Question

I am trying to create a triangle which takes in user inputted values and from the values would like to find the maximum route in these inputs. I intitally asked the question to find the maximum route in this: Finding the Maximum Route in a given input

Code:

def triangle(rows):
    for rownum in range (rows):
        PrintingList = list()
        print ("Row no. %i" % rownum)
        for iteration in range (rownum):
            newValue = input("Please enter the %d number:" %iteration)
            PrintingList.append(int(newValue))
            print()
def routes(rows,current_row=0,start=0):
    for i,num in enumerate(rows[current_row]):
        #gets the index and number of each number in the row
        if abs(i-start) > 1:   # Checks if it is within 1 number radius, if not it skips this one. Use if not (0 <= (i-start) < 2) to check in pyramid
            continue
        if current_row == len(rows) - 1: # We are iterating through the last row so simply yield the number as it has no children
            yield [num]
        else:
            for child in routes(rows,current_row+1,i): #This is not the last row so get all children of this number and yield them
                yield [num] + child


numOfTries = input("Please enter the number of tries:")
Tries = int(numOfTries)
for count in range(Tries):
    numstr= input("Please enter the height:")
    rows = int(numstr)
    triangle(rows)
    routes(triangle)
    max(routes(triangle),key=sum)

The error i get after inputting all my values for triangle:

Traceback (most recent call last):
  File "C:/Users/HP/Desktop/sa1.py", line 25, in <module>
    max(routes(triangle),key=sum)
  File "C:/Users/HP/Desktop/sa1.py", line 10, in routes
    for i,num in enumerate(rows[current_row]): #gets the index and number of each number in the row
TypeError: 'function' object is not subscriptable

Where is my error in my code? Need some help.. Thanks…

Answer 1

You are probably trying ot get the value of PrintingList, created inside the triangle function as the rowsvariable inside the routes function.

For your program to work that way you have to add a return statement in your triangle function – that is, add a return PrintingList as the last statement there – and store this value when you call the function, and pass the stored value to the routes function – which means, the ending of your program should read something like:

result = triangle(rows)
routes(result)
max(routes(triangle),key=sum)

That will fix this problem, there may be other issues in the code above.