I'm working on a program to parse CSV files. I intend to read each line of each CSV file, order it in a manner that makes sense to me, then write it out to a new composite csv. For the purpose of illustrating the question i'm about to ask i have written the SSCE below:
when i run it without breakpoints i get the following error message:
File "/home/pi/Python code/CSV Read Write.py", line 23, in <module>
writer.writerow(lorder)
_csv.Error: iterable expected, not order
line 23 is the call to the writer.writerow(lorder) function
i looked on the internet and got the following AI generated python code to make my data class iterable. The problem is I do not fully understand what its doing and I hesitate to copy and paste without understanding
it appears that the _init_ (self,data)function has added a index value and set it to the integer 0, and added a data variable
It appears that the _iter_ (self)function merely returns itself to the calling function
it appears that the _next_(self) function (??????)
is it intended that each data structure created contains the index of the current element(row) and the total count of rows created? Do I need to keep track of these values within the main program? is there some other mechanism this code is interacting with of which I am unaware?
Code:
#this routine explores the use of the CSV read and write functions.import csvfrom datetime import dateclass order: def __init__(self, in_row ): self.Name = in_row[0] self.DOB = in_row[1] self.POB = in_row[2] self.OrderNo = in_row[3] self.Date = date.today() with open('/home/pi/Desktop/Test Data.csv', 'r') as infile: reader = csv.reader(infile) with open('/home/pi/Desktop/Test Out.csv','a')as outfile: writer = csv.writer(outfile) for row in reader: in_row = next(reader) lorder = order(in_row) writer.writerow(lorder)File "/home/pi/Python code/CSV Read Write.py", line 23, in <module>
writer.writerow(lorder)
_csv.Error: iterable expected, not order
line 23 is the call to the writer.writerow(lorder) function
i looked on the internet and got the following AI generated python code to make my data class iterable. The problem is I do not fully understand what its doing and I hesitate to copy and paste without understanding
Code:
class MyIterable: def __init__(self, data): self.data = data self.index = 0 def __iter__(self): return self def __next__(self): if self.index < len(self.data): value = self.data[self.index] self.index += 1 return value else: raise StopIteration# Example usagemy_object = MyIterable([1, 2, 3])for item in my_object: print(item)It appears that the _iter_ (self)function merely returns itself to the calling function
it appears that the _next_(self) function (??????)
is it intended that each data structure created contains the index of the current element(row) and the total count of rows created? Do I need to keep track of these values within the main program? is there some other mechanism this code is interacting with of which I am unaware?
Statistics: Posted by ras_oscar — Mon Apr 21, 2025 10:33 pm