file = open ("home / chronos / user / Downloads / data.csv", "w", encoding = "UTF-8")
file.write ("t (s), y1 (m), y2 (m), v1 (m / s), v2 (m / s), a1 (m / s ^ 2), a2 (m / s ^ 2 ) \ n ")
and this one inside:
file.write (str (t) + "," + str (b1.pos.y) + "," + str (b2.pos.y) + "," + str (b1.vy) + "," + str (b2.vy) \
+ "," + str (b1.a.y) + "," + str (b2.a.y) + "\ n")
file.close ()