Drop Python version range enforcement from PythonVersion::from_str

[zanieb]

This caused some problems earlier, as it prevented us from listing Python versions <3.7 which seems weird (see #7131 (comment))

I'm worried that without this the changes to installation key parsing in #7263 would otherwise be too restrictive.

I think if we want to enforce these ranges, we should do so separately from the parse step.

[zanieb]

@konstin looking to add this validation somewhere but not sure where it belongs

It looks like this error variant is never used?

uv/crates/uv-python/src/interpreter.rs

Lines 560 to 561 in 4f23491

	#[error("Python {python_version} is not supported. Please use Python 3.8 or newer.")]
	UnsupportedPythonVersion { python_version: String },

We probably need to check this during version requests too?

For future reference, explicit validation looks like this

diff --git a/crates/uv-python/src/python_version.rs b/crates/uv-python/src/python_version.rs
index 6c4a99487..db83bb4ac 100644
--- a/crates/uv-python/src/python_version.rs
+++ b/crates/uv-python/src/python_version.rs
@@ -165,6 +165,18 @@ impl PythonVersion {
         Self::from_str(format!("{}.{}", self.major(), self.minor()).as_str())
             .expect("dropping a patch should always be valid")
     }
+
+    /// Returns an error if the Python version is not supported.
+    pub fn check_supported(&self) -> Result<(), String> {
+        if version.version < Version::new([3, 7]) {
+            return Err(format!("Python version `{s}` must be >= 3.7"));
+        }
+        if version.version >= Version::new([4, 0]) {
+            return Err(format!("Python version `{s}` must be < 4.0"));
+        }
+
+        Ok(())
+    }
 }
 
 #[cfg(test)]

[konstin]

We should be filtering out too old interpreters at

uv/crates/uv-python/python/get_interpreter_info.py

Line 446 in c9774e9

if sys.version_info < (3, 7):

[zanieb]

Ah okay so it's constructed by the deserializer. Lgtm then.