Patterns-level-2

To understand codes in 'Patterns level 2' lets first revise some basic concepts.

Note:

• below, range(n) will provide starting 5 values when print(each) is called.

n = 5

for each in range(n):

print(each)

Note:

• below, range(n, 0, -1) will do the same thing of printing 5 values but, it does so in reverse order.
• output: (5,4,3,2,1), if n =5.
• or you can say it will provide starting 5 values, in reverse order with a difference of 1.
• That is: 5-1 = 4, 4-1 = 3.....and so on.

n = 5

for each in range(n, 0, -1):

print(each)

Note:

• range(-n+1,n), first the loop will run '-n+1', which results in: -5+1 = -4, -4+1 = -3....till 0.
• after this, loop will run 'n', which results in 0,1,2,3,4.

n = 5

for each in range(-n+1, n):

print(each)