tuple(int(value[i:i+2], 16) for i in (0, 2 ,4))

# This module gets the adjacent colors.
# They can be obtained by rotating the color by 30 and 360
# degrees.
def get_adjacent(color):
    # List to hold two colors
    adjacent_colors = []

    # Get the RGB
    (r, g, b) = hex_to_rgb(color)

    # Set the degree
    d = 30/360

    # Values has to be between 0 to 1
    r = r / 255.0
    g = g / 255.0
    b = b / 255.0

    # Convert to HLS using colorsys
    h, l, s = colorsys.rgb_to_hls(r, g, b)

    # Rotate the color
    h = [(h+d) % 1 for d in (-d, d)]

    # For both the colors, convert back to RGB and
    # load to list
    for hi in h:
        r, g, b = colorsys.hls_to_rgb(hi, l, s)
        r = r * 255.0
        g = g * 255.0
        b = b * 255.0
        hex_val = rgb_to_hex((r,g,b))

        adjacent_colors.append(hex_val)

    # Print the list
    print(adjacent_colors)

# Supply the input with required hex value.
get_adjacent("#FF0000")