I love BATCH, despite its shocking lack of functional commands, despite even due to its lack of non-integer support. Why? Because this works: SET var=SET %var% i=0 This would evaluate to: SET var=SET SET i=0 Fantastic, isn't it? I've used this technique in a BATCH program before, because it...

I'm from PPCG so I was making an esolang and I decided to write it in Python. Eventually it went from an esolang to an OEIS (Online Encyclopedia of Integer Sequences) lookup tool. I'm very new to Python. Essentially this program takes an OEIS sequence number (e.g. 55 for sequence A000055) and t...

You can't parse [X]HTML with regex. Because HTML can't be parsed by regex. Regex is not a tool that can be used to correctly parse HTML. As I have answered in HTML-and-regex questions here so many times before, the use of regex will not allow you to consume HTML. Regular expressions are a tool th...

𝔼𝕊𝕄𝕚𝕟, 11 chars / 14 bytes ⟮ɕṡ+ᶈ0)ď⧺ḁ; Try it here (Firefox only). I'm not sure if copy blocks ⟮ (which, quite literally, "copy pieces of code") are considered "reading source code," but if invalid, I'll be willing to delete the submission. Explanation Quine framework: ⟮ɕṡ+ᶈ0 ⧺ḁ incre...

import*: Please avoid importing all modules at all costs. Import each module you use separately Regex ಠ_ಠ Regex is evil, the worst. seriously. stop it. right now. kill python.exe right now and change it. You use beautifulsoup, a dom parsing library, literally a few lines later, but you choo...

Redundant code print """This is the OEIS lookup tool You haven't entered the sequence""" % (LANGNAME) This can easily become print "This is the OEIS lookup tool\nYou haven't entered the sequence" You accidentally left some residual code from Putt in there. ♫ Let's all hop on the co...

Jolf, 4 bytes Q«Q« Q double (string) « begin matched string Q« capture that This transpiles to square(`Q«`) (I accidentally did string doubling in the square function), which evaluates to Q«Q«. Note that q is the quining function in Jolf, not Q ;).

I've come across at least three ways to print to stderr: import sys print >> sys.stderr, 'spam' sys.stderr.write('spam\n') from __future__ import print_function print('spam', file=sys.stderr) It seems to contradict zen of Python #13 †, so what's the preferred way to do it? Are there an...

cat, 0 - ∞ characters UNIX cat is a programming language with no syntax. The output of any program in cat language is the source code itself. "you can't just read the source file and print it" I am not doing that! It's the language itself, it's the cat interpreter who does it.

JavaScript, 8 bytes Symbol() Uses Symbol.

Using your language of choice, golf a quine. No cheating -- that means that you can't just read the source file and print it. Also, in many languages, an empty file is also a quine: that isn't considered a legit quine either. Points for: Smallest code (in characters) Most obfuscated/obscure s...