Hey guys, I’m new to python and in the past 2 days, I’ve been trying to learn how to code python.

after getting used to some topics, I came across loops and nested loops which I find really confusing especially when there’s a loop inside a loop.

One exercise I tried to get my head around is constructing a pattern using for loops.

Here is an example:

```
n=5;
for i in range(n):
for j in range(i):
print ('* ', end="")
print('')
for i in range(n,0,-1):
for j in range(i):
print('* ', end="")
print('')
```

which gives an output:

```
*
* *
* * *
* * * *
* * * * *
* * * *
* * *
* *
*
```

I can’t get my head around how it’s doing this. I know that ‘i’ goes through the range n = 1,2,3,4,5. but what does it mean when j loops to the range i?

regarding range(n,0,-1). I assume it’s n =5 to range 0 and increment by -1?

also is there another way of doing this so that it looks easier for a beginner or is ‘readable’?

However, I do understand the output when comparing 2 lists together such as this:

```
list1= [1,2,3,4]
list2= ['a','b','c','d']
for i in list1:
for j in list2:
print(i,j)
```

giving an output of

```
1 a
1 b
1 c
1 d
2 a
2 b
2 c
2 d
3 a
3 b
3 c
etc..
```

I just can’t get my head around what happens when there’s no lists to compare