【无标题】ERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed direct

sudo pip3 install --upgrade pip

      =============================DEBUG ASSISTANCE=============================
      If you are seeing a compilation error please try the following steps to
      successfully install cryptography:
      1) Upgrade to the latest pip and try again. This will fix errors for most
         users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
      2) Read https://cryptography.io/en/latest/installation/ for specific
         instructions for your platform.
      3) Check our frequently asked questions for more information:
         https://cryptography.io/en/latest/faq/
      4) Ensure you have a recent Rust toolchain installed:
         https://cryptography.io/en/latest/installation/#rust
  
      Python: 3.8.2
      platform: Linux-5.4.18-35-generic-aarch64-with-glibc2.29
      pip: n/a
      setuptools: 62.1.0
      setuptools_rust: 1.3.0
      =============================DEBUG ASSISTANCE=============================
  
  error: can't find Rust compiler
  
  If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler.
  
  To update pip, run:
  
      pip install --upgrade pip
  
  and then retry package installation.
  
  If you did intend to build this package from source, try installing a Rust compiler from your system package manager and ensure it is on the PATH during installation. Alternatively, rustup (available at https://rustup.rs) is the recommended way to download and update the Rust compiler toolchain.
  
  This package requires Rust >=1.41.0.
  ----------------------------------------
  ERROR: Failed cleaning build dir for cryptography
Failed to build cryptography
ERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed directly

针对错误问题，如果尝试了其他解决办法还不行，那试一试升级pip。

通过sudo pip3 install --upgrade pip就可以了。