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I already created a txt file using python with a few lines of text that will be read by a simple program. However, I am having some trouble reopening the file and writing additional lines in the file in a later part of the program. (The lines will be written from user input obtained later on.)
with open('file.txt', 'w') as file: file.write('input') This is assuming that 'file.txt' has been opened before and written in. In opening this a second time however, with the code that I currently have, I have to erase everything that was written before and rewrite the new line. Is there a way to prevent this from happening (and possibly cut down on the excessive code of opening the file again)?
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Python write multiple lines to file. To write multiple lines to a file in Python, use a with open() function and then the writelines() function. The writelines() method writes the items of a list to the file. The texts will be inserted depending on the file mode and stream position.
In brief, any data can be read by Python. You can use the open(filename,mode) function to open a file. There are a set of file opening modes. To write in an existing file you have to open the file in append mode("a") , if the file does not exist, the file will be created.
In order to append a new line to the existing file, open the file in append mode, by using either 'a' or 'a+' as the access mode. The definition of these access modes is as follows: Append Only ('a'): Open the file for writing. The file is created if it does not exist.
If you want to append to the file, open it with 'a'. If you want to seek through the file to find the place where you should insert the line, use 'r+'. (docs)
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Open the file for 'append' rather than 'write'.
with open('file.txt', 'a') as file: file.write('input') If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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