Question

当我运行下面的代码时，迭代从0开始。我想将行更改为从第1行开始。我如何更改它？我尝试在迭代开始之前输入rownum = 1。

代码：

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)

输出：

Please enter the number of tries:2
Please enter the height:4
Row no. 0
Row no. 1
Please enter the 0 number:

感谢任何帮助。

Answer 1

变化：

for rownum in range (rows):

为：

for rownum in range (1, rows+1):

Answer 2

range()也可以采用起始值：range(1, rows+1)

有关详细信息，请参阅Python Docs

Answer 3

更改此行：

for rownum in range (rows):

分为：

for rownum in range (1, rows+1):

Answer 4

只需更改

def routes(rows,current_row=0,start=0):

到

def routes(rows,current_row=1,start=1):

迭代从0开始

4 个答案: