VSCode出现ERROR: Could not find a version that satisfies the requirement cv2 (from versions: none)错误

1. pip install cv2

刚开始因下载cv2时，可能因为网络原因，导致时间超出，所以使用pip install --default-timeout=1000 cv2，但是发现出现如下错误：

PS F:\py代码> pip install --default-timeout=1000 cv2
ERROR: Could not find a version that satisfies the requirement cv2 (from versions: none)
ERROR: No matching distribution found for cv2

然后我又试了下pip install cv2，发现还是出现如下错误：

PS F:\py代码> pip install cv2
ERROR: Could not find a version that satisfies the requirement cv2 (from versions: none)
ERROR: No matching distribution found for cv2

2. pip install opencv-python

然后发现opencv中的cv2在opencv-python包里面，所以可以用pip install opencv-python，但是可能因为网络原因，导致时间超出，可能会出现如下错误：

PS F:\py代码> pip install opencv-python
>>
Collecting opencv-python
  Downloading opencv_python-4.3.0.36-cp38-cp38-win_amd64.whl (33.4 MB)
     |█                               | 942 kB 3.3 kB/s eta 2:45:35ERROR: Exception:
Traceback (most recent call last):
  File "f:\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 425, in _error_catcher
    yield
  File "f:\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 507, in read
    data = self._fp.read(amt) if not fp_closed else b""
  File "f:\python\lib\site-packages\pip\_vendor\cachecontrol\filewrapper.py", line 62, in read
    data = self.__fp.read(amt)
  File "f:\python\lib\http\client.py", line 454, in read
    n = self.readinto(b)
  File "f:\python\lib\http\client.py", line 498, in readinto
    n = self.fp.readinto(b)
  File "f:\python\lib\socket.py", line 669, in readinto
    return self._sock.recv_into(b)
  File "f:\python\lib\ssl.py", line 1241, in recv_into
    return self.read(nbytes, buffer)
  File "f:\python\lib\ssl.py", line 1099, in read
    return self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "f:\python\lib\site-packages\pip\_internal\cli\base_command.py", line 188, in _main
    status = self.run(options, args)
  File "f:\python\lib\site-packages\pip\_internal\cli\req_command.py", line 185, in wrapper
    return func(self, options, args)
  File "f:\python\lib\site-packages\pip\_internal\commands\install.py", line 332, in run
    requirement_set = resolver.resolve(
  File "f:\python\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 179, in resolve
    discovered_reqs.extend(self._resolve_one(requirement_set, req))
  File "f:\python\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 362, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "f:\python\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 314, in _get_abstract_dist_for
    abstract_dist = self.preparer.prepare_linked_requirement(req)
  File "f:\python\lib\site-packages\pip\_internal\operations\prepare.py", line 467, in prepare_linked_requirement
    local_file = unpack_url(
  File "f:\python\lib\site-packages\pip\_internal\operations\prepare.py", line 255, in unpack_url
    file = get_http_url(
  File "f:\python\lib\site-packages\pip\_internal\operations\prepare.py", line 129, in get_http_url
    from_path, content_type = _download_http_url(
  File "f:\python\lib\site-packages\pip\_internal\operations\prepare.py", line 281, in _download_http_url
    for chunk in download.chunks:
  File "f:\python\lib\site-packages\pip\_internal\cli\progress_bars.py", line 166, in iter
    for x in it:
  File "f:\python\lib\site-packages\pip\_internal\network\utils.py", line 15, in response_chunks
    for chunk in response.raw.stream(
  File "f:\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 564, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "f:\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 529, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "f:\python\lib\contextlib.py", line 131, in __exit__
    self.gen.throw(type, value, traceback)
  File "f:\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 430, in _error_catcher
    raise ReadTimeoutError(self._pool, None, "Read timed out.")
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.

2. pip install --default-timeout=1000 opencv-python

使用pip install --default-timeout=1000 opencv-python，可能会出现错误，错误界面如下：

ERROR: THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS FILE. If you have updated the package versions, please update the hashes. Otherwise, examine the package contents carefully; someone may have tampered with them.
    opencv-python from https://files.pythonhosted.org/packages/11/d7/5771585ed77ff194d8b7d2e0f32c83af1aafbbdb15357adc8f09dd37dbfa/opencv_python-4.3.0.36-cp38-cp38-win_amd64.whl#sha256=1ea08f22246ccd33174d59edfa3f13930bf2c28096568242090bd9d8770fb8a8:
        Expected sha256 1ea08f22246ccd33174d59edfa3f13930bf2c28096568242090bd9d8770fb8a8
             Got        15a085ffd233b3b04ea4febe3933f737f92deeee6e0fedbccd3fc4a07fd88930

如果不能正确安装可以多安装几次，即可，正确安装界面如下：

PS F:\py代码> pip install --default-timeout=1000 opencv-python
Collecting opencv-python
  Downloading opencv_python-4.3.0.36-cp38-cp38-win_amd64.whl (33.4 MB)
     |████████████████████████████████| 33.4 MB 24 kB/s
Requirement already satisfied: numpy>=1.17.3 in f:\python\lib\site-packages (from opencv-python) (1.18.5)
Installing collected packages: opencv-python
Successfully installed opencv-python-4.3.0.36

本文地址：https://blog.csdn.net/qq_40279192/article/details/107437431