Strip white spaces from CSV file

Question

I need to stripe the white spaces from a CSV file that I read

import csv

aList=[]
with open(self.filename, \'r\') as f:
    reader = csv.reader(f, delimite         


        

Answer 1

The most memory-efficient method to format the cells after parsing is through generators. Something like:

with open(self.filename, 'r') as f:
    reader = csv.reader(f, delimiter=',', quoting=csv.QUOTE_NONE)
    for row in reader:
        yield (cell.strip() for cell in row)

But it may be worth moving it to a function that you can use to keep munging and to avoid forthcoming iterations. For instance:

nulls = {'NULL', 'null', 'None', ''}

def clean(reader):
    def clean(row):
        for cell in row:
            cell = cell.strip()
            yield None if cell in nulls else cell

    for row in reader:
        yield clean(row)

Or it can be used to factorize a class:

def factory(reader):
    fields = next(reader)

    def clean(row):
        for cell in row:
            cell = cell.strip()
            yield None if cell in nulls else cell

    for row in reader:
        yield dict(zip(fields, clean(row)))