I came up with this code for pattern generation which is confusing me. What does the second for loop-CodePudding

rows =6
for num in range(rows):
    for i in range(num): 
        print(num,end=' ')
    print(' ')

The second for loop is doing something to num which I don't understand.

Output:

CodePudding user response：

The second, or 'inner', for loop isn't doing anything to num besides using it to generate a range of values from 0 to num-1. It also prints out the value of num at each iteration.

The first, or 'outer', for loop is assigning all the values from 0 to rows-1 to the variable num. The value assigned to num by the outer loop at each iteration is used by the inner loop.

CodePudding user response：

The second loop is printing the value of num for the range of num it basically works like this

for i in range(3):
  print(3, end=" ")

which will print out

3 3 3

rows =6
for num in range(rows):
    for i in range(num): 
      #the second loop iterates over num and each time prints the value num 
        print(num,end=' ')
    print(' ')