csvgrep throws UTF-8 error, but on same data csvcut and csvlook don't

Created by: tlongers

Having a UTF-8 issue with csvgrep that I can't resolve through examining previous issues.

1. The csvkit command causing the issue

csvgrep -c 1 -m "Operación" test.csv

2. The input file

test.txt (.csv renamed .txt for Github)

Running file test.csv gives the following:

test.csv: UTF-8 Unicode text

3. The output text (including the traceback)

Message: Your file is not "utf-8" encoded. Please specify the correct encoding with the -e flag. Use the -v flag to see the complete error.

Traceback:

name
Traceback (most recent call last):
  File "/usr/local/bin/csvgrep", line 11, in <module>
    sys.exit(launch_new_instance())
  File "/usr/local/lib/python2.7/site-packages/csvkit/utilities/csvgrep.py", line 71, in launch_new_instance
    utility.run()
  File "/usr/local/lib/python2.7/site-packages/csvkit/cli.py", line 114, in run
    self.main()
  File "/usr/local/lib/python2.7/site-packages/csvkit/utilities/csvgrep.py", line 65, in main
    for row in filter_reader:
  File "/usr/local/lib/python2.7/site-packages/six.py", line 558, in next
    return type(self).__next__(self)
  File "/usr/local/lib/python2.7/site-packages/csvkit/grep.py", line 60, in __next__
    if self.test_row(row):
  File "/usr/local/lib/python2.7/site-packages/csvkit/grep.py", line 71, in test_row
    result = test(value)
  File "/usr/local/lib/python2.7/site-packages/csvkit/grep.py", line 122, in <lambda>
    return lambda x: obj in x
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 7: ordinal not in range(128)

4. Versions / locale etc

csvgrep -V
csvgrep 1.0.2

Python --version
Python 2.7.13

pip -V
pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)

echo $LANG
en_GB.UTF-8

5. Operating system and version

OSX Sierra 10.12.5 (16F73)

6. Remarks

The same issue does not occur with csvcut or csvlook.

csvcut -c 1 test.csv | csvlook

Produces this output:

| name      |
| --------- |
| Operación |