This Python code snippet generates a pattern of numbers printed in a specific way. It consists of two nested loops within two separate outer loops.
rows = 8
for i in range(0, rows + 1):
for j in range(1, i):
print(j, end=" ")
print()
for i in range(rows + 1, 0, -1):
for j in range(1, i):
print(j, end=" ")
print()
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
rows = 8
rows
is initialized with the value 8
. This determines the number of rows for the pattern.for i in range(0, rows + 1):
for j in range(1, i):
print(j, end=" ")
print()
for i in range(0, rows + 1)
):i = 0
to i = 8
(inclusive). It controls the number of rows to be printed.for j in range(1, i)
):i
, this loop runs from j = 1
to j < i
. It prints numbers from 1
to i-1
.print(j, end=" ")
: Prints the value of j
followed by a space, without moving to a new line.print()
: Moves to the next line after completing the inner loop.i = 0
: The inner loop does not execute because the range is empty.i = 1
: The inner loop does not execute because the range is empty.i = 2
: The inner loop runs once, printing 1
.i = 3
: The inner loop runs twice, printing 1 2
.i = 8
, where the inner loop prints 1 2 3 4 5 6 7
.Resulting output for the first part:
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
for i in range(rows + 1, 0, -1):
for j in range(1, i):
print(j, end=" ")
print()
for i in range(rows + 1, 0, -1)
):i = 9
to i = 1
(exclusive), decrementing by 1
each time. It controls the number of rows to be printed in descending order.for j in range(1, i)
):i
, this loop runs from j = 1
to j < i
. It prints numbers from 1
to i-1
.print(j, end=" ")
: Prints the value of j
followed by a space, without moving to a new line.print()
: Moves to the next line after completing the inner loop.i = 9
: The inner loop runs eight times, printing 1 2 3 4 5 6 7 8
.i = 8
: The inner loop runs seven times, printing 1 2 3 4 5 6 7
.i = 2
, where the inner loop prints 1
.Resulting output for the second part:
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1