diff --git a/src/types/mod.rs b/src/types/mod.rs
index effe9b80..96a442ce 100644
--- a/src/types/mod.rs
+++ b/src/types/mod.rs
@@ -174,6 +174,5 @@ mod sequence;
 mod set;
 mod slice;
 mod string;
-mod stringutils;
 mod tuple;
 mod typeobject;
diff --git a/src/types/string.rs b/src/types/string.rs
index 90685abf..3847724c 100644
--- a/src/types/string.rs
+++ b/src/types/string.rs
@@ -1,5 +1,7 @@
 // Copyright (c) 2017-present PyO3 Project and Contributors
 
+use crate::conversion::FromPyObject;
+use crate::conversion::{IntoPyObject, PyTryFrom, ToPyObject};
 use crate::err::{PyErr, PyResult};
 use crate::exceptions;
 use crate::ffi;
@@ -113,6 +115,87 @@ impl PyBytes {
     }
 }
 
+/// Converts Rust `str` to Python object.
+/// See `PyString::new` for details on the conversion.
+impl ToPyObject for str {
+    #[inline]
+    fn to_object(&self, py: Python) -> PyObject {
+        PyString::new(py, self).into()
+    }
+}
+
+impl<'a> IntoPyObject for &'a str {
+    #[inline]
+    fn into_object(self, py: Python) -> PyObject {
+        PyString::new(py, self).into()
+    }
+}
+
+/// Converts Rust `Cow<str>` to Python object.
+/// See `PyString::new` for details on the conversion.
+impl<'a> ToPyObject for Cow<'a, str> {
+    #[inline]
+    fn to_object(&self, py: Python) -> PyObject {
+        PyString::new(py, self).into()
+    }
+}
+
+/// Converts Rust `String` to Python object.
+/// See `PyString::new` for details on the conversion.
+impl ToPyObject for String {
+    #[inline]
+    fn to_object(&self, py: Python) -> PyObject {
+        PyString::new(py, self).into()
+    }
+}
+
+impl IntoPyObject for String {
+    #[inline]
+    fn into_object(self, py: Python) -> PyObject {
+        PyString::new(py, &self).into()
+    }
+}
+
+impl<'a> IntoPyObject for &'a String {
+    #[inline]
+    fn into_object(self, py: Python) -> PyObject {
+        PyString::new(py, self).into()
+    }
+}
+
+/// Allows extracting strings from Python objects.
+/// Accepts Python `str` and `unicode` objects.
+impl<'source> crate::FromPyObject<'source> for Cow<'source, str> {
+    fn extract(ob: &'source PyAny) -> PyResult<Self> {
+        <PyString as PyTryFrom>::try_from(ob)?.to_string()
+    }
+}
+
+/// Allows extracting strings from Python objects.
+/// Accepts Python `str` and `unicode` objects.
+impl<'a> crate::FromPyObject<'a> for &'a str {
+    fn extract(ob: &'a PyAny) -> PyResult<Self> {
+        let s: Cow<'a, str> = crate::FromPyObject::extract(ob)?;
+        match s {
+            Cow::Borrowed(r) => Ok(r),
+            Cow::Owned(r) => {
+                let r = ob.py().register_any(r);
+                Ok(r.as_str())
+            }
+        }
+    }
+}
+
+/// Allows extracting strings from Python objects.
+/// Accepts Python `str` and `unicode` objects.
+impl<'source> FromPyObject<'source> for String {
+    fn extract(obj: &'source PyAny) -> PyResult<Self> {
+        <PyString as PyTryFrom>::try_from(obj)?
+            .to_string()
+            .map(Cow::into_owned)
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::PyString;
diff --git a/src/types/stringutils.rs b/src/types/stringutils.rs
deleted file mode 100644
index 87959ed4..00000000
--- a/src/types/stringutils.rs
+++ /dev/null
@@ -1,89 +0,0 @@
-use crate::err::PyResult;
-use crate::instance::PyNativeType;
-use crate::object::PyObject;
-use crate::types::{PyAny, PyString};
-use crate::FromPyObject;
-use crate::Python;
-use crate::{IntoPyObject, PyTryFrom, ToPyObject};
-use std::borrow::Cow;
-
-/// Converts Rust `str` to Python object.
-/// See `PyString::new` for details on the conversion.
-impl ToPyObject for str {
-    #[inline]
-    fn to_object(&self, py: Python) -> PyObject {
-        PyString::new(py, self).into()
-    }
-}
-
-impl<'a> IntoPyObject for &'a str {
-    #[inline]
-    fn into_object(self, py: Python) -> PyObject {
-        PyString::new(py, self).into()
-    }
-}
-
-/// Converts Rust `Cow<str>` to Python object.
-/// See `PyString::new` for details on the conversion.
-impl<'a> ToPyObject for Cow<'a, str> {
-    #[inline]
-    fn to_object(&self, py: Python) -> PyObject {
-        PyString::new(py, self).into()
-    }
-}
-
-/// Converts Rust `String` to Python object.
-/// See `PyString::new` for details on the conversion.
-impl ToPyObject for String {
-    #[inline]
-    fn to_object(&self, py: Python) -> PyObject {
-        PyString::new(py, self).into()
-    }
-}
-
-impl IntoPyObject for String {
-    #[inline]
-    fn into_object(self, py: Python) -> PyObject {
-        PyString::new(py, &self).into()
-    }
-}
-
-impl<'a> IntoPyObject for &'a String {
-    #[inline]
-    fn into_object(self, py: Python) -> PyObject {
-        PyString::new(py, self).into()
-    }
-}
-
-/// Allows extracting strings from Python objects.
-/// Accepts Python `str` and `unicode` objects.
-impl<'source> crate::FromPyObject<'source> for Cow<'source, str> {
-    fn extract(ob: &'source PyAny) -> PyResult<Self> {
-        <PyString as PyTryFrom>::try_from(ob)?.to_string()
-    }
-}
-
-/// Allows extracting strings from Python objects.
-/// Accepts Python `str` and `unicode` objects.
-impl<'a> crate::FromPyObject<'a> for &'a str {
-    fn extract(ob: &'a PyAny) -> PyResult<Self> {
-        let s: Cow<'a, str> = crate::FromPyObject::extract(ob)?;
-        match s {
-            Cow::Borrowed(r) => Ok(r),
-            Cow::Owned(r) => {
-                let r = ob.py().register_any(r);
-                Ok(r.as_str())
-            }
-        }
-    }
-}
-
-/// Allows extracting strings from Python objects.
-/// Accepts Python `str` and `unicode` objects.
-impl<'source> FromPyObject<'source> for String {
-    fn extract(obj: &'source PyAny) -> PyResult<Self> {
-        <PyString as PyTryFrom>::try_from(obj)?
-            .to_string()
-            .map(Cow::into_owned)
-    }
-}