调用io.open（），而不是os.open（）

Question

I have read Why is Python giving me "an integer is required" when it shouldn't be? . It is nearly a complete solution for my issue, but not quite.

Here is my code:

#! usr/local/bin/python3.6
# coding: utf-8

from os import getcwd, listdir
import psycopg2
from io import open

conn = psycopg2.connect("dbname=ktab user=malikarumi")
cur = conn.cursor()
path = getcwd()
filenames = listdir(path)

for filename in filenames:
with open(filename, 'r', 'utf-16') as f:
    f1 = f.read()

    cur.execute("INSERT INTO testable (title, content, chron_date, clock)\
    VALUES (%s, %s, %s, %s)"),
    (filename, f1, '2017-12-30', '23:59:00'),

conn.commit()
cur.close()
conn.close()

After reading the older SO post, I modified my code as above, so as to specify which io module I wanted and restrict the os modules to the two I was using. Sublime Text 3 has a tooltip which indicates I am calling io.open() , but when I run the code, it is plainly os.open() (I know because of the error):

(lifeandtimes) malikarumi@Tetuoan2:~/Projects/Progress_Logs/2017$
python ktab_odt4.py
Traceback (most recent call last):
File "ktab_odt4.py", line 17, in <module>
with open(filename, 'r', 'utf-16') as f:
TypeError: an integer is required (got type str)

Note: I already tried with io.open() and import io . In both cases pylint squawked and the interpreter gave me name errors. Using 'rb' got past pylint but the interpreter still gives me the TypeError . What is the workaround for this situation?

Answer 1

The third positional parameter to io.open() is buffering , which requires an integer. You are passing the string 'utf-16' as the third parameter, thus the error you're getting. You need to use encoding='utf-16' to pass that value as a keyword parameter.