在python中安装ccxt模块时出现常量错误

Question

python新手，但不熟悉编码，只熟悉安装模块。使用py-m pip install ccxt安装ccxt时，它似乎走得很远，但它总是抛出一个错误：

ERROR: Command errored out with exit status 1:
 command: 'C:\Users\samib\AppData\Local\Programs\Python\Python39\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\samib\\AppData\\Local\\Temp\\pip-install-7wa5a9m4\\pycares_61a5dda285624907b00263dfe14e0ed6\\setup.py'"'"'; __file__='"'"'C:\\Users\\samib\\AppData\\Local\\Temp\\pip-install-7wa5a9m4\\pycares_61a5dda285624907b00263dfe14e0ed6\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\samib\AppData\Local\Temp\pip-record-yolmpi02\install-record.txt' --single-version-externally-managed --compile --install-headers 'C:\Users\samib\AppData\Local\Programs\Python\Python39\Include\pycares'
     cwd: C:\Users\samib\AppData\Local\Temp\pip-install-7wa5a9m4\pycares_61a5dda285624907b00263dfe14e0ed6\
Complete output (17 lines):
running install
running build
running build_py
creating build
creating build\lib.win-amd64-3.9
creating build\lib.win-amd64-3.9\pycares
copying src\pycares\errno.py -> build\lib.win-amd64-3.9\pycares
copying src\pycares\utils.py -> build\lib.win-amd64-3.9\pycares
copying src\pycares\_version.py -> build\lib.win-amd64-3.9\pycares
copying src\pycares\__init__.py -> build\lib.win-amd64-3.9\pycares
copying src\pycares\__main__.py -> build\lib.win-amd64-3.9\pycares
running build_ext
generating cffi module 'build\\temp.win-amd64-3.9\\Release\\_cares.c'
creating build\temp.win-amd64-3.9
creating build\temp.win-amd64-3.9\Release
building '_cares' extension
error: Microsoft Visual C++ 14.0 is required. Get it with "Build Tools for Visual Studio": https://visualstudio.microsoft.com/downloads/
----------------------------------------
ERROR: Command errored out with exit status 1: 'C:\Users\samib\AppData\Local\Programs\Python\Python39\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\samib\\AppData\\Local\\Temp\\pip-install-7wa5a9m4\\pycares_61a5dda285624907b00263dfe14e0ed6\\setup.py'"'"'; __file__='"'"'C:\\Users\\samib\\AppData\\Local\\Temp\\pip-install-7wa5a9m4\\pycares_61a5dda285624907b00263dfe14e0ed6\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\samib\AppData\Local\Temp\pip-record-yolmpi02\install-record.txt' --single-version-externally-managed --compile --install-headers 'C:\Users\samib\AppData\Local\Programs\Python\Python39\Include\pycares' Check the logs for full command output.

有没有人能用这些机器帮我破译这个，并希望能帮我修复ish

同时，这个问题也处于闲置状态。我的代码是导入ccxt，打印（ccxt.exchanges），这就是我得到的全部信息：

Traceback (most recent call last):
  File "C:/Users/samib/Documents/arbbot.py", line 1, in <module>
    from ccxt import ccxt
  File "C:/Users/samib/Documents\ccxt\__init__.py", line 29, in <module>
    from ccxt.base.exchange import Exchange                     # noqa: F401
  File "C:/Users/samib/Documents\ccxt\base\__init__.py", line 24, in <module>
    from ccxt.base import exchange
  File "C:/Users/samib/Documents\ccxt\base\exchange.py", line 32, in <module>
    from cryptography.hazmat import backends
ModuleNotFoundError: No module named 'cryptography'

Answer 1

要删除该Microsoft Visuallc++错误，您必须从https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=16安装生成工具，稍后您可以执行此操作

pip install cryptography

如您所见，它已安装

Answer 2

正如您的错误消息所说ModuleNotFoundError: No module named 'cryptography'，我将尝试安装that module：

pip install cryptography