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Check argument tyope : this program is good

img = np.zeros((256,256,3),np.uint8)
 x = cv.putText(img,'test',(100,10), cv.FONT_HERSHEY_SIMPLEX, 1.0,(255,255,255),lineType=cv.LINE_AA)

but this is wrong :

x = cv.putText(img,['test'],(100,10), cv.FONT_HERSHEY_SIMPLEX, 1.0,(255,255,255),lineType=cv.LINE_AA)
 File "<stdin>", line 1, in <module>
TypeError: bad argument type for built-in operation

or this one

 x = cv.putText(img,49,(100,10), cv.FONT_HERSHEY_SIMPLEX, 1.0,(255,255,255),lineType=cv.LINE_AA)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: bad argument type for built-in operation

Check argument tyope type : this program is good

img = np.zeros((256,256,3),np.uint8)
 x = cv.putText(img,'test',(100,10), cv.FONT_HERSHEY_SIMPLEX, 1.0,(255,255,255),lineType=cv.LINE_AA)

but this is wrong :

x = cv.putText(img,['test'],(100,10), cv.FONT_HERSHEY_SIMPLEX, 1.0,(255,255,255),lineType=cv.LINE_AA)
 File "<stdin>", line 1, in <module>
TypeError: bad argument type for built-in operation

or this one

 x = cv.putText(img,49,(100,10), cv.FONT_HERSHEY_SIMPLEX, 1.0,(255,255,255),lineType=cv.LINE_AA)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: bad argument type for built-in operation