Home/ Questions/How to fix typeerror: a bytes-like object is required, not 'str' in Python?
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Nora Evans
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Asked: 2022-05-20T08:08:50+00:00 In:

How to fix typeerror: a bytes-like object is required, not ‘str’ in Python?

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Hey, geys! I am confused with the typeerror: a bytes-like object is required, not ‘str’ in Python. I am having the this file, I save it with the file_sample.txt name:

product;stock;price
bike;10;50
laptop;3;1000
microphone;5;40
book;3;9

Then I write the following program:

with open('file_sample.txt', 'rb') as f:
lines = [x.strip() for x in f.readlines()]

bike_available = False
for line in lines:
tmp = line.strip().lower()
split_line = tmp.split(';')
if split_line[0]=='bike' and int(split_line[1])>0:
bike_available = True

print("Bikes Available? "+ str(bike_available))

Here is the output:

Traceback (most recent call last):
Error line 7, in <module>
splitted_line = tmp.split(';')
TypeError: a bytes-like object is required, not 'str'

I have read a lot of documents, but I don’t know how to fix it. Does someone guide me to solve this error? Thanks!

a bytes-like object is required
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2 Answers

  1. Best Answer
    Expert

    The cause:

    You used with open('file_sample.txt', 'rb') to open the file. rb indicates that the file need to be opened in reading binary mode. Binary mode is reading the data in the form of bytes objects. If you examine line 7, you will notice that you are attempting to split a byte object with a string. Therefore, the operation returns a TypeError.

    Solution:

    To solve this error, the types which the split() operation uses need to match together. The best way is changing the delimiter to a byte object. I have successed by adding the string with b prefix as following:

    with open('file_sample.txt', 'rb') as f:
lines = [x.strip() for x in f.readlines()]

bike_available = False
for line in lines:
tmp = line.strip().lower()
split_line = tmp.split(b';') # Prefixed the b 
if split_line[0]==b'bike' and int(split_line[1])>0:
bike_available = True

print("Bikes Available? "+ str(bike_available))

    This is the output:

    Bikes Available? True

    I also prefixed the b  or added bytes conversion to the if split_line[0]==b'bike' condition, so the types also match, and the comparison is accurate.

    • 15

  2. I removed the b from the open() action and the error disappeared.

    with open('file_sample.txt', 'r') as f:
lines = [x.strip() for x in f.readlines()]

bike_available = False
for line in lines:
tmp = line.strip().lower()
split_line = tmp.split(';')
if split_line[0]=='bike' and int(split_line[1])>0:
bike_available = True

print("Bikes Available? "+ str(bike_available))

    Output is:

    Bikes Available? True
    • 16

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