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            in i  row we need nUpper-i leading spaces. The leading spaces are followed by two asterisks, separated by an
            appropriate number of spaces. To draw the inverted isosceles triangle, the number of leading spaces decreases by one
            in each subsequent row. We incorporate these details into the following program.
              01 '''
              02 Objective: To display the hollow diamond
              03 Inputs:
              04     nRows : number of rows
              05     symbol: symbol to be printed
              06 Output: Hollow diamond of symbols
              07 '''
              08
              09 nRows = int(input('Enter the number of rows (odd number): '))
              10 symbol = input('Enter Symbol: ')
              11
              12 assert nRows%2==1, 'A diamond must have odd no of rows'
              13 # Upper part of hollow diamond
              14 nUpper = nRows//2 +1
              15 for i in range(1, nUpper+1):
              16     print(' ' * (nUpper-i), end = '')
              17
              18     for j in range(1, 2*i):
              19         if j==1 or j==2*i-1:
              20             print(symbol, end = '')
              21         else:
              22             print(' ', end = '')
              23     print()
              24
              25 # Lower part of hollow diamond
              26 nInverted = nRows//2
              27 for i in range(nInverted,0,-1):
              28     print(' ' * (nInverted-i+1), end = '')
              29
              30     for j in range(1, 2*i):
              31         if j==1 or j==2*i-1:
              32             print(symbol, end = '')
              33         else:
              34             print(' ', end = '')
              35     print()
            Sample Output:
             >>> Enter the number of rows (odd number): 11
             >>> Enter Symbol: *
                        *
                      *   *
                    *       *
                   *         *
                  *           *
                 *             *
                  *           *
                   *         *
                    *       *
                      *   *
                        *
            6.7.4 Partial Dry Run

              01 i = 1
              02     print 6-1=5 spaces



                                                                                              Looping in Python  147
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