Getting AttributeError while loading and accessing the data using csv.reader()

Question

Below is the code while running the code, getting an AttributeError: 'NoneType' object has no attribute 'format'.

import csv
import numpy
def loadCsv(filename):
    lines = csv.reader(open(filename,"r"))
    dataset = list(lines)
    for i in range(len(dataset)):
        dataset[i] = [float(x) for x in dataset[i]]
    return dataset
filename = 'data1.csv'
dataset = loadCsv(filename)
print('Loaded data file {0} with {1} rows').format(filename, len(dataset))

print('Loaded data file {0} with {1} rows').format(filename, len(dataset)) should be print('Loaded data file {0} with {1} rows'.format(filename, len(dataset))) - format is a string method. — Chillie
– Chillie, Commented Sep 13, 2018 at 11:27
The trace stack should say what object is NoneType, which is something you should have included in your question. — Acccumulation
– Acccumulation, Commented Sep 14, 2018 at 17:11

Cut7er · Accepted Answer · 2018-09-14 17:05:41Z

1

change this

print('Loaded data file {0} with {1} rows').format(filename, len(dataset))

to this

print('Loaded data file {0} with {1} rows'.format(filename, len(dataset)))

you get the error because you try to apply .format to the print-function, whereas it is a method which needs to be applied to a string.

edited Sep 14, 2018 at 17:05

answered Sep 13, 2018 at 11:28

Cut7er

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4 Comments

vamsi shankar Over a year ago

Extra parentheses must be added to the print statement.

Cut7er Over a year ago

this is not true!

vamsi shankar Over a year ago

Check that out once extra parentheses must be added for sure.

Acccumulation Over a year ago

More precisely, print is a function that returns None. If had returned a string, this error wouldn't appear.

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