Merge pull request #411 from ijl/rm-python2

 Drop support for python2

.travis.yml

@@ -10,28 +10,21 @@ cache:
 
 matrix:
   include:
-    - name: Python 2.7
-      python: "2.7"
-      env: FEATURES=python2
     - name: Python 3.5
       python: "3.5"
-      env: FEATURES="python3 test-doc"
+      env: FEATURES="test-doc"
     - name: Python 3.6
       python: "3.6"
-      env: FEATURES=python3
     - name: Python 3.7
       python: "3.7"
-      env: FEATURES=python3
     - name: Python 3.8-dev
       python: "3.8-dev"
-      env: FEATURES=python3
     - name: Minimum nightly
       python: "3.7"
       # Keep this synced up with build.rs
-      env: FEATURES=python3 TRAVIS_RUST_VERSION=nightly-2019-02-07
+      env: TRAVIS_RUST_VERSION=nightly-2019-02-07
   allow_failures:
     - python: "3.8-dev"
-      env: FEATURES=python3
 
 env:
   global:

Cargo.toml

@@ -39,10 +39,7 @@ version_check = "0.1.5"
 [features]
 default = []
 
-# Use this feature when building python2 binding.
-python2 = []
-
-# Use this feature when building python3 binding.
+# this is no longer needed internally, but setuptools-rust assumes this feature
 python3 = []
 
 # Use this feature when building an extension module.

README.md

@@ -16,7 +16,7 @@ A comparison with rust-cpython can be found [in the guide](https://pyo3.rs/maste
 
 ## Usage
 
-PyO3 supports python 2.7 as well as python 3.5 and up. The minimum required rust version is 1.34.0-nightly 2019-02-06.
+PyO3 supports python 3.5 and up. The minimum required rust version is 1.34.0-nightly 2019-02-06.
 
 You can either write a native python module in rust or use python from a rust binary.
 

appveyor.yml

@@ -2,12 +2,8 @@ version: 0.2.{build}
 environment:
   TARGET: x86_64-pc-windows-msvc
   matrix:
-    - PYTHON: "C:/Python27-x64"
-      FEATURES: python2
     - PYTHON: "C:/Python35-x64"
-      FEATURES: python3
     - PYTHON: "C:/Python36-x64"
-      FEATURES: python3
 
 install:
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
@@ -21,9 +17,9 @@ install:
   - set RUST_BACKTRACE=1
 
 build_script:
-  - cargo build --verbose --features %FEATURES%
+  - cargo build --verbose
 
 test_script:
-  - cargo test --verbose --features %FEATURES%
+  - cargo test --verbose
   - pip install setuptools-rust pytest pytest-benchmark
   - cd examples/word-count && python setup.py install && pytest -v tests

build.rs

@@ -7,6 +7,7 @@ use std::fs::File;
 use std::io;
 use std::io::{BufRead, BufReader};
 use std::path::Path;
+use std::process::exit;
 use std::process::Command;
 use std::process::Stdio;
 use version_check::{is_min_date, is_min_version, supports_features};
@@ -482,11 +483,10 @@ fn configure(interpreter_version: &PythonVersion, lines: Vec<String>) -> Result<
                 println!("cargo:rustc-cfg=Py_3_{}", i);
                 flags += format!("CFG_Py_3_{},", i).as_ref();
             }
-            println!("cargo:rustc-cfg=Py_3");
         }
     } else {
-        println!("cargo:rustc-cfg=Py_2");
-        flags += format!("CFG_Py_2,").as_ref();
+        // fail PYTHON_SYS_EXECUTABLE=python2 cargo ...
+        return Err("Python 2 is not supported".to_string());
     }
     return Ok(flags);
 }
@@ -580,7 +580,14 @@ fn main() -> Result<(), String> {
         find_interpreter_and_get_config()?
     };
 
-    let flags = configure(&interpreter_version, lines)?;
+    let flags;
+    match configure(&interpreter_version, lines) {
+        Ok(val) => flags = val,
+        Err(err) => {
+            eprintln!("{}", err);
+            exit(1);
+        }
+    }
 
     // WITH_THREAD is always on for 3.7
     if interpreter_version.major == 3 && interpreter_version.minor.unwrap_or(0) >= 7 {

examples/rustapi_module/setup.py

@@ -20,10 +20,6 @@ def run(self):
 def get_py_version_cfgs():
     # For now each Cfg Py_3_X flag is interpreted as "at least 3.X"
     version = sys.version_info[0:2]
-
-    if version[0] == 2:
-        return ["--cfg=Py_2"]
-
     py3_min = 5
     out_cfg = []
     for minor in range(py3_min, version[1] + 1):

examples/rustapi_module/tox.ini

@@ -1,6 +1,5 @@
 [tox]
-envlist = py27,
-          py35,
+envlist = py35,
           py36,
           py37,
 minversion = 2.9.0

examples/word-count/README.md

@@ -1,6 +1,6 @@
 # word-count
 
-Demonstrates searching for a file in plain python, with rust singlethreaded and with rust multithreaded. 
+Demonstrates searching for a file in plain python, with rust singlethreaded and with rust multithreaded.
 
 ## Build
 
@@ -35,7 +35,7 @@ pytest -v tests
 
 ## Testing
 
-To test python 2.7, 3.5, 3.6 and 3.7, install tox globally and run 
+To test python 3.5, 3.6 and 3.7, install tox globally and run
 
 ```shell
 tox

examples/word-count/tox.ini

@@ -1,6 +1,5 @@
 [tox]
-envlist = py27,
-          py35,
+envlist = py35,
           py36,
           py37,
 minversion = 3.4.0

guide/src/building-and-distribution.md

@@ -2,7 +2,7 @@
 
 ## Python version
 
-PyO3 uses a build script to determine the python version and set the correct linker arguments. By default it uses the `python3` executable. With the `python2` feature it uses the `python2` executable. You can override the python interpreter by setting `PYTHON_SYS_EXECUTABLE`.
+PyO3 uses a build script to determine the python version and set the correct linker arguments. By default it uses the `python3` executable. You can override the python interpreter by setting `PYTHON_SYS_EXECUTABLE`, e.g., `PYTHON_SYS_EXECUTABLE=python3.6`.
 
 ## Linking
 

guide/src/class.md

@@ -503,18 +503,10 @@ Each methods corresponds to python's `self.attr`, `self.attr = value` and `del s
   * `fn __str__(&self) -> PyResult<impl ToPyObject<ObjectType=PyString>>`
 
     Possible return types for `__str__` and `__repr__` are `PyResult<String>` or `PyResult<PyString>`.
-    In Python 2.7, Unicode strings returned by `__str__` and `__repr__` will be converted to byte strings
-    by the Python runtime, which results in an exception if the string contains non-ASCII characters.
 
   * `fn __bytes__(&self) -> PyResult<PyBytes>`
 
-    On Python 3.x, provides the conversion to `bytes`.
-    On Python 2.7, `__bytes__` is allowed but has no effect.
-
-  * `fn __unicode__(&self) -> PyResult<PyUnicode>`
-
-    On Python 2.7, provides the conversion to `unicode`.
-    On Python 3.x, `__unicode__` is allowed but has no effect.
+    Provides the conversion to `bytes`.
 
   * `fn __format__(&self, format_spec: &str) -> PyResult<impl ToPyObject<ObjectType=PyString>>`
 
@@ -540,9 +532,7 @@ Each methods corresponds to python's `self.attr`, `self.attr = value` and `del s
 
   * `fn __bool__(&self) -> PyResult<bool>`
 
-    Determines the "truthiness" of the object.
-    This method works for both python 3 and python 2,
-    even on Python 2.7 where the Python spelling was `__nonzero__`.
+    Determines the "truthyness" of the object.
 
 ### Garbage Collector Integration
 

guide/src/get_started.md

@@ -10,7 +10,7 @@ A comparison with rust-cpython can be found [in the guide](https://pyo3.rs/maste
 
 ## Usage
 
-PyO3 supports python 2.7 as well as python 3.5 and up. The minimum required rust version is 1.30.0-nightly 2018-08-18.
+PyO3 supports python 3.5 and up. The minimum required rust version is 1.34.0-nightly 2019-02-06.
 
 You can either write a native python module in rust or use python from a rust binary.
 

guide/src/module.md

@@ -56,35 +56,31 @@ In python, modules are first class objects. This means can store them as values
 # extern crate pyo3;
 use pyo3::prelude::*;
 use pyo3::{wrap_pyfunction, wrap_pymodule};
-use pyo3::types::PyDict;
+use pyo3::types::IntoPyDict;
 
 #[pyfunction]
-#[cfg(Py_3)]
 fn subfunction() -> String {
     "Subfunction".to_string()
 }
 
 #[pymodule]
-#[cfg(Py_3)]
 fn submodule(_py: Python, module: &PyModule) -> PyResult<()> {
     module.add_wrapped(wrap_pyfunction!(subfunction))?;
     Ok(())
 }
 
 #[pymodule]
-#[cfg(Py_3)]
 fn supermodule(_py: Python, module: &PyModule) -> PyResult<()> {
     module.add_wrapped(wrap_pymodule!(submodule))?;
     Ok(())
 }
 
-#[cfg(Py_3)]
 fn nested_call() {
     let gil = GILGuard::acquire();
     let py = gil.python();
     let supermodule = wrap_pymodule!(supermodule)(py);
     let ctx = [("supermodule", supermodule)].into_py_dict(py);
 
-    py.run("assert supermodule.submodule.subfuntion() == 'Subfunction'", None, Some(&ctx)).unwrap();
+    py.run("assert supermodule.submodule.subfunction() == 'Subfunction'", None, Some(&ctx)).unwrap();
 }
 ```

pyo3-derive-backend/src/defs.rs

@@ -60,11 +60,6 @@ pub const OBJECT: Proto = Proto {
             pyres: true,
             proto: "pyo3::class::basic::PyObjectBytesProtocol",
         },
-        MethodProto::Unary {
-            name: "__unicode__",
-            pyres: true,
-            proto: "pyo3::class::basic::PyObjectUnicodeProtocol",
-        },
         MethodProto::Unary {
             name: "__bool__",
             pyres: false,

pyo3-derive-backend/src/lib.rs

@@ -14,7 +14,7 @@ mod pymethod;
 mod pyproto;
 mod utils;
 
-pub use module::{add_fn_to_module, process_functions_in_module, py2_init, py3_init};
+pub use module::{add_fn_to_module, process_functions_in_module, py_init};
 pub use pyclass::{build_py_class, PyClassArgs};
 pub use pyfunction::PyFunctionAttr;
 pub use pyimpl::{build_py_methods, impl_methods};

pyo3-derive-backend/src/module.rs

@@ -13,7 +13,7 @@ use syn::Ident;
 
 /// Generates the function that is called by the python interpreter to initialize the native
 /// module
-pub fn py3_init(fnname: &Ident, name: &Ident, doc: syn::Lit) -> TokenStream {
+pub fn py_init(fnname: &Ident, name: &Ident, doc: syn::Lit) -> TokenStream {
     let cb_name = Ident::new(&format!("PyInit_{}", name), Span::call_site());
 
     quote! {
@@ -27,18 +27,6 @@ pub fn py3_init(fnname: &Ident, name: &Ident, doc: syn::Lit) -> TokenStream {
     }
 }
 
-pub fn py2_init(fnname: &Ident, name: &Ident, doc: syn::Lit) -> TokenStream {
-    let cb_name = Ident::new(&format!("init{}", name), Span::call_site());
-
-    quote! {
-        #[no_mangle]
-        #[allow(non_snake_case)]
-        pub unsafe extern "C" fn #cb_name() {
-            pyo3::derive_utils::make_module(concat!(stringify!(#name), "\0"), #doc, #fnname)
-        }
-    }
-}
-
 /// Finds and takes care of the #[pyfn(...)] in `#[pymodule]`
 pub fn process_functions_in_module(func: &mut syn::ItemFn) {
     let mut stmts: Vec<syn::Stmt> = Vec::new();

pyo3cls/src/lib.rs

@@ -7,36 +7,15 @@ use proc_macro::TokenStream;
 use proc_macro2::Span;
 use pyo3_derive_backend::{
     add_fn_to_module, build_py_class, build_py_methods, build_py_proto, get_doc,
-    process_functions_in_module, py2_init, py3_init, PyClassArgs, PyFunctionAttr,
+    process_functions_in_module, py_init, PyClassArgs, PyFunctionAttr,
 };
 use quote::quote;
 use syn::parse_macro_input;
 
-#[proc_macro_attribute]
-pub fn pymodule2(attr: TokenStream, input: TokenStream) -> TokenStream {
-    let mut ast = parse_macro_input!(input as syn::ItemFn);
-
-    let modname = if attr.is_empty() {
-        ast.ident.clone()
-    } else {
-        parse_macro_input!(attr as syn::Ident)
-    };
-
-    process_functions_in_module(&mut ast);
-
-    let expanded = py2_init(&ast.ident, &modname, get_doc(&ast.attrs, false));
-
-    quote!(
-        #ast
-        #expanded
-    )
-    .into()
-}
-
 /// Internally, this proc macro create a new c function called `PyInit_{my_module}`
 /// that then calls the init function you provided
 #[proc_macro_attribute]
-pub fn pymodule3(attr: TokenStream, input: TokenStream) -> TokenStream {
+pub fn pymodule(attr: TokenStream, input: TokenStream) -> TokenStream {
     let mut ast = parse_macro_input!(input as syn::ItemFn);
 
     let modname = if attr.is_empty() {
@@ -47,7 +26,7 @@ pub fn pymodule3(attr: TokenStream, input: TokenStream) -> TokenStream {
 
     process_functions_in_module(&mut ast);
 
-    let expanded = py3_init(&ast.ident, &modname, get_doc(&ast.attrs, false));
+    let expanded = py_init(&ast.ident, &modname, get_doc(&ast.attrs, false));
 
     quote!(
         #ast

src/buffer.rs

@@ -289,23 +289,15 @@ impl PyBuffer {
     #[inline]
     pub fn is_c_contiguous(&self) -> bool {
         unsafe {
-            // Python 2.7 is not const-correct, so we need the cast to *mut
-            ffi::PyBuffer_IsContiguous(
-                &*self.0 as *const ffi::Py_buffer as *mut ffi::Py_buffer,
-                b'C' as libc::c_char,
-            ) != 0
+            ffi::PyBuffer_IsContiguous(&*self.0 as *const ffi::Py_buffer, b'C' as libc::c_char) != 0
         }
     }
 
     /// Gets whether the buffer is contiguous in Fortran-style order (first index varies fastest when visiting items in order of memory address).
     #[inline]
     pub fn is_fortran_contiguous(&self) -> bool {
         unsafe {
-            // Python 2.7 is not const-correct, so we need the cast to *mut
-            ffi::PyBuffer_IsContiguous(
-                &*self.0 as *const ffi::Py_buffer as *mut ffi::Py_buffer,
-                b'F' as libc::c_char,
-            ) != 0
+            ffi::PyBuffer_IsContiguous(&*self.0 as *const ffi::Py_buffer, b'F' as libc::c_char) != 0
         }
     }
 
@@ -713,7 +705,6 @@ mod test {
     }
 
     #[test]
-    #[cfg(Py_3)] // array.array doesn't implement the buffer protocol in python 2.7
     fn test_array_buffer() {
         let gil = Python::acquire_gil();
         let py = gil.python();