Python 3 Programming Tutorial - Appending Files

Now we get to appending a file in python. I will just state again that writing will clear the file and write to it just the data you specify in the write operation. Appending will simply take what was already there, and add the new data to it.

That said, when you actually go to add to the file, you will still use ".write." You only specify that you will be appending instead of writing when you open the file and specify your intentions.

Bitcoin donations: 1GV7srgR4NJx4vrk7avCmmVQQrqmv87ty6

[viewerwatcher]

I can't thank you enough, doing python at school and your tutorials are helping me pass! You are a life saver!

[DronePilot]

The best tutor for python .. I must say thanks a lot for your intense initiative

[orebit]

Thank you for helping, I feel like other tutorials will use modules or functions without any explanation of what it does, with your videos I feel like I truly get a sense of the tools I'm using instead of feeling like I understand it but not being completely sure.

[sentdex]

Cian Head Great to hear, happy to help!

[zhidongzhao]

In computer programming, there are many situations where you may need to add new data to an existing file or array. This is where the term AppendMe comes in. Essentially, AppendMe is a command that tells the program to add new data to an existing file or array.

The AppendMe command is often used in situations where you need to keep track of data over time. For example, if you are working on a program that needs to keep track of customer orders, you may use the AppendMe command to add new orders to an existing file or array.

One of the great things about the AppendMe command is that it allows you to add new data to an existing file or array without overwriting any existing data. This means that you can keep all of your data in one place, without having to worry about losing any important information.

Another benefit of using the AppendMe command is that it is a relatively simple and straightforward command to use. In most programming languages, you can simply call the AppendMe command and pass in the data that you want to add to the file or array.

Overall, AppendMe is a term that is commonly used in computer programming, specifically in the context of adding data to an existing file or array. It is a powerful command that allows you to keep track of data over time, without overwriting any existing data. If you are working on a program that requires you to add new data to an existing file or array, the AppendMe command is definitely something that you should be familiar with.

[mackenziesharp]

omg thanks so much i had 'n' as my identifier for my append written down in my lecture notes and my exam is tomorrow!! you're a life saver

[kalkidanberhanu]

Thanks a lot! You explained this so much better than my prof.

[kishanbsh]

Instead of appending \n what i would suggest you do is (This is B-) )

textVal = '''
I
  am
    great
'''

f = open("someFile.txt", "w")
f.write(textVal)
f.close()

This will write as you see it on the screen. Im from a java background and i really
liked this "multi line string" feature of python. Its B-)

[itzdevs_dev]

When doing this can you make it so it writes in a variable used earlier?

[lamanifaudelhani]

Hi Nice Video,
how a append any text in the first line !?

[notarealname]

Thanks for the help (I earased all my data yesterday because I used Write instead of Append)

[MindaugasV]

if you use appendFile.write(appendMe + '\n')
the there is no first empty line and strings add up to new seperate line.

[jakubgajdul]

Try the below:

text = 'sample Text to save\nNew line!'
count = 0

while count < 99:
count +=1
print (count)
save_file = open (str(count)+'example_file.txt', 'w')
save_file.write(text)
save_file.close()

[sbollmeyer]

Any noobs out there, sendtex is it! Great tutorials!

[teststudios]

how can i remove like 1st line from 3 line txt file ?

[lottie.lafunk]

in File handling: what if the user inputs the filename then you create one how will i do it? also in readlines how can i add user input data in every line?
i.e in filename.txt
Name:
Age:
Sex:
then the user will input some data in it...
output should be:
Name: Anna
Age: 3
Sex: Female

[azegaspa]

Hi! How would you append a certain text to ALL the files in a folder instead of to a single file? Thank you!

[TheRIGURAS]

In the event that you overwrite something, how do you undo?

[kiranitaliya]

Is there appendFile and saveFile is variable or something?

[jasoncprince]

Just wanted to share my experience with this tutorial.

@ 1:32 different ways of adding new lines was shown. This gave me an error.

This is my code. Note, my line numbers didn't copy over so I typed them in.


1. appendMe = '\n New bit of information' # Add a new line before appending. State what to add in quotations
2. appendFile = open('exampleFile.txt', 'a') # Open desired file with full path in quotation. "a" for append
3. appendFile = '\n' # Another way to add a new line before appending
4. appendFile.write(appendMe)
5. # "appendFile" Has the set of instructions to open exampleFile.txt and be ready to append it and add a new line.
6. # ".write(appendMe)" Says write the following text in appendMe "\n New bit of information"
7. appendFile.close() # Always close the file


I was getting this error.


File ".../.../tutAppendFile.py", line 4, in <module>
appendFile.write(appendMe)
AttributeError: 'str' object has no attribute 'write'


I thought something was wrong with line 4. Nope, it was line 3. Removed line three (appendFile = '\n' ) and all was right again. Also tried changing line 3 to appendFile.write('\n') and that worked too.