"For Line In..." Results in Unicodedecodeerror: 'Utf-8' Codec Can't Decode Byte

for line in... results in UnicodeDecodeError: 'utf-8' codec can't decode byte

As suggested by Mark Ransom, I found the right encoding for that problem. The encoding was "ISO-8859-1", so replacing open("u.item", encoding="utf-8") with open('u.item', encoding = "ISO-8859-1") will solve the problem.

error UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

Python tries to convert a byte-array (a bytes which it assumes to be a utf-8-encoded string) to a unicode string (str). This process of course is a decoding according to utf-8 rules. When it tries this, it encounters a byte sequence which is not allowed in utf-8-encoded strings (namely this 0xff at position 0).

Since you did not provide any code we could look at, we only could guess on the rest.

From the stack trace we can assume that the triggering action was the reading from a file (contents = open(path).read()). I propose to recode this in a fashion like this:

with open(path, 'rb') as f:
  contents = f.read()

That b in the mode specifier in the open() states that the file shall be treated as binary, so contents will remain a bytes. No decoding attempt will happen this way.

UnicodeDecodeError: 'utf-8' codec can't decode byte 0x97 in position 3118: invalid start byte Simple text file

It seems like the file is not encoded in utf-8. Could you try open the file using io.open with latin-1 encoding instead?

from textblob import TextBlob
import io

# dummy variables initialization
pos_correct = 0
pos_count = 0

with io.open("positive.txt", encoding='latin-1') as f:
    for line in f.read().split('\n'):
        analysis = TextBlob(line)
        if analysis.sentiment.polarity > 0:
            pos_correct += 1
        pos_count +=1

UnicodeDecodeError: 'utf8' codec can't decode byte 0xa5 in position 0: invalid start byte

The error is because there is some non-ascii character in the dictionary and it can't be encoded/decoded. One simple way to avoid this error is to encode such strings with encode() function as follows (if a is the string with non-ascii character):

a.encode('utf-8').strip()

python stdin: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xca in position 0: invalid continuation byte

Yes, I do. Let's look at your command line:

(venv) Test@Test-MacBookPro pythonProject1 % /Users/Test/PycharmProjects/pythonProject1/venv/bin/python /Users/Test/PycharmProjects/pythonProject1/proto_1.py < /Users/Test/PycharmProjects/pythonProject1/venv/bin/python /Users/Test/PycharmProjects/pythonProject1/input.txt    

Removing the paths just to make it more clear:

python proto_1.py < python input.txt

You are passing the Python interpreter executable as your input file. Why did you do that? Just pass the file name:

/Users/Test/PycharmProjects/pythonProject1/venv/bin/python /Users/Test/PycharmProjects/pythonProject1/proto_1.py < /Users/Test/PycharmProjects/pythonProject1/input.txt 

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0 when deploying to Heroku

That entire traceback is inside these parentheses: () is not available for this stack. That is the message shown when you request a Python runtime that isn't available. In this case, it looks like your runtime.txt can't even be read due to an unexpected encoding.

Delete it, then create a new file containing something like

python-3.10.2

only. Make sure it is UTF-8 encoded, commit, and redeploy.

At the moment, these are the currently supported Python versions, but the list changes as new versions are released:

• python-3.10.2
• python-3.9.10
• python-3.8.12
• python-3.7.12

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