'w' open for writing, truncating the file first 写入:打开文件用于写入,如果文件不存在则创建文件,如果文件存在,则后写入内容覆盖之前内容 'x' create a new file and open it for writing 写入:创建一个新文件,并且打开写入内容(打开文件以进行独占创建。如果文件已经存在,则操作失败。) 'a' open for writ...
open(file, mode='r', buffering=None, encoding=None, errors=None, newline=None, closefd=True) 其中mode列表为: 'r'#open for reading (default)'w'#open for writing, truncating the file first'x'#create a new file and open it for writing,python3新增'a'#open for writing, appending to t...
file:文件名称; mode:制定了文件打开的方式,函数提供了如下方式,其中,‘rt‘为默认方式。 ‘r‘ open for reading (default)——只读,默认方式 ‘w‘ open for writing, truncating the file first——写入,会覆盖源文件内容 ‘x‘ create a new file and open it for writing——创建新文件,并写入内容,如...
open(name[,mode[,buffering]]) mode 'r' #open for reading (default) 文件指针会在文件开头。默认模式 'w' #open for writing, truncating the file first,只用于写入。如文件已存在,write 会覆盖全部文件,类似 linux 的 echo > filename,若文件不存在,创建文件。 'x' #create a new file and open i...
open for writing, truncating the file first ‘a' open for writing, appending to the end of the file if it exists ‘b' binary mode ‘t' text mode (default) ‘+' open a disk file for updating (reading and writing) ‘U' universal newline mode (for backwards compatibility; should not ...
open for writing, truncating the file first ‘a’ open for writing, appending to the end of the file if it exists ‘b’ binary mode ‘t’ text mode (default) ‘+’ open a disk file for updating (reading and writing) ‘U’ universal newline mode (for backwards compatibility; should no...
'w' open for writing, truncating the file first 'x' create a new file and open it for writing 'a' open for writing, appending to the end of the file if it exists 'b' binary mode 't' text mode (default) '+' open a disk file for updating (reading and writing) ...
'r' open for reading (default) 'w' open for writing, truncating the file first 'x' create a new file and open it for writing 'a' open for writing, appending to the end of the file if it exists 'b' binary mode 't' text mode (default) ...
'r' open for reading (default) 'w' open for writing, truncating the file first 'x' create a new file and open it for writing 'a' open for writing, appending to the end of the file if it exists 'b' binary mode 't' text mode (default) ...
'r' open for reading (default) 'w' open for writing, truncating the file first 'x' open for exclusive creation, failing if the file already exists 'a' open for writing, appending to the end of the file if it exists 'b' binary mode 't' text mode (default) '+' open a disk file...