PYTHON: How to increase the content of a file

Problem scenario:

During the test, hundreds of accounts need to be created. I wrote a script to automatically generate accounts, but I want to write the generated accounts into a file.

The following write() method is used at the beginning. The content of the original file will be cleared first and then new things will be written. Each time the file contains the latest generated account

mobile = Method.createPhone() file = r'D:\test.txt'with open(file, 'w+') as f: f.write(mobile)

Analysis:

After checking the information, about the mode parameter of open():

'r': read

'w': write

'a': append

'r ' == r w (readable and writable, if the file does not exist, an error (IOError) will be reported)

'w ' == w r (readable and writable, the file will be created if it does not exist)

'a ' ==a r (can be appended and writable, the file will be created if it does not exist)

Correspondingly, if it is a binary file, just add a b:

'rb'　'wb'　'ab'　'rb '　'wb '　'ab '

Solution:

It is found that the method is used incorrectly. If new accounts are continuously generated and written, append 'a' should be used

After changing to the following, the solution is:

mobile = Method.createPhone()
file = r'D:\test.txt'with open(file, 'a ') as f:
f.write(mobile '\n') #Add\nNewline display

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