Python How to Initialize Reader Object in Class Definition

Question

I want to make a singleton class that gathers data from a csv file, and in order to do that, it needs to have a data member of type DictReader; but I am not sure how I would initialize this member in the class definition, as it can only be initialized like so:

with open('sourceFile.csv') as source:
    reader = csv.DictReader(source)

Because Python will not allow you to declare variables without initialization, I need to know how I can initialize the reader object in the class Singleton.

Answer 1

Are you looking for something like:

class MySingleton(object):
    def __init__(self, source):
        self.my_reader = DictReader(source)


if __name__ == '__main__':
    singleton = MySingleton(sourcefile)
    for row in singleton.my_reader:
        # do stuff