How to write in text file by variable using python 2.7

Question

I have stored the string in a variable. And I want to append it to a text file. How can I achieve this?

 def readyaml(abs_read_path,):
        with open(abs_read_path, 'r') as stream, open("instanceinput.txt",'w') as fnew: 
            try:
                content = yaml.load(stream)
                instance = content['instance']
                dump = instance[0]
                print dump
                fnew.write(dump)
            except yaml.YAMLError as exc:
                print(exc)
        stream.close()
        fnew.close()

    readyaml(abs_read_path)

You may want to read the docs on [file operation](https://docs.python.org/2/tutorial/inputoutput.html#reading-and-writing-files), as well as [PEP 434](https://www.python.org/dev/peps/pep-0343/). You will notice that you do not have to `close` a file obeject when using a context manager. The actual error is obviously due to `dump` not beeing a string. Did you check the type of `dump`? — MaxPowers, Jan 22 '18 at 08:02

score 2 · Answer 1 · answered Jan 22 '18 at 07:35

2

use a instead of w :

 with open(abs_read_path, 'r') as stream, open("instanceinput.txt",'a') as fnew:

answered Jan 22 '18 at 07:35

Vikas Periyadath

3,088
1
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I am getting the same error File "C:\Users\*****\Desktop\ParseScript\readingYAML.py", line 31, in readyaml(abs_read_path) File "C:\Users\*****\Desktop\ParseScript\readingYAML.py", line 25, in readyaml fnew.write(dump) TypeError: expected a string or other character buffer object – Jan 22 '18 at 07:37

score 2 · Accepted Answer · answered Jan 22 '18 at 07:58

You need use the append method as Vikas & Mayur has mentioned and also when writing to a file convert it to a sting object:

Example:

def readyaml(abs_read_path,):
        with open(abs_read_path, 'r') as stream, open("instanceinput.txt",'a') as fnew:
            try:
                content = yaml.load(stream)
                instance = content['instance']
                dump = instance[0]
                print dump
                fnew.write(str(dump))  # CONVERT TO STRING OBJECT
            except yaml.YAMLError as exc:
                print(exc)
        stream.close()
        fnew.close()

    readyaml(abs_read_path)

score 1 · Answer 3 · answered Jan 22 '18 at 07:43

You can use 'a' or 'a+' instead of 'w'

'a' The file is created if it does not exist. Open for writing and appends the data.

'a+'The file is created if it does not exist. Open for both reading and writing and appends the data while writing.

How to write in text file by variable using python 2.7

3 Answers3