6 ms·

I associate this with what we used to call "one-liner programming": I would write a single line of Perl code (in bash, prefixed with `perl -Mwarnings -MDebug -E

by gonzus 3y ago

I associate this with what we used to call "one-liner programming": I would write a single line of Perl code (in bash, prefixed with `perl -Mwarnings -MDebug -E'<code here>'`, convince myself the code did what we needed, and then share it around as a paste in irc / chat / whatever. It was amazing what you could achieve with the right modules, and Perl's flexibility allowed your mind to roam freely. Incidentally, the fact that you cannot write this type of one-liner in any meaningful way with Python is one reason I do dislike that language.

fulafel 3y ago
About Python, are there practical situations outside IRC where you can't include a newline in there? This .. python -c ' import re, sys for line in sys.stdin: print(line.lower().count("foo")) ' works in shell interactively (both bash and zsh support multiline history entries well), or in shell scripts, and also in slack/mattermost/matrix/email.
- teddyh 3y ago
  You can do that as a one-liner (I have kept the unused “re” module import, to keep it as close to your code as possible): python -c 'import re, sys; print("\n".join(str(line.lower().count("foo")) for line in sys.stdin))' or if you want to avoid building one large output string: python -c 'import re, sys; print(*(line.lower().count("foo") for line in sys.stdin), sep="\n")' if memory consumption is still an issue: python -c 'import re, sys; set(print(line.lower().count("foo")) for line in sys.stdin)' (This creates a useless Set object and throws it away as a side effect.)
  - deleted 3y ago
    [deleted]
hnfong 3y ago
It's sad that Perl is dying a slow death. Between Python and Perl, both styles of coding are possible. While Python is my preferred language for most tasks, I still use perl as an ad hoc stream processor with `perl -pe` and nothing really beats it at the task. Anything more than 10 lines and I find python easier to deal with (or at least it's my comfort zone).

by gonzus 3y ago

fulafel 3y ago

About Python, are there practical situations outside IRC where you can't include a newline in there? This .. python -c ' import re, sys for line in sys.stdin: print(line.lower().count("foo")) ' works in shell interactively (both bash and zsh support multiline history entries well), or in shell scripts, and also in slack/mattermost/matrix/email.

teddyh 3y ago
You can do that as a one-liner (I have kept the unused “re” module import, to keep it as close to your code as possible): python -c 'import re, sys; print("\n".join(str(line.lower().count("foo")) for line in sys.stdin))' or if you want to avoid building one large output string: python -c 'import re, sys; print(*(line.lower().count("foo") for line in sys.stdin), sep="\n")' if memory consumption is still an issue: python -c 'import re, sys; set(print(line.lower().count("foo")) for line in sys.stdin)' (This creates a useless Set object and throws it away as a side effect.)
- deleted 3y ago
  [deleted]

hnfong 3y ago

It's sad that Perl is dying a slow death. Between Python and Perl, both styles of coding are possible. While Python is my preferred language for most tasks, I still use perl as an ad hoc stream processor with `perl -pe` and nothing really beats it at the task. Anything more than 10 lines and I find python easier to deal with (or at least it's my comfort zone).