Pandas DataFrame输出为ASCII ^ A或Unicode SOH分隔文件

Question

Finished my processing of a DataFrame and now I want to export it. Normally I export it as a plain CSV and there isn't a problem. Today I am asked to export the file with a ASCII ^A or the equivalent Unicode SOH delimiter. I will be frank this is the first time I have ever had to deal with ASCII/Unicode delimiters. Can you guys offer me some guidance/help as to how to go about this in pandas/python? I would really appreciate it. Thanks in advance for your help.

Answer 1

In Python you can convert any number to a character using chr() . For your example I think you want chr(1) which is ASCII SOH. You can then pass this as the separator:

df.to_csv('foo.txt', sep=chr(1))

Once you see what chr(1) produces ( \\x01 ), you may realize you can also write it this way:

df.to_csv('foo.txt', sep='\1')

The ASCII table, of course, is here: http://www.asciitable.com/

^A is ASCII SOH according to this: http://academic.evergreen.edu/projects/biophysics/technotes/program/ascii_ctrl.htm - there is no Python escape code for it though. curses.ascii.SOH is close, but it's actually just the constant 1 so pretty useless - you'd be better off just writing SOH = '\\1' in your program.