Make caption with multiple colors in moviepy

colored_word.py

# Import everything needed to edit video clips
from moviepy.editor import *
from vectortween.PointAnimation import PointAnimation

fps = 25
duration = 10
W = 2000
H = 500

# Generate a text clip
txt_clip = TextClip(
    'Fun <b>with</b> <span foreground="#FF4567" background="black" size="x-large"><tt><i>captions</i></tt></span>!',
    font="DejaVu Mono Sans", fontsize=75, color='white', method="pango", size=(W, H))

# setting position of text in the center and duration will be 10 seconds
end_x_offset = 0
end_y_offset = H / 2

na_pt = PointAnimation((0, 0), (end_x_offset, end_y_offset), tween=['easeOutBounce'], ytween=['easeOutBounce'])

def position(t):
    df = duration * fps
    tf = t * fps
    return na_pt.make_frame(tf, 0, 0, df / 4, df, None)


final_txt_clip = txt_clip.set_position(position).set_duration(duration)

# Overlay the text clip on the first video clip
video = CompositeVideoClip([final_txt_clip])

# showing video
video.write_videofile("test.mp4", fps=fps)