Strange write()/File behaviour

Hi I have a long python application, and within it's workflow I am trying to write snippets of strings to an error log.

I was using:

lines = ['ERROR TITLE: user ' + str(user_id) + ' ' + firstName + ' ' + lastName + ' dataframe is empty for this user']
with open(ERROR_LOG_PATH + ERROR_LOG_NAME, 'a') as file:
    file.write('\n'.join(lines))
    file.write('\n')
    file.close()

This worked and the result was a single line of text in a text document expressing a specific error I wanted to record.

The issue came when I realised I was duplicating the with open call throughout my code. So I attempted to convert the write open call to a custom function like this:

def write_to_log(lines):

    with open(ERROR_LOG_PATH + ERROR_LOG_NAME, 'a') as file:
        file.write('\n'.join(lines))
        file.write('\n')
        file.close()

Then I call the write to log function each time I need to pass it the list to write like this:

write_to_log([ERROR TITLE: user ' + str(user_id) + ' ' + firstName + ' ' + lastName + ' dataframe is empty for this user])

Now however, I get weird output within the text file. instead of readable text I get:

I then commented out the change and reverted back to a write file call per error text call. but I seem to be getting the error no matter what now.

Scope:

I am writing and executing the code via VSCode on a mac. the text file is going to a file location on a network NAS, and I have tried to open the file on various machines and with various text editors (as I thought it may be a NotePad issue on my windows machine), but the bad characters remain.

I am clearly doing something stupid. all assistance greatly appreciated.

Kind regards

Duncan

1. Youre calling file.close() while using context manager, but you dont need to because file will be closed automatically
2. Try to specify the encoding

def write_to_log(lines):
    with open(ERROR_LOG_PATH + ERROR_LOG_NAME, 'a', encoding='utf-8') as file:
        file.write('\n'.join(lines) + '\n')


</details>



# 答案2
**得分**: 0

```python
def write_to_log(lines):

    with open(ERROR_LOG_PATH + ERROR_LOG_NAME, 'a') as file:
        file.write('\n'.join(lines))
        file.write('\n')
        file.close()

user_id = 1
firstName ='hello'
lastName = 'goodbye'

ERROR_LOG_PATH = 'rest'
ERROR_LOG_NAME ='test'
lines = ['ERROR TITLE: user ' + str(user_id) + ' ' + firstName + ' ' + lastName + ' dataframe is empty for this user']

write_to_log(lines) # 在此处传递了行

def write_to_log(lines):

    with open(ERROR_LOG_PATH + ERROR_LOG_NAME, 'a') as file:
        file.write('\n'.join(lines))
        file.write('\n')
        file.close()

user_id = 1
firstName ='hello'
lastName = 'goodbye'

ERROR_LOG_PATH = 'rest'
ERROR_LOG_NAME ='test'
lines = ['ERROR TITLE: user ' + str(user_id) + ' ' + firstName + ' ' + lastName + ' dataframe is empty for this user']

write_to_log(lines) //passed lines here

ERROR TITLE: user 1 hello goodbye dataframe is empty for this user