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[Solved] Type: sequence item 0: expected str instance, bytes found

Hello Guys, How are you all? Hope You all Are Fine. Today I get the following error Type: sequence item 0: expected str instance, bytes found in python. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How Type: sequence item 0: expected str instance, bytes found Error Occurs?

Today I get the following error Type: sequence item 0: expected str instance, bytes found in python.

How To Solve Type: sequence item 0: expected str instance, bytes found Error ?

  1. How To Solve Type: sequence item 0: expected str instance, bytes found Error ?

    To Solve Type: sequence item 0: expected str instance, bytes found Error Also, if your file is contain strings you can simply open your file in a str mode ('r')instead of byte ('rb').

  2. Type: sequence item 0: expected str instance, bytes found

    To Solve Type: sequence item 0: expected str instance, bytes found Error Also, if your file is contain strings you can simply open your file in a str mode ('r')instead of byte ('rb').

Solution 1


' '
 is a string which you’re calling its join method with a byte sequence. As the documentation’s stated, in python-3.x:

str.joinReturn a string which is the concatenation of the strings in the iterable iterable. A TypeError will be raised if there are any non-string values in iterable, including bytes objects. The separator between elements is the string providing this method.

But in this case since you are dealing with byte objects you cannot use str related methods. The byte object itself comes with a join() method that can be used in the same manner as str.join. You can also use io.BytesIO, or you can do in-place concatenation with a bytearray object. As the documentation’s mentioned bytearray objects are mutable and have an efficient overallocation mechanism.

So you can simply add a b prefix to the empty string to make it a byte object:

line = b" ".join(line.split())

Also, if your file is contain strings you can simply open your file in a str mode ('r')instead of byte ('rb').

with open("input.txt", "r") as f:
    # Do something with f

Note that despite the separation between str and byte objects in python-3.x, in python-2.x you only have str. You can see this by checking the type of a string with b prefix:

In [2]: type(b'')
Out[2]: str

And that’s what that makes the following snippet work:

"".join([b'www', b'www'])

Solution 2

You could use str() function:

lines=str(lines)

before running the command to avoid errors.

This way you convert the lines variable to string.

Summery

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you? Thank You.

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