Generating numbers

[darktitan]

Hi
Im trying to generate number sequence who i want to look like this.

7-1-1234
8-2
9-3
10-4
11-5
12-6
13-7-1234

But instead it looks like this.

7-1-1234






13-7-1234

Here is my code.

value1 = (1234)
value2 = (7)
value3 = (7)

for parts in range(value2):
    print(("{}-{}".format(value3 + parts, parts+1) + '-{}\n'.format(value1) if parts in [0, value2 - 1] else ''))

What am i missing and doing wrong?