In the official online CV2 document, check the optional values of OpenCV specific parameters

preparation

Find the opencv Official website ：https://opencv.org/
Find yourself opencv Version of , stay python Import from the file cv2, then print(cv2.\_\_version\_\_)
The name of the parameter you want to find : With putText For example （print(cv2.putText.__doc__)）, see cv::HersheyFonts Value

putText(img, text, org, fontFace, fontScale, color[, thickness[, lineType[, bottomLeftOrigin]]]) -> img
.   @brief Draws a text string.
.   
.   The function putText renders the specified text string in the image. Symbols that cannot be rendered
.   using the specified font are replaced by question marks. See getTextSize for a text rendering code
.   example.
.   
.   @param img Image.
.   @param text Text string to be drawn.
.   @param org Bottom-left corner of the text string in the image.
.   @param fontFace Font type, see cv::HersheyFonts.
.   @param fontScale Font scale factor that is multiplied by the font-specific base size.
.   @param color Text color.
.   @param thickness Thickness of the lines used to draw a text.
.   @param lineType Line type. See the line for details.
.   @param bottomLeftOrigin When true, the image data origin is at the bottom-left corner. Otherwise,
.   it is at the top-left corner.

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Reference resources ： Offline documents https://blog.csdn.net/qq_15099895/article/details/108054618
In the second step above , Download offline documents , stay Local decompression , In the local folder find index.html double-click After opening Will open the browser It is the same as the online document interface, but the local files read , The search method is the same