Please i need someone to help me explain this code from line 1 to the last line. I just came across it but i don't understand it

Question

def pascals_triangle (number):
for i in range (number+1):
a= " "
for j in range (number-i):
a=a + " "
for k in range (i):
a=a + "3"
Print (a)

pascals_triangle (5)

Results:
3
3 3
3 3 3
3 3 3 3
3 3 3 3 3

Answer 1

If number=5 then,
First line print as below:
i=0
a=" "
at second for loop,
j=0 then,
a=" "+" " (because before a=" ")
Now,a=" " (two spaces)
j=1 then,
a=" " (three spaces)
j=2 then,
a=" " (four spaces)
j=3 then,
a=" " (five spaces)
j=4 then,
a=" " (six spaces)
At third for loop,
Nothing do because i=0.
First line has six spaces.
i=1
a=" "
at second for loop,
j=0 then,
a=" "+" " (because before a=" ")
Now,a=" " (two spaces)
j=1 then,
a=" " (three spaces)
j=2 then,
a=" " (four spaces)
j=3 then,
a=" " (five spaces)
At the third for loop
K=0 then,
a=" "+" 3"(space before3)
Therefore
a=" 3"
Second line ptints ' 3'
i=2
a=" "
at second for loop,
j=0 then,
a=" "+" " (because before a=" ")
Now,a=" " (two spaces)
j=1 then,
a=" " (three spaces)
j=2 then,
a=" " (four spaces)
At the third for loop
K=0 then,
a=" "+" 3"
K=1 then,
a=" 3 3"
Therefore
a=" 3 3"
Third line ptints ' 3 3'
Like above,
The output is,

3
3 3
3 3 3
3 3 3 3
3 3 3 3 3

Answer 2

Wow.. Thank you very much. This is really helpful