Differences between opening files in binary and text formats

Binary File processing problems

When processing binary files, use the following method:

Binfile = open (filepath, 'rb') read binary files

Binfile = open (filepath, 'wb ') to write binary files

So what is the difference between the result of binfile = open (filepath, 'R?

There are two differences:

First, if you encounter '0x1a 'when using 'R', it is regarded as the end of the file, which is EOF. This problem does not exist when 'rb' is used. That is, if you use binary data to write and then read the data in text, if '0x1a 'exists, only part of the file will be read. When 'rb' is used, it will always read at the end of the file.

Second, for string x = 'abc \ ndef ', we can use Len (X) to get its length of 7. \ n is called a line break, which is actually '0x0a '. When we use 'W' as the text writing method, '0x0a' is automatically changed to two characters '0x0d' and '0x0a' on Windows ', that is, the file length is actually 8 .. When reading in 'R' text, it is automatically converted to the original line break. If it is written in 'wb 'binary format, it will keep one character unchanged and read as is. Therefore, if you write data in text and read data in binary mode, consider the extra byte. '0x0d' is also called a carriage return. Linux does not change. Because Linux only uses '0x0a' to indicate line breaks.