Weatherby,Gerard 在 2022年12月9日 星期五晚上9:36:18 [UTC+8] 的信中寫道： > That’s actually more of a shell question than a Python question. How you pass > certain control characters is going to depend on the shell, operating system, > and possibly the keyboard you’re using. (e.g. https://www.alt-codes.net). > > Here’s a sample program. The dashes are to help show the boundaries of the > string > > #!/usr/bin/env python3 > import argparse > import logging > > > parser = > argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter) > > parser.add_argument('data') > args = parser.parse_args() > print(f'Input\n: -{args.data}- length {len(args.data)}') > for c in args.data: > print(f'{ord(c)} ',end='') > print() > > > Using bash on Linux: > > ./cl.py '^M > ' > Input > - > - length 3 > 13 32 10 > From: Python-list <python-list-bounces+gweatherby=uchc...@python.org> on > behalf of Jach Feng <jf...@ms4.hinet.net> > Date: Thursday, December 8, 2022 at 9:31 PM > To: pytho...@python.org <pytho...@python.org> > Subject: Re: How to convert a raw string r'xdd' to 'xdd' more gracefully? > *** Attention: This is an external email. Use caution responding, opening > attachments or clicking on links. *** > Jach Feng 在 2022年12月7日 星期三上午10:23:20 [UTC+8] 的信中寫道： > > s0 = r'\x0a' > > At this moment it was done by > > > > def to1byte(matchobj): > > ....return chr(int('0x' + matchobj.group(1), 16)) > > s1 = re.sub(r'\\x([0-9a-fA-F]{2})', to1byte, s0) > > > > But, is it that difficult on doing this simple thing? > > > > --Jach > The whold story is, > > I had a script which accepts an argparse's positional argument. I like this > argument may have control character embedded in when required. So I make a > post "How to enter escape character in a positional string argument from the > command line? on DEC05. But there is no response. I assume that there is no > way of doing it and I have to convert it later after I get the whole string > from the command line. > > I made this convertion using the chr(int(...)) method but not satisfied with. > That why this post came out. > > At this moment the conversion is done almost the same as Peter's > codecs.decode() method but without the need of importing codecs module:-) > > def to1byte(matchobj): > ....return matchobj.group(0).encode().decode("unicode-escape") > -- > https://urldefense.com/v3/__https://mail.python.org/mailman/listinfo/python-list__;!!Cn_UX_p3!hcg9ULzmtVUzMJ87Emlfsf6PGAfC-MEzUs3QQNVzWwK4aWDEtePG34hRX0ZFVvWcqZXRcM67JkkIg-l-K9vB$<https://urldefense.com/v3/__https:/mail.python.org/mailman/listinfo/python-list__;!!Cn_UX_p3!hcg9ULzmtVUzMJ87Emlfsf6PGAfC-MEzUs3QQNVzWwK4aWDEtePG34hRX0ZFVvWcqZXRcM67JkkIg-l-K9vB$>
> That’s actually more of a shell question than a Python question. How you pass > certain control characters is going to depend on the shell, operating system, > and possibly the keyboard you’re using. (e.g. https://www.alt-codes.net). You are right, that's why I found later that it's easier to enter it using a preferred pattern. But there is a case, as moi mentioned in his previous post, will cause failure when a Windows path in the form of \xdd just happen in the string:-( -- https://mail.python.org/mailman/listinfo/python-list
