Signature example

Hi,

I found the following non-deterministic ed25519 signature code in a deprecated library.

import ed25519

privKey, pubKey = ed25519.create_keypair()
print("Private key (32 bytes):", privKey.to_ascii(encoding='hex'))
print("Public key (32 bytes): ", pubKey.to_ascii(encoding='hex'))

msg = b'Message for Ed25519 signing'
signature = privKey.sign(msg, encoding='hex')
print("Signature (64 bytes):", signature)

try:
    pubKey.verify(signature, msg, encoding='hex')
    print("The signature is valid.")
except:
    print("Invalid signature!")

I then pip installed PyNaCl successfully.
I then followed your documentation, from where I got

from PyNaCl.signing import SigningKey
# Generate a new random signing key
signing_key = SigningKey.generate()
# Sign a message with the signing key
signed = signing_key.sign(b"Attack at Dawn")
# Obtain the verify key for a given signing key
verify_key = signing_key.verify_key
# Serialize the verify key to send it to a third party
verify_key_bytes = verify_key.encode()

with either PyNaCl or nacl or NaCl (I tried them all). The result is:

> python .\example_signature_edwards.py
Traceback (most recent call last):
  File "C:\Users\UserName\Desktop\NewPyEnv\example_signature_edwards.py", line 1, in <module>
    from PyNaCl.signing import SigningKey
ModuleNotFoundError: No module named 'PyNaCl'

Can you provide a minimum working example?
I apologize in advance for my apparent inability to get smart of these documentations that I find all around.
Some are uselessly elaborate without giving an actual working example and others are too short, still without giving an actual working example; and again others give working examples that are impossible to understand for someone with a novice math crypto background. Who is the audience?

Start with the PyNaCl signing documentation and the from PyNaCl.signing import SigningKey entry point shown in the issue. Verify the documented installation and import steps, then provide a minimum working signature example with enough explanation for a novice; done means the example runs and resolves the reported ModuleNotFoundError confusion.