Detailed explanation of python3 file operation steps
Steps: Open the file - "Operate the file -" Close the file
Open the file
文件句柄 = open('文件路径', '模式')Specify the file encoding
文件句柄= open('文件路径','模式',encoding='utf-8')In order to prevent forgetting to close the file, you can Use the context manager to open the file
with open('文件路径','模式') as 文件句柄:<br>
The modes for opening files are:
r, read-only mode (default).
w, write-only mode. [Unreadable; create if it does not exist; delete the content if it exists;]
a, append mode. [Readable; if it does not exist, create it; if it exists, only append the content;]
r+, the file can be read and written. [Readable; Writable; Appendable]
w+, write and read
"U" means that when reading, you can r \n \r\n is automatically converted to \n (same as r or r+ mode)
rU
r+U
"b" means processing binary files (such as: FTP sending and uploading ISO image files, Linux can be ignored, Windows needs to be marked when processing binary files)
rb
- ##wb ##ab
文件句柄.close()
Operation file:
detach
#占位
fileno (return file descriptor, used for I/O operations of the underlying operating system)
fid = 文件句柄.fileno()print(fid)
flush (refresh buffer , write the data in the buffer to the file immediately)
文件句柄.flush()
isatty (determine whether the file is connected to a terminal device, return a Boolean value)
文件句柄.isatty()
read (read the specified data from the file Number of characters, read all by default)
str = 文件句柄.read() #读取整个文件str1 = 文件句柄.read(10) #读取文件前10个字符
readable (determine whether the file is readable, return a Boolean value)
文件句柄.readable()
readline (read at most one line of data at a time, each line contains a newline at the end symbol '\n')
print(文件句柄.readline()) #读取第一行数据print(文件句柄.readline(3)) #读取第二行前3个字符print(文件句柄.readline()) #读取第二行剩余字符print(文件句柄.readline()) #读取第三行
seek (Move the pointer for file reading. If the file contains Chinese characters, the moving pointer must be a multiple of 3, otherwise an error will be reported, because one Chinese character is equal to 3 bytes)
文件句柄.seek(6)
seekable (determine whether the file pointer is available, return a Boolean value)
文件句柄.seekable()
tell (get the pointer position)
文件句柄.tell()
truncate (truncate, delete the content behind the pointer, And write to the file, operate in writable mode)
f = open('text.txt','r+',encoding='utf-8')
f.seek(9) #把指针移动到第9个字节后面（即第3个中文后面）f.truncate() #把第3个中文后面的字符删除，并写入文件f.close()writable (determine whether the file is writable, return a Boolean value)
文件句柄.writable()
write (write the string to the file, and return Number of characters)
文件句柄.write('字符串')The above is the detailed content of Detailed explanation of python3 file operation steps. For more information, please follow other related articles on the PHP Chinese website!
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