print key into txt file

Question

So I am working on a script to generate serialnumbers for a product. I want to make a txt file where I the script prints the generated key. somehow it cant print in there but I don't know what I need to changes about it.

key = Key('aaaa-bbbb-cccc-dddd-1111')

fh = open('key.txt')

fh.write(Key)

Answer 1

Try:

key = "Key('aaaa-bbbb-cccc-dddd-1111')"
fh = open('key.txt', "w")
fh.write(key)

To generate a text file that doesn't already exist you need to use "w" .

Answer 2

Try doing:

key = Key('aaaa-bbbb-cccc-dddd-1111')
    
with open('key.txt', 'w') as fh: 
    fh.write(key)

Hope that Helps: Note: it must be in the with... so it writes, if its not there the file is considered as closed.

Answer 3

Ok, based on your response, I've mocked up the Key class as follows. Without more information, it's not possible to give you a definitive answer, but hopefully this helps!

class Key:
    def __init__(self, serial):
        self.serial = serial

    def process_serial(self):
        # Your processing here
        ...
        return processed_serial  # This should be a string

Then to write to file, you can do:

key = Key('aaaa-bbbb-cccc-dddd-1111')

with open('key.txt', 'w') as f:
    f.write(key.process_serial())

Alternatively, you can add a __str__ method to your class, which will specify what happens when you call the Python builtin str on your object.

class Key:
    def __init__(self, serial):
        self.serial = serial

    def __str__(self):
        out = ...  # construct what you want to write to file
        return out

Giving:

key = Key('aaaa-bbbb-cccc-dddd-1111')

with open('key.txt', 'w') as f:
    f.write(str(key))

You might also consider adding this as a method to your Key class

class Key:
    __init__(self, serial):
        self.serial = serial

    def process_serial(self):
        # Your processing here
        ...
        return processed_serial  # This should be a string

    def write(self, file_name):
        with open(file_name, 'w') as f:
            f.write(self.process_serial)