Python 报错集锦

1.Python3 报错AttributeError: module 'enum' has no attribute 'IntFlag'

Fatal Python error: initsite: Failed to import the site module
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/site.py", line 73, in <module>
    __boot()
  File "/usr/local/lib/python2.7/site-packages/site.py", line 26, in __boot
    import imp  # Avoid import loop in Python >= 3.3
  File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/imp.py", line 27, in <module>
    import tokenize
  File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/tokenize.py", line 33, in <module>
    import re
  File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/re.py", line 143, in <module>
    class RegexFlag(enum.IntFlag):
AttributeError: module 'enum' has no attribute 'IntFlag'

解决办法：
Terminal键入如下命令

unset PYTHONPATH

当然，这是头疼医头脚疼医脚的办法，并不能从根本上解决问题，要想从根本上解决问题，就得更改，.zshrc或则.bashrc中的PYTHONPATH路径
eg：

export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/site-packages

折腾了好几天终于把Python、pip 、pip3、PyCharm、ipython折腾明白了。。。。

2.Python默认编码错误SyntaxError: Non-ASCII character '\xe5'

代码

import cv2.cv as cv

im = cv.LoadImage('/Users/heyu/Pictures/picture/QQ20171118-0.jpg', cv.CV_LOAD_IMAGE_COLOR)
res = cv.CreateImage(cv.GetSize(im), cv.CV_8UC2)

cv.Convert(im, res)
cv.ShowImage("Converted", res)
res2 = cv.CreateImage(cv.GetSize(im, cv.CV_CV_8UC2, 3))
cv.CvtColor(im, res2, cv.CV_RGB2BGR) # HLS, HSV,YCrCb, ...
cv.ShowImage("CvtColor", res2)
cv.WaitKey(0)
'''
cv.Convert():#将图片从一个颜色空间转到另一个颜色空间
cv.CvtColor(src, dst, code)：
cv2:
cv2.cvtColor(input_image, flag) # 函数实现图片颜色空间的转换，flag 参数决定变换类型。如 BGR->Gray flag 就可以设置为 cv2.COLOR_BGR2GRAY 。
'''

Terminal中键入

python color_transformation.py  

出现如下报错

  File "color_transformation.py", line 13
SyntaxError: Non-ASCII character '\xe5' in file color_transformation.py on line 17, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details

解决方法：
Python的默认编码文件是用的ASCII码，你将文件存成了UTF-8！！！（文件中存在中文或者其他语言，就会出现此问题！）
解决办法很简单！！！
在文件开头加入：

# -*- coding: UTF-8 -*-    或者  #coding=utf-8

（注：此语句一定要添加在源代码的第一行）