[英]Python how to apply classes correctly
我編寫了以下類和程序:
class Coordinate(object):
def __init__(self,x,y):
self.x_coordinate = x
self.y_coordinate = y
class CoordinatRow(object):
def __init__(self):
self.coordinaterow = []
def add_coordinaterow(self, coordinate):
self.coordinaterow.append(coordinate)
def weave(self,other):
lijst = []
for i in range(len(self.coordinaterow)):
lijst.append(self.coordinaterow[i])
lijst.append(other.row[i])
coordinaterow = lijst
print coordinaterow
程序:
from Coordinates import Coordinate, CoordinatRow
from ipy_lib import file_input
'''functies'''
def split_and_add(invoer):
rij = invoer.split('=')
for line in rij:
process_row(line)
def process_row(line):
temp_coordinate_row = CoordinatRow()
rij = line.split()
for coordinate in rij:
coor = process_coordinate(coordinate)
temp_coordinate_row.add_coordinaterow(coor)
return temp_coordinate_row
def process_coordinate(coordinate):
idunno = coordinate.split(',')
return Coordinate(int(idunno[0]),int(idunno[1]))
'''programma'''
bestand = file_input()
split_and_add(bestand)
rows = split_and_add(bestand)
for row in rows:
row.weave(row)
輸入如下所示:
5,4 4,5 8,7=6,3 3,2 9,6 4,3=7,6=9,8=5,5 7,8 6,5 6,4
Ech行用=
分隔。 我想像這樣將每一行與下一行編織在一起:
5.4, 4.5, 8.7 weave with 6.3, 3.2, 9.6, 4.3
5.4, 6.3, 4.5, 3.2, 8.7, 9.6, 4.3
並將下一行插入此新行。
問題出在我上課的方式上。 我收到此錯誤:
for row in rows:
TypeError: 'NoneType' object is not iterable
這是怎么了?
def split_and_add(invoer):
rij = invoer.split('=')
for line in rij:
yield process_row(line)
如果您不想使用yield
def split_and_add(invoer):
rij = invoer.split('=')
rows = []
for line in rij:
rows.append(process_row(line))
return rows
對於第二個問題,您可能需要執行以下操作:
for row in range(0,len(rows)-1):
rows[row].weave(rows[row+1])
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