pip install fastapi[all] is failing due to a rust component? - python-3.x

Question

Hi I'm trying to install fastapi, but it seems to be failing when im installing orjson
Here is the full error code:
Building wheel for orjson (PEP 517) ... error
ERROR: Command errored out with exit status 1:
command: 'd:\pythonapps\fastapi_tutorial\env\scripts\python.exe' 'd:\pythonapps\fastapi_tutorial\env\lib\site-packages\pip\_vendor\pep517\_in_process.py' build_wheel 'C:\Users\User\AppData\Local\Temp\tmp4yope0de'
cwd: C:\Users\User\AppData\Local\Temp\pip-install-35a1h4do\orjson
Complete output (50 lines):
Compiling cfg-if v0.1.10
Compiling winapi v0.3.8
Compiling bitflags v1.2.1
Compiling ryu v1.0.5
Compiling scopeguard v1.1.0
Compiling packed_simd v0.3.3
Compiling serde v1.0.111
Compiling lexical-core v0.7.4
Compiling libc v0.2.71
Compiling version_check v0.9.2
Compiling smallvec v1.4.0
Compiling arrayvec v0.5.1
Compiling encoding_rs v0.8.23
Compiling static_assertions v1.1.0
Compiling itoa v0.4.5
Compiling orjson v3.1.0 (C:\Users\User\AppData\Local\Temp\pip-install-35a1h4do\orjson)
Compiling rand_core v0.4.2
Compiling inlinable_string v0.1.11
Compiling associative-cache v1.0.1
Compiling once_cell v1.4.0
Compiling lock_api v0.3.4
Compiling wyhash v0.3.0
Compiling pyo3 v0.10.1
error: failed to run custom build command for `pyo3 v0.10.1`
Caused by:
process didn't exit successfully: `C:\Users\User\AppData\Local\Temp\pip-install-35a1h4do\orjson\target\release\build\pyo3-dde0edb355843ae5\build-script-build` (exit code: 1)
--- stderr
Error: "Your Rust target architecture (64-bit) does not match your python interpreter (32-bit)"
warning: build failed, waiting for other jobs to finish...
thread 'rustc' panicked at 'Box<Any>', src\librustc_errors\lib.rs:912:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.46.0-nightly (4fb54ed48 2020-06-14) running on x86_64-pc-windows-msvc
note: compiler flags: -Z mutable-noalias -C opt-level=3 -C panic=abort -C linker-plugin-lto -C codegen-units=1 --crate-type lib
note: some of the compiler flags provided by cargo are hidden
error: build failed
💥 maturin failed
Caused by: Failed to build a native library through cargo
Caused by: Cargo build finished with "exit code: 101": `cargo rustc --message-format json --manifest-path Cargo.toml --lib --release -- -C link-arg=-s`
Running `maturin pep517 build-wheel -i python --manylinux=off --strip=on`
Error: Command '['maturin', 'pep517', 'build-wheel', '-i', 'python', '--manylinux=off', '--strip=on']' returned non-zero exit status 1.
----------------------------------------
ERROR: Failed building wheel for orjson
Failed to build orjson
ERROR: Could not build wheels for orjson which use PEP 517 and cannot be installed directly
Please let me know what could I do? I have installed rustup and set it to nightly. Any help is greatly appreciated Thank you!

Answer 1

The problem is quite clear:
Your Rust target architecture (64-bit) does not match your python interpreter (32-bit)
Either upgrade your Python interpreter to 64 bit, or use rustup to install a 32 bit Rust target
Edit: Here is how you could manually target 32 bit on a x86_64 machine