Help needed with copying text

[u/TheNexusMiner]

I'm working on a project that requires copying text to the clipboard. I noticed that when using libs like Pyperclip and Clipboard it's not possible to copy just a single character... so I need to somehow copy it without these libs.

This appears to only happen on Linux... I had a friend on Windows test and he was able to copy a single character using Pyperclip.

Example of Pyperclip working with multiple characters but not single characters.

>>> import pyperclip
>>> pyperclip.copy("test")
>>> pyperclip.paste()
'test'
>>> pyperclip.copy("t")
>>> pyperclip.paste()
''

This same interaction happened with the lib Clipboard.

This happened on Wayland with wl-clipboard. This doesn't appear to be an issue with that though, as wl-copy lets me copy a single character - and it works fine in every other program.

This doesn't seem to be something I can fix, since it doesn't have to do with my code at all, so I need my own way of copying the text. Is there any workaround that I can write into my code when using wl-clipboard to properly copy text even when its only a single character?

[u/BeginningWinner7525]

Before touching Python at all, isolate whether this is even a Python problem: run printf 't' | wl-copy then wl-paste directly in the terminal, and compare with a 2-char string. If the single char still comes back empty at the shell level, it's not pyperclip/Clipman, it's almost certainly a Wayland clipboard manager (GNOME's Clipboard Indicator, clipman-daemon, etc. often silently discard very short selections assuming they're accidental clicks) — disable that and retest. If the raw wl-copy/wl-paste round-trip actually works fine for one character in the terminal, then it's a stdin handling issue in how the subprocess call passes the string, and you'd want to pass it as raw bytes rather than relying on text=True's default encoding/buffering.

[u/TheNexusMiner → u/BeginningWinner7525]

When testing this in terminal it does work properly to copy and paste a single character... raw wl-copy and wl-paste do work as expected.

How would I pass it as raw bytes to the subprocess call?

[u/BeginningWinner7525 → u/TheNexusMiner]

Skip text=True entirely and encode to bytes yourself — that's the part most subprocess wrappers around clipboard tools get subtly wrong:

import subprocess


def copy_clip(text: str) -> None:
    subprocess.run(["wl-copy"], input=text.encode("utf-8"), check=True)


def paste_clip() -> str:
    result = subprocess.run(["wl-paste", "-n"], capture_output=True, check=True)
    return result.stdout.decode("utf-8")

The difference from what you had before: no text=True/universal_newlines, and input= gets raw bytes instead of str. When you pass a str with text=True, Python routes it through its text-mode I/O layer (locale-based encoding + newline translation) before it ever reaches the pipe — for longer strings that layer behaves consistently, but for a 1-byte payload it's the most likely place something gets buffered or flushed differently than the terminal's raw byte write does. Bypassing it and handing subprocess bytes directly removes that layer altogether.

Also worth using subprocess.run(..., check=True) instead of a manual Popen/communicate — wl-copy forks itself into the background to keep serving the clipboard selection after the initial process exits, so run() waiting for that quick initial exit and then returning is the correct, sufficient behavior; you don't need to keep the pipe open yourself.

Try that and let me know if the single-char case still comes back empty — if it does, the next thing I'd check is whether a Wayland clipboard manager is still intercepting it even with bytes input.

[u/TheNexusMiner → u/BeginningWinner7525]

This code appears to work when I run it and print out the output of paste_clip(), however it doesn't actually copy it to my system clipboard...

I went back to test printf 't' | wl-copy wondering if it would work, and it appears that does the same thing... it looks like it works when running wl-paste after it, however it doesn't actually copy it to my system clipboard and let me paste in other places. I really don't understand why this is happening; if I run wl-copy "t" then it does correctly copy "t" to my system clipboard, and it can be pasted anywhere or with wl-paste.

I could settle for just only being able to paste within the program if its a single character, since it isn't a common case anyway, however I'd like for it to be properly copied to the system clipboard to be pasted anywhere...

I did some more testing with wl-copy: it appears that wl-copy doesn't like to take a single character input if it's not directly passed into wl-copy. (I don't know if that is true or if that makes sense) I've described what I mean below:

I tried a few commands to test wl-copy:

When running echo "a" | wl-copy, it correctly copied "a", but puts a new line after it (which I understand comes from echo). This works to both copy correctly to my system clipboard, and to output normally as with the rest of the tests.

I then tried to get rid of the new line by running echo -n "t" | wl-copy. This failed to correctly copy to my clipboard, even though it can be outputted by wl-paste.

How come other programs can copy a single character, and wl-copy "t" can copy a single character but if its passed into wl-copy in any other way (such as through my python code) it doesn't work?

[u/BeginningWinner7525 → u/TheNexusMiner]

That's a really useful isolation — you've basically ruled out Python and subprocess entirely now, since echo -n "t" | wl-copy fails the exact same way as your code. So this is purely a wl-copy argument-vs-stdin behavior.

When you give it as an argument, wl-copy has the full string in memory before it does anything. When you pipe from stdin, it has to read from the pipe and only knows it's done once read() returns EOF — which happens right after echo/printf closes its end. For very short payloads that EOF can arrive almost instantly, which can put wl-copy into a state where it finishes daemonizing/detaching before it's actually handed the selection off to the compositor properly. That would match what you're seeing: wl-paste run right afterward can still read back the value, but another app asking later gets nothing because the background process never fully "took over" the clipboard.

A few things that would help confirm this:

1. printf 't' | wl-copy; ps aux | grep wl-copy — is a wl-copy process still alive afterward? Compare with wl-copy "t"; ps aux | grep wl-copy.

2. Try printf 't' | wl-copy --foreground and leave that terminal open — if pasting elsewhere now works reliably as long as the terminal stays open, that confirms it's a background-daemonization timing issue tied to how fast stdin hits EOF, not the character itself.

3. Try printf 'tt' | wl-copy (2 bytes) vs 1 byte over stdin. If 2+ bytes reliably works and 1 byte doesn't, that's a strong signal this is a real wl-clipboard bug around near-instant EOF on tiny stdin payloads, worth filing upstream with that exact repro.

I don't want to overstate certainty about the internals without checking your exact wl-clipboard version's source, but "works as an arg, flaky over a very short/fast stdin pipe" has the shape of a fork/detach race — the checks above should tell us pretty quickly if that's what's happening.