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In the docs.opencv.org & opencv2refmanual in the sample folder each function has several sections that each signature belongs to a language.

For example :

Threshold

C++: double threshold(InputArray src, OutputArray dst, double thresh, double maxval, int type)
Python: cv2.threshold(src, thresh, maxval, type[, dst ])! retval, dst
C: double cvThreshold(const CvArr* src, CvArr* dst, double threshold, double max_value, int threshold_
type)
Python: cv.Threshold(src, dst, threshold, maxValue, thresholdType) !None