python-open函数

open函数，该函数用于文件处理

操作文件时，一般需要经历如下步骤：

打开文件
操作文件

一、打开文件

1	文件句柄 = open('文件路径', '模式')

打开文件时，需要指定文件路径和以何等方式打开文件，打开后，即可获取该文件句柄，日后通过此文件句柄对该文件操作。

打开文件的模式有：

r，只读模式（默认）。
w，只写模式。【不可读；不存在则创建；存在则删除内容；】
a，追加模式。【可读；不存在则创建；存在则只追加内容；】

"+" 表示可以同时读写某个文件

r+，可读写文件。【可读；可写；可追加】
w+，写读
a+，同a

"U"表示在读取时，可以将 \r \n \r\n自动转换成 \n （与 r 或 r+ 模式同使用）

"b"表示处理二进制文件（如：FTP发送上传ISO镜像文件，linux可忽略，windows处理二进制文件时需标注）

rb
wb
ab
class TextIOWrapper(_TextIOBase):

"""

Character and line based layer over a BufferedIOBase object, buffer.

encoding gives the name of the encoding that the stream will be

decoded or encoded with. It defaults to locale.getpreferredencoding(False).

errors determines the strictness of encoding and decoding (see

help(codecs.Codec) or the documentation for codecs.register) and

defaults to "strict".

newline controls how line endings are handled. It can be None, '',

'\n', '\r', and '\r\n'. It works as follows:

* On input, if newline is None, universal newlines mode is

enabled. Lines in the input can end in '\n', '\r', or '\r\n', and

these are translated into '\n' before being returned to the

caller. If it is '', universal newline mode is enabled, but line

endings are returned to the caller untranslated. If it has any of

the other legal values, input lines are only terminated by the given

string, and the line ending is returned to the caller untranslated.

* On output, if newline is None, any '\n' characters written are

translated to the system default line separator, os.linesep. If

newline is '' or '\n', no translation takes place. If newline is any

of the other legal values, any '\n' characters written are translated

to the given string.

If line_buffering is True, a call to flush is implied when a call to

write contains a newline character.

"""

def close(self, *args, **kwargs): # real signature unknown

关闭文件

pass

def fileno(self, *args, **kwargs): # real signature unknown

文件描述符

pass

def flush(self, *args, **kwargs): # real signature unknown

刷新文件内部缓冲区

pass

def isatty(self, *args, **kwargs): # real signature unknown

判断文件是否是同意tty设备

pass

def read(self, *args, **kwargs): # real signature unknown

读取指定字节数据

pass

def readable(self, *args, **kwargs): # real signature unknown

是否可读

pass

def readline(self, *args, **kwargs): # real signature unknown

仅读取一行数据

pass

def seek(self, *args, **kwargs): # real signature unknown

指定文件中指针位置

pass

def seekable(self, *args, **kwargs): # real signature unknown

指针是否可操作

pass

def tell(self, *args, **kwargs): # real signature unknown

获取指针位置

pass

def truncate(self, *args, **kwargs): # real signature unknown

截断数据，仅保留指定之前数据

pass

def writable(self, *args, **kwargs): # real signature unknown

是否可写

pass

def write(self, *args, **kwargs): # real signature unknown

写内容

pass

def __getstate__(self, *args, **kwargs): # real signature unknown

pass

def __init__(self, *args, **kwargs): # real signature unknown

pass

@staticmethod # known case of __new__

def __new__(*args, **kwargs): # real signature unknown

""" Create and return a new object. See help(type) for accurate signature. """

pass

def __next__(self, *args, **kwargs): # real signature unknown

""" Implement next(self). """

pass

def __repr__(self, *args, **kwargs): # real signature unknown

""" Return repr(self). """

pass

buffer = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

closed = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

encoding = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

errors = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

line_buffering = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

name = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

newlines = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

_CHUNK_SIZE = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

_finalizing = property(lambda self: object(), lambda self, v: None, lambda self: None) # default

巴特西

python-open函数

最新文章

热门文章