Windows 10 64位系统下如何安装PyYAML？现有方案均无效

Hey there, let's work through this PyYAML installation headache you're dealing with on Windows 10 64-bit! Multiple Python versions can definitely throw a wrench in things, so let's break down the fixes step by step:

Step 1: Make sure you're using the right pip for your target Python version #

Since you have multiple Python installs (3.2 through 3.6), your pip3 command might be pointing to a different Python version than you think. To confirm:

• Open Command Prompt and run:

  pip3 --version
  

  Check the output path—if it's not pointing to your Python 3.5 installation (e.g., C:\Python35\Scripts\pip.exe), you'll need to use the absolute path to the correct pip executable instead of just pip3. For example:

  C:\Python35\Scripts\pip.exe install --upgrade PyYAML
  

Step 2: Verify your wheel file matches your Python's exact ABI and architecture #

The "wheel not supported on this platform" error usually means the wheel file you downloaded doesn't align with your Python's build details. For Python 3.5 on Windows 64-bit:

• Ensure the wheel filename follows the pattern PyYAML-<version>-cp35-cp35m-win_amd64.whl—the cp35m part is crucial (it indicates CPython 3.5 with pymalloc, which is standard for Windows builds).
• If you tried a wheel without the m (like cp35 instead of cp35m), that's likely the issue. Double-check the wheel you download matches your Python's exact tag—you can confirm your Python's tag by running this in a Python 3.5 shell:

  import sysconfig
  print(sysconfig.get_config_var('SOABI'))
  

  For Python 3.5 64-bit Windows, this should output cp35-win_amd64 or cp35m-win_amd64.

Step 3: Try installing without pre-built wheels (source installation) #

If wheel files keep failing, you can force pip to install from source. Note: This might require having the Visual C++ Build Tools installed (for compiling the C extensions), but PyYAML also has a pure-Python fallback that should work even without build tools. Run:

C:\Python35\Scripts\pip.exe install --no-binary :all: PyYAML==3.12

Step 4: Clean up old installations first #

Sometimes leftover partial installs can cause conflicts. Uninstall any existing PyYAML versions first to start fresh:

C:\Python35\Scripts\pip.exe uninstall -y PyYAML

Then retry the upgrade or wheel installation.

Quick Tip: Run Command Prompt as Administrator #

Occasionally, permission issues can block pip from writing to Python's installation directory. Right-click Command Prompt and select "Run as administrator" before executing your install commands to rule this out.

内容的提问来源于stack exchange，提问作者Micoloth