python open的用法_python 中open()的用法？

2017-05-19 回答

r表示只读,b表示二进制

与此对应的是w表示可写，t表示文本方式打开。

再增加一些官方的解释:

>>> print file.__doc__

file(name[, mode[, buffering]]) -> file object

open a file. the mode can be 'r', 'w' or 'a' for reading (default),

writing or appending. the file will be created if it doesn't exist

when opened for writing or appending; it will be truncated when

opened for writing. add a 'b' to the mode for binary files.

add a '+' to the mode to allow simultaneous reading and writing.

if the buffering argument is given, 0 means unbuffered, 1 means line

buffered, and larger numbers specify the buffer size. the preferred way

to open a file is with the builtin open() function.

add a 'u' to mode to open the file for input with universal newline

support. any line ending in the input file will be seen as a '\n'

in python. also, a file so opened gains the attribute 'newlines';

the value for this attribute is one of none (no newline read yet),

'\r', '\n', '\r\n' or a tuple containing all the newline types seen.