#testmode:repl

to5 = range(5)

for i in to5 print(i)
for i in to5.rev print(i)
for i in to5.rev print(i)

to10by2 = range(0, 10, 2)
for i in to10by2 print(i)
for i in to10by2.rev print(i)

#---
#0
#1
#2
#3
#4

#4
#3
#2
#1
#0

#0
#1
#2
#3
#4

#0
#2
#4
#6
#8

#8
#6
#4
#2
#0