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python file.write() does not create new line


python file.write() does not create new line

By : SMMJ
Date : November 20 2020, 03:01 PM
around this issue I am new to Python and am following a tutorial on how to write/read text files here. But I ran into an issue where when writing a file, it does not create another line, but just writes directly after the first one. I attached my code below, any help is appreciated greatly! , Try adding \n at the end of the string
code :


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Objective C - Create text file to read and write line by line in Cocoa

Objective C - Create text file to read and write line by line in Cocoa


By : Vijay B
Date : March 29 2020, 07:55 AM
will help you I building a Mac app,I have 2 problem: , Well, to create a file, just use
code :
[[NSFileManager defaultManager] createFileAtPath:@"Your/Path" contents:nil attributes:nil];
NSString *str = //Your text or XML
[str writeToFile:"Your/Path" atomically:YES encoding:NSUTF8StringEncoding error:nil];
NSString *contents = [NSString stringWithContentsOfFile:@"Your/Path"];
NSData *contents = [NSData dataWithContentsOfFile:@"Your/Path"];
Python 3. Need to write to a file, check to see if a line exist, then write to the file again

Python 3. Need to write to a file, check to see if a line exist, then write to the file again


By : Wodsan Kulendeswaran
Date : March 29 2020, 07:55 AM
I wish this helpful for you You have opened your file in writing mode ('w') In your with statement. To open it both writing and reading mode, do:
code :
with open('md5sums.txt', 'w+') as myfile:
Read/Write File : Write to line in certain order - Python

Read/Write File : Write to line in certain order - Python


By : Kumar Vikram
Date : March 29 2020, 07:55 AM
wish helps you So I noticed that if i reverse the file using reversed() it fixes my problem. For some reason python would always read 'link' first regardless on txt file format. After a lil bit of research i found another way of completing the task that uses list of strings and works regardless on txt file format meaning it will work for the instances where link is under the line that contains data or above it.
Here is the code I used to complete the task using reversed():
code :
import os
import glob

for line in reversed(open("test2.txt").readlines()):
    rec = line.strip()
    rec = rec.replace("<", "_")
    rec = rec.replace(">", "_")
    rec = rec.replace("&", "n")
    rec = rec.replace(" ", "_")
    rec = rec.replace("(", "_")
    rec = rec.replace(")", "_") 
    rec = rec.replace('"', "_")
    rec = rec.replace("'", "_")
    level = ('1', '2', '3', '4', '5', '6', '7', '8', '9')
    link = ('h')
    if rec.startswith(link):
    f = open("temp.txt","a")
    f.write(rec + "&u_link=")  
    elif rec.startswith(level) :
    f = open("temp.txt","a") 
    f.write(rec + "\n\n")   
    f.close()
for line in reversed(open("temp.txt").readlines()):
    lines = line.strip()    
    f = open("hitlistlinks.txt","a") 
    f.write(lines + "\n")    

files = glob.glob('temp.txt')
for f in files:
    os.remove(f)
files = glob.glob('temp.txt')
for f in files:
    os.remove(f)
# Open the file
with open("test3.txt", "r") as f:

# Here we're going to clean up the input file to wipe out
# any whitespace at the beginning or end of each line
    cleaned_lines = []
    for line in f:
        cleaned_lines.append(line.strip())

# Now we'll recombine it back into a single string of text 
# with the lines separated by the \n character
    all_text = "\n".join(cleaned_lines)

# Split the text on blank lines.  Groups should now be a list
# of strings, where each group contains two adjacent lines 
# that contain a link and a strip of data
    groups = all_text.split("\n\n")

# Now we'll go through each group and break it apart into the
# two separate lines.  One of them will start with an "http" 
# and that one will be our link.

    for group in groups:

        line1, line2 = [x for x in group.split("\n") if x]
        if line1.startswith("http"):
            link = line1
            rec = line2 
        elif line2.startswith("http"):
            link = line2
            rec = line1
        else:
        # If one of the two lines doesn't start with "http" we 
        # have a group that doesn't have a link.  
        # I'll just throw 
        # an error and bring the program to a halt.
            raise Exception("This group is missing a link! format(group))

        # At this point the link variable contains the link, and 
        # the data variable contains the other line. Now we can process the input file as intended 
        # and it will work on either file.
        rec = rec.replace("<", "_")
        rec = rec.replace(">", "_")
        rec = rec.replace("&", "n")
        rec = rec.replace(" ", "_")
        rec = rec.replace("(", "_")
        rec = rec.replace(")", "_") 
        rec = rec.replace('"', "_")
        rec = rec.replace("'", "_")
        f = open("hitlist.txt","a")
        f.write(link + "&u_link=" + rec + "\n\n")
        f.close()   
Python: How can I sort file line by line in lexicographic order and write result to file?

Python: How can I sort file line by line in lexicographic order and write result to file?


By : user5524396
Date : March 29 2020, 07:55 AM
will help you I'm a beginner in Python and having trouble understanding this question. Can someone check to see if my code reflects the instructions / how to fix it? Thank you! , I would use file.write(string) to write to the ouput file:
code :
def sortFile(src, dst):
    x, y = open(src, 'r'), open(dst, 'w')
    b = x.readlines()
    x.close()
    b.sort()
    for i in b:
        y.write(i.strip() + "\n")
    y.close()
Python: How to validate input file line-by-line, fix possible errors, and write cleaned lines to another file?

Python: How to validate input file line-by-line, fix possible errors, and write cleaned lines to another file?


By : Rashmi Joshi
Date : March 29 2020, 07:55 AM
Any of those help My lines in the text file look like this : , example without re:
code :
input_filename = 'full_path_to_my_input_file.txt'
output_filename = 'full_path_to_my_output_file.txt'

with open(output_filename, 'a') as f_out:
    with open(input_filename, 'r') as f_in:
        for line in f_in:
            records = line.strip().split(',')
            if float(records[1]) > float(records[3]):
                records[1], records[3] = records[3], records[1]
            if float(records[2]) > float(records[4]):
                records[2], records[4] = records[4], records[2]
            f_out.write(','.join(records) + '\n')
data/processed/10/blueprint-0.png,1915.0,387.0,1933.0,402.0
data/processed/10/blueprint-0.png,3353.0,389.0,3350.0,388.0
data/processed/10/blueprint-0.png,952.0,724.0,1010.0,734.0
data/processed/10/blueprint-0.png,1915.0,387.0,1933.0,402.0
data/processed/10/blueprint-0.png,3350.0,388.0,3353.0,389.0 ## swapped !!
data/processed/10/blueprint-0.png,952.0,724.0,1010.0,734.0
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