C:\Users\Lenovo>pip import cv2 ERROR: unknown command "import"

您输入的命令不正确。在 Windows 操作系统的命令行中，使用 `pip install` 命令来安装 Python 包。请尝试以下命令：

pip install opencv-python

这将安装 OpenCV 库，使您能够在 Python 中使用它。

相关问题

>>> pip list File "<stdin>", line 1 pip list ^^^^ SyntaxError: invalid syntax >>>

It looks like you are trying to run the "pip list" command inside the Python interpreter, which is causing a syntax error.

To use the "pip list" command, you need to run it from the command line or terminal outside of the Python interpreter.

Try opening a new terminal window and entering "pip list" there. This should display a list of all the packages installed in your Python environment.

C:\Users\Administrator>pip install --upgrade pdfminer3k Requirement already satisfied: pdfminer3k in d:\lib\site-packages (1.3.4) Requirement already satisfied: ply in d:\lib\site-packages (from pdfminer3k) (3.11) [notice] A new release of pip is available: 23.0.1 -> 23.1.2 [notice] To update, run: python.exe -m pip install --upgrade pip C:\Users\Administrator>

看来你的pdfminer3k库已经是最新版了，所以问题可能不在库版本上。

你可以尝试重新安装pdfminer3k库，使用以下命令：

pip uninstall pdfminer3k
pip install pdfminer3k

如果仍然出现相同的错误，请尝试使用pdfminer.six库。可以使用以下命令进行安装：

pip install pdfminer.six

然后使用以下代码进行文本提取：

from pdfminer.high_level import extract_text

# 读取PDF文档中的文字
text = extract_text('example.pdf')

# 输出提取的文字
print(text)