'r' 和'w'什么意思

zxc123qwe

file1 = open(r'C:\windons\temp\readme.txt','r')
myfile = open('C:\\new\\text.dat','w')
逗号后的’r‘，’w‘从哪来的，什么意思?

hldh214

第二个参数表示模式, 看文档

1. Character Meaning
   
2. 'r' open for reading (default)
   
3. 'w' open for writing, truncating the file first
   
4. 'x' open for exclusive creation, failing if the file already exists
   
5. 'a' open for writing, appending to the end of the file if it exists
   
6. 'b' binary mode
   
7. 't' text mode (default)
   
8. '+' open a disk file for updating (reading and writing)
   
9. 'U' universal newlines mode (deprecated)
   

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zxc123qwe

hldh214 发表于 2016-3-19 12:15
第二个参数表示模式, 看文档

谢谢！