I tried every possible thing to add a new line at the end of the existing line, but i am not getting what i exactly need.
Coding:
def retrieve_input(self):
input1 = self.txt1.get("0.0",'end-1c')
with open('text.txt','r+') as f:
f.write(input1+" -d")#<-gettting wrong input
My file:
Hello ,how are you.
After adding a new line to input 1: "are you fine?"
Then it has to add as:
Hello ,how are you.
are you fine?
Please ,help me to fix it!
Try:
with open('text.txt','a+') as f:
f.write(input1+" -d")#<-gettting wrong
An example is enigmatic, I can only guess what it is.
My test file:
first line
second line
third line
My code:
with open('text.txt') as f:
for line in f:
print line+'\n'
Output:
first line
second line
third line
If you are using Windows change \n to \r\n
Related
Whats the way to extract only lines with specific word only from requests (online text file) and write to a new text file? I am stuck here...
This is my code:
r = requests.get('http://website.com/file.txt'.format(x))
with open('data.txt', 'a') as f:
if 'word' in line:
f.write('\n')
f.writelines(str(r.text))
f.write('\n')
If I remove: if 'word' in line:, it works, but for all lines. So it's only copying all lines from one file to another.
Any idea how to give the correct command to extract (filter) only lines with specific word?
Update: This is working but If that word exist in the requests file, it start copying ALL lines, i need to copy only the line with 'SOME WORD'.
I have added this code:
for line in r.text.split('\n'):
if 'SOME WORD' in line:
*Thank you guys for all the answers and sorry If i didn't made myself clear.
Perhaps this will help.
Whenever you invoke POST/GET or whatever, always check the HTTP response code.
Now let's assume that the lines within the response text are delimited with newline ('\n') and that you want to write a new file (change the mode to 'a' if you want to append). Then:
import requests
(r := requests.get('SOME URL')).raise_for_status()
with open('SOME FILENAME', 'w') as outfile:
for line in r.text.split('\n'):
if 'SOME WORD' in line:
print(line, file=outfile)
break
Note:
You will need Python 3.8+ in order to take advantage of the walrus operator in this code
I would suggest you these steps for properly handling the file:
Step1:Streamline the download file to a temporary file
Step2:Read lines from the temporary file
Step3:Generate main file based on your filter
Step4:Delete the temporary file
Below is the code that does the following steps:
import requests
import os
def read_lines(file_name):
with open(file_name,'r') as fp:
for line in fp:
yield line
if __name__=="__main__":
word='ipsum'
temp_file='temp_file.txt'
main_file='main_file.txt'
url = 'https://filesamples.com/samples/document/txt/sample3.txt'
with open (temp_file,'wb') as out_file:
content = requests.get(url, stream=True).content
out_file.write(content)
with open(main_file,'w') as mf:
out=filter(lambda x: word in x,read_lines(temp_file))
for i in out:
mf.write(i)
os.remove(temp_file)
Well , there is missing line you have to put in order to check with if statement.
import requests
r = requests.get('http://website.com/file.txt').text
with open('data.txt', 'a') as f:
for line in r.splitlines(): #this is your loop where you get a hold of line.
if 'word' in line: #so that you can check your 'word'
f.write(line) # write your line contains your word
I have a file that I open and i want to search through till I find a specific text phrase at the beginning of a line. I then want to overwrite that line with 'sentence'
sentence = "new text" "
with open(main_path,'rw') as file: # Use file to refer to the file object
for line in file.readlines():
if line.startswith('text to replace'):
file.write(sentence)
I'm getting:
Traceback (most recent call last):
File "setup_main.py", line 37, in <module>
with open(main_path,'rw') as file: # Use file to refer to the file object
ValueError: must have exactly one of create/read/write/append mode
How can I get this working?
You can open a file for simultaneous reading and writing but it won't work the way you expect:
with open('file.txt', 'w') as f:
f.write('abcd')
with open('file.txt', 'r+') as f: # The mode is r+ instead of r
print(f.read()) # prints "abcd"
f.seek(0) # Go back to the beginning of the file
f.write('xyz')
f.seek(0)
print(f.read()) # prints "xyzd", not "xyzabcd"!
You can overwrite bytes or extend a file but you cannot insert or delete bytes without rewriting everything past your current position.
Since lines aren't all the same length, it's easiest to do it in two seperate steps:
lines = []
# Parse the file into lines
with open('file.txt', 'r') as f:
for line in f:
if line.startswith('text to replace'):
line = 'new text\n'
lines.append(line)
# Write them back to the file
with open('file.txt', 'w') as f:
f.writelines(lines)
# Or: f.write(''.join(lines))
You can't read and write to the same file. You'd have to read from main_path, and write to another one, e.g.
sentence = "new text"
with open(main_path,'rt') as file: # Use file to refer to the file object
with open('out.txt','wt') as outfile:
for line in file.readlines():
if line.startswith('text to replace'):
outfile.write(sentence)
else:
outfile.write(line)
Not the problem with the example code, but wanted to share as this is where I wound up when searching for the error.
I was getting this error due to the chosen file name (con.txt for example) when appending to a file on Windows. Changing the extension to other possibilities resulted in the same error, but changing the file name solved the problem. Turns out the file name choice caused a redirect to the console, which resulted in the error (must have exactly one of read or write mode): Why does naming a file 'con.txt' in windows make Python write to console, not file?
I want to edit a a big file in specific lines.
So it isnt a good Idea to read the whole file before editing, thats why I dont
want to use:
myfile.readlines()
I have to read each line check if there a special content in it and then i have to edit this line.
So far Im reading every line:
file = open("file.txt","r+")
i = 0
for line in file:
if line ......:
//edit this line
//this is where i need help
file.close()
So the Question is:
How can I edit the current line in the If Statement for example:
if the current line is "test" I want to replace it with "test2" and then write "test2" back into the file into the line where "test" was before
This will help
import fileinput
with fileinput.FileInput(filename, inplace=True, backup='.bak') as file:
for line in file:
print(line.replace(text_to_search, replacement_text), end='')
ok so as #EzzatA mentioned in the comments below the question it seems to be the best way to read the original file and create a new one with the edited data.
So something like this:
original_file = open("example.txt","r")
new_file = open("example_converted.xml","w")
string_tobe_replace = "test"
replacement_string = "test2"
for line in original_file:
if string_tobe_replace in line:
new_line = line.replace(string_tobe_replace,replacement_string)
new_file.write(new_line)
else:
new_file.write(line)
original_file.close()
new_file.close()
The context is the following one, I have two text file that I need to edit.
I open the first text file read it line by line and edit it but sometimes when I encounter a specific line in the first text file I need to overwritte content of the the second file.
However, each time I re-open the second text file instead of overwritting its content the below code appends it to the file...
Thanks in advance.
def edit_custom_class(custom_class_path, my_message):
with open(custom_class_path, "r+") as file:
file.seek(0)
for line in file:
if(some_condition):
file.write(mu_message)
def process_file(file_path):
with open(file_path, "r+") as file:
for line in file:
if(some_condition):
edit_custom_class(custom_class_path, my_message)
In my opinion, simultaneously reading and modifying a file is a bad thing to do. Consider using something like this. First read the file, make modifications, and then overwrite the file completely.
def modify(path):
out = []
f = open(path)
for line in f:
if some_condition:
out.append(edited_line) #make sure it has a \n at the end
else:
out.append(original_line)
f.close()
with open(path,'w') as f:
for line in out:
f.write(line)
I'm trying to open .txt file and am getting confused with which part goes where. I also want that when I open the text file in python, the spaces removed.And when answering could you make the file name 'clues'.
My first try is:
def clues():
file = open("clues.txt", "r+")
for line in file:
string = ("clues.txt")
print (string)
my second try is:
def clues():
f = open('clues.txt')
lines = [line.strip('\n') for line in open ('clues.txt')]
The thrid try is:
def clues():
f = open("clues.txt", "r")
print f.read()
f.close()
Building upon #JonKiparsky It would be safer for you to use the python with statement:
with open("clues.txt") as f:
f.read().replace(" ", "")
If you want to read the whole file with the spaces removed, f.read() is on the right track—unlike your other attempts, that gives you the whole file as a single string, not one line at a time. But you still need to replace the spaces. Which you need to do explicitly. For example:
f.read().replace(' ', '')
Or, if you want to replace all whitespace, not just spaces:
''.join(f.read().split())
This line:
f = open("clues.txt")
will open the file - that is, it returns a filehandle that you can read from
This line:
open("clues.txt").read().replace(" ", "")
will open the file and return its contents, with all spaces removed.