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Python readlines() function ignores line written by program

I want to read lines and check whether an specific number is in it, but when reading and printing the list with the lines I can't get the 1st line where my testing string was written by the same program:
Code I use to write stuff on the file:
with open('db.txt', 'a') as f:
f.write(f'Request's channel id from guild {guild.id}:{request_channel_id} \n')
and the code I'm using to read the files and check the lines is:
with open('db.txt', 'r') as f:
index = 0
for line in f:
index += 1
if str(message.guild.id) in line or str(message.channel.id) in line:
break
content = f.readlines()
print(content)
content = content[index]
content.strip(":")
The second block of code is returning: [] and empty list even though I opened it and the line is there. But, when I write directly at the file with my keyboard the code "sees" the random stuff I wrote.
.txt file content:
Id do canal de request servidor 833434062248869899: 888273958263222332
a.a
all
a
a
a
a
Error:
['a.a\n', '\n', 'all\n', 'a\n', 'a\n', 'a\n', 'a']
Ignoring exception in on_message
Traceback (most recent call last):
File "C:\Users\CARVALHO\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\client.py", line 343, in _run_event
await coro(*args, **kwargs)
File "C:\Users\CARVALHO\desktop\gabriel\codando\music_bot\main.py", line 48, in on_message
request_channel_id = int(content[1])
IndexError: string index out of range

Replace Carriage Return (CR) and Carriage Return and Line Feed (CRLF) python

I import a .csv file that looks like:
by using the following code:
filetoread = 'G:/input.csv'
filetowrite = 'G:/output.csv'
# https://stackoverflow.com/questions/17658055/how-can-i-remove-carriage-return-from-a-text-file-with-python/42442131
with open(filetoread, "rb") as inf:
with open(filetowrite, "wb") as fixed:
for line in inf:
# line = line.replace('\r\r\n', 'r\n')
fixed.write(line)
print(line)
Which give the output:
b'\xef\xbb\xbfHeader1;Header2;Header3;Header4;Header5;Header6;Header7;Header8;Header9;Header10;Header11;Header12\r\n'
b';;;1999-01-01;;;01;;;;;;\r\n'
b';;;2000-01-01;;;12;;"NY123456789\r\r\n'
b'";chapter;2020-01-01 00:00:00;PE\r\n'
b';;;2020-01-01;;;45;;"NY123456789\r\r\n'
b'";chapter;1900-01-01 00:00:00;PE\r\n'
b';;;1999-01-01;;;98;;;;;;\r\n'
I have issues to replace \r\r\n to \r\n which I guess I need to do to get my desired output.
The error I get when I try to replace the \r\r\n is:
Traceback (most recent call last):
File "g:/till_format_2.py", line 10, in <module>
line = line.replace('\r\r\n', 'r\n')
TypeError: a bytes-like object is required, not 'str'
My desired output:
What do I need to add or change to the code to achieve my desired output?

As the error message says, supply a bytes object.
line = line.replace(b'\r\r\n', b'\r\n')
To get the desired output
line = line.replace(b'\r\r\n', b'')

Trying to read a data from another file in python

I am trying to make my code read the data from a different file. The data in the file emaillist.txt is written in the following format:
a
b
b
c
s
f
s
Now I am tryin to pick a random email from this file and I am getting an error.
Here is the code {Note: this is a piece of code, I have imported the correct libraries}:
with open('emaillist.txt') as emails:
read_emails = csv.reader(emails, delimiter = '\n')
for every_email in read_emails:
return random.choice(every_email)
and this is the error:
Traceback (most recent call last):
File "codeOffshoreupdated.py", line 56, in <module>
'email': email_random(),
File "codeOffshoreupdated.py", line 12, in email_random
for every_email in read_emails:
ValueError: I/O operation on closed file.
Can you please help me fix it? It will be very helpful. Thanks in advance

This code will return you a random email from the emilas that in the file because in your code is returning the first email from the file since it is the first iteration of for every_email in read_emails:
with open('emaillist.txt') as emails:
read_emails = csv.reader(emails, delimiter = '\n')
return random.choice(list(read_emails))[0]

Indent your for loop, like this:
with open('emaillist.txt') as emails:
read_emails = csv.reader(emails, delimiter = '\n')
for every_email in read_emails:
return random.choice(every_email)

Can't convert tuple to string what can I do?

I am trying to turn to out_chars from tuple to string. However, it seems quite troublesome since there is while loop and the state defined its to be tuple. What should I do
I try def convertString but not succesful
out_chars = []
string = ()
for i, char_token in enumerate(computer_response_generator):
out_chars.append(chars[char_token])
print(possibly_escaped_char(out_chars), end='', flush=True)
states = forward_text(net, sess, states, relevance, vocab, chars[char_token])
if i >= max_length:
break
states = forward_text(net, sess, states, relevance, vocab, sanitize_text(vocab, "\n> "))
states = convertTuple(states)
string = convertTuple(out_chars)
print(Text_to_sp(string, states))
Traceback (most recent call last):
File "/Users/quanducduy/anaconda3/chatbot-rnn-master/chatbot.py", line 358, in <module>
main()
File "/Users/quanducduy/anaconda3/chatbot-rnn-master/chatbot.py", line 44, in main
sample_main(args)
File "/Users/quanducduy/anaconda3/chatbot-rnn-master/chatbot.py", line 92, in sample_main
args.relevance, args.temperature, args.topn, convertTuple)
File "/Users/quanducduy/anaconda3/chatbot-rnn-master/chatbot.py", line 169, in chatbot
print(Text_to_sp(string, states))
File "/Users/quanducduy/anaconda3/chatbot-rnn-master/Text_to_speech.py", line 28, in Text_to_sp
myobj.save("welcome.mp3")
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gtts/tts.py", line 249, in save
self.write_to_fp(f)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gtts/tts.py", line 182, in write_to_fp
text_parts = self._tokenize(self.text)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gtts/tts.py", line 144, in _tokenize
text = text.strip()
AttributeError: 'tuple' object has no attribute 'strip'
Process finished with exit code 1

what does your tuple contains?? does it contain complex objects or simple strings numbers etc???
your problem is hard to understand from what you have posted above. but if you want o convert tuple to string you can do like this
new_str = ''.join(yourtuple)

I'm not sure that understand your question right, but if you want to make a string from tuple, its really simple.
def convertTuple(tup):
str = ''.join(tup)
return str
tuple = ('g', 'e', 'e', 'k', 's')
str = convertTuple(tuple)
print(str)

If you cannot ensure all the elements of the tuple are strings, you have to cast them.
''.join([str(elem) for elem in myTuple])

reading last line of txt file in python and change it into variable to make calculation

td = 'date of transaction.txt'
tf = 'current balance.txt'
tr = 'transaction record.txt'
for line in open(tf):pass
for line2 in open(td):pass
for line3 in open(tr):pass
print line2,line,line3
"""
so call recall back last record
"""
rd=raw_input('\ndate of transaction: ')
print "Choose a type of transaction to proceed... \n\tA.Withdrawal \n\tB.Deposit \n\tC.Cancel & exit"
slc=raw_input('type of transaction: ')
i=1
while (i>0):
if slc=="A" or slc=="B" or slc=="C":
i=0
else:
i=i+1
slc=raw_input('invalid selection, please choose again...(A/B/C): ')
if slc=="A":
rr=input('\namount of transaction: ')
Line_len = 10 # or however long a line is, since in my example they all looked the same
SEEK_END = 2
file = open(tf, "r")
file.seek(-Line_len, SEEK_END)
a = int(str(file.read(Line_len)).split(" ")[0].strip())
rf=a-rr
f1=open(tf, 'a+')
f1.write('\n'+rf)
f1.close()
d1=open(td, 'a+')
d1.write('\n'+rd)
d1.close
r1=open(tr, 'a+')
r1.write('\n-'+rr)
r1.close
else:
print 'later'
above is my code, the function is to get data(last line) from txt file and read it, get new data and write it to the txt file again by creating new line.
my txt file(current balance.txt) should look like this:
2894.00
2694.00
but when i try to use the last line which is 2694.00 to do calculation(rf=a-rr), it failed returning this error:
Traceback (most recent call last):
File "C:\Python27\acc.py", line 27, in <module>
file.seek(-Line_len, SEEK_END)
IOError: [Errno 22] Invalid argument
else if i use this code:
for line in open(tf):
pass
a = line
rf=a-rr
it return this error:
Traceback (most recent call last):
File "C:\Python27\acc.py", line 27, in <module>
rf=a-rr
TypeError: unsupported operand type(s) for -: 'str' and 'int'
I seriously have no idea why...please help me...

To obtain last line of the file, you can simple do
with open('my_file.txt') as file:
last_line = file.readlines()[-1]
#last_line is a string value pointing to last line, to convert it into float, you can do
number = float(last_line.strip('\n').strip(' '))

The function input is giving you a string. Try doing:
rf=a-float(rr)