How to build an array of Objects in a loop - arrays

Question

I'm new with Python but i'm a Powershell user so maybe what i'm trying to do is not possible the same way in Python
In Python 3 to learn i'm trying to make a list of the files in a directory and store it into a indexstore variable.
To do that this is what i done :
i created 2 objects Index and Indexstore
class Index(object):
def __init__(self, filepath, size):
self.filepath = filepath
self.size = size
and
class IndexStore(object):
def __init__(self, filepath, size):
self.filepath = filepath
self.size = size
after that i get my filelist from a location on my HDD
listOfFile = os.listdir(SourcePath)
With with list i'm starting a loop where i get the fullpath and the size of the file ( Like ForEach ) in 2 variables fullPath and fileSize
fullPath = os.path.join(SourcePath, entry)
fileSize: int = os.path.getsize(fullPath)
With the values i set the Index Object
setattr(Index, 'filepath', fullPath)
setattr(Index, 'size', fileSize)
And it's working with
pprint(vars(Index))
i have the result
mappingproxy({'dict': <attribute 'dict' of 'Index' objects>,
'doc': None,
'init': <function Index.init at 0x00000271B9C7E940>,
'module': 'main',
'repr': <property object at 0x00000271B9F30590>,
'weakref': <attribute 'weakref' of 'Index' objects>,
'filepath': 'D:\AmigaForever\AmigaOS3.9.ISO',
'size': 28862259})
After that is my problem ! In Powershell if i want to add a object2 to my objectlist1 i just do Objectlist1 += object2 and the work is done but in Python 3.x i tried many things on forums without success best way seems to be :
IndexStore = []
IndexStore.append(Index(fullPath, fileSize))
But the variable Indexstore stay Empty and if i try to print it
print(IndexStore)
pprint(vars(IndexStore))
the run console say :
print(IndexStore)
TypeError: 'tuple' object is not callable
Can you help me please ? Do i'm checking the value of my Indexstore well ?
Or my error is how i'm appending the values ?
I want in a second loop use again the values of the Object array to continue my code.

Answer 1

With the goal of 'Using Python 3 to make a list of the files in a directory and store it into a indexstore variable'.
The first problem I see is that you create a class Indexstore but later completely obviate the class when you assign the variable Indexstore = [].
so given you have a valid list of files from:
listOfFile = os.listdir(SourcePath)
This is an approach that will work:
First build an IndexItem class:
class IndexItem:
def __init__(self, filepath, size):
self.filepath = filepath
self.size = size
def __repr__(self):
# Returns a string representation of the IindexItem
return f"({self.filepath}, {self.size})"
This class has an intialization method which serves to preserve the instantiation values passed during initialization and a repr method which is used to convert the index values into readable text.
Next we create the IndexStore Class as follows:
class IndexStore:
def __init__(self):
self._index = []
def append(self, o: object):
# Append an entry onto the index
self._index.append(o)
def __repr__(self):
# Returns a string representation of self._index
return ', '.join(list(str(x) for x in self._index))
This class includes an instantiation which creates a list to hold the indexItems passed to it, and append method to add IndexItems to the IndexStore and finally a repr to create a readable string of the values.
Finally, we implement the basic functionality required to build the IndexStore as follows:
listOfFile = os.listdir(sourcePath)
index = IndexStore()
for f in listOfFile[:5]:
# For each entry f in listOfFile
fullpath = os.path.join(sourcePath, f)
# add an instantiation of IndexItem to IndexStore
index.append(IndexItem(fullpath, int(os.path.getsize(fullpath))))
print(index)
A simpler and more direct approach to this problem makes use of inherent Python bult-in data structures and capabilities is as follows:
IndexStore = []
listOfFile = os.listdir(sourcePath)
for f in listOfFile[:5]:
# For each entry f in listOfFile
fullpath = os.path.join(sourcePath, f)
# add an instantiation of IndexItem to IndexStore
IndexStore.append((fullpath, int(os.path.getsize(fullpath)))
print(IndexStore)
In this approach, the class definitions are eliminated, and the IndexStore contains a list of tuples with each tuple containing the fullpath to the file and it's size