SPACE INVADERS 7

Move the aliens back and forth:

...

alien_direction = 1

alien_speed = 1

...



while True:

...

# Move alien

if now - alien_start_time > ALIENS_STEP_TIME / alien_speed:

alien_at_right_side = alien_direction > 0 and max(alien_columns) == fb.width - 1

alien_at_left_side = alien_direction < 0 and min(alien_columns) == 0

if alien_at_left_side or alien_at_right_side:

alien_row -= 1

alien_speed *= 1.3

alien_direction = - alien_direction

if alien_row == 0:

break

else:

alien_columns = [column + alien_direction for column in alien_columns]

...


Full project:

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