python27formac

① 怎麼讓mac終端輸入python默認打開python3

首先得去Python官網下載mac版的Python 34並安裝。 安裝好了很簡單，在終端中輸入」python3″命令即可切換到Python 3版本，但是問題又來了，怎麼在終端中用Python 3運行py文件。 因為在終端輸入」python –version」顯示的始終是27的版本，即使輸入」怎麼讓mac終端輸入python默認打開python3

② mac本使用opencv打開攝像頭導致python意外退出

我再win上測試沒有問題，
import cv2
cap = cv2.VideoCapture(0)
while 1:
ret, frame = cap.read()
k = cv2.waitKey(1)
if k == 27:
break
cv2.imshow("capture", frame)
cap.release()
cv2.destroyAllWindows()
實在不行試試cv+pygame
代碼如下：
import pygame
import cv2

cap = cv2.VideoCapture(0)
ret, img = cap.read()
if not ret:
print("Can't read stream")

img = cv2.transpose(img)
print('shape:', img.shape)
pygame.init()
screen = pygame.display.set_mode((img.shape[0],img.shape[1]))
surface = pygame.surface.Surface((img.shape[0], img.shape[1]))
running = True
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
ret, img = cap.read()
if not ret:
running = False
break
else:
img = cv2.transpose(img)
pygame.surfarray.blit_array(surface, img)
screen.blit(surface, (0,0))

pygame.display.flip()
pygame.quit()