我想读取PNG的字节,并修改它们。我已经试过这个代码了:
import codecs
ed = input("Would you like to encode or decode?\n(e/d)> ")
image = input("What image would you like to use?\n> ")
if(ed == 'e'):
imagef = codecs.open(image, encoding = "hex")
imagel = imagef.read()
img = ima
两个python解释器会话。第一个是来自CentOS上的python。第二个版本来自MacOSX10.7上内置的python。为什么第二个会话从\U转义序列中创建长度为2的字符串,并随后出错?
$ python
Python 2.6.6 (r266:84292, Dec 7 2011, 20:48:22)
[GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] on linux2
Type "help", "copyright", "credits" or "license" for more infor
Python的dict.update的文档如下:
Help on method_descriptor:
update(...)
D.update([E, ]**F) -> None. Update D from dict/iterable E and F.
If E is present and has a .keys() method, then does: for k in E: D[k] = E[k]
If E is present and lacks a .keys() method, then does: for k, v in E: D[k]