y=1000000
for x in range(y):
    if x % 100000 == 0 and x!=0 or x==y :
        print "  Iteration %d out of %dr" % (x,y)

Iteration 100000 out of 1000000
  Iteration 200000 out of 1000000
  Iteration 300000 out of 1000000
  Iteration 400000 out of 1000000
  Iteration 500000 out of 1000000
  ...

for x in range(1000000):
        print "%dr" % x,

print s ,

print "  Iteration %d out of %dr" % (x,y) ,

print x,           # 2.x: Trailing comma suppresses newline
print(x, end="")   # 3.x: Appends a space instead of a newline

sys.stdout.write("  Iteration %d out of %dr" % (x,y))