Python Learning Notes--open mode for files and object methods for files

1 #in Python, if you want to manipulate a file, you must first get the object of the file. 2 #Example One:3 Print("-------------------------------------------------------------------")4File = Open ("Test.txt","WT")#Here we use the open () function to get the object. 5data ="This is a test file!"6File.write (data)#writing data to a file7File.close ()#Remember to release the file object8 9 #then we came to the directory where the program was located and found that a file named Test.txt was created hereTen #open it and we can see that some data has been written into it.  One Print("-------------------------------------------------------------------") A  - #Here are some of the file's open patterns and Object methods - """ the Open mode of file: - "R": Open file in read-only mode (default) - "W": Open file as written, if file does not exist, create a file if file exists, overwrite existing file - "x": If the file already exists, open with this mode will throw an exception + "A": Open in write mode, append write at end If file exists - "B": Open the file in binary mode + "T": Open the file as text A "+": Read/write mode (can be added to other modes for use) at "U": Universal line break support -  - object method of the file: - file.close () #关闭文件 - F.read ([size=-1]) #从文件读取size个字符, when a size is not given or a negative value is given, all the remaining characters are read and then returned as a string - F.readline ([size=-1]) #从文件中读取并返回一行 (including line terminator), returns a size character if there is a size defined in f.write (str) #将字符串str写入文件 - f.writelines (SPE) #向文件写入字符串序列sep, Sep should be an iterative object that returns a string to F.seek (Offset,from) #在文件中移动文件指针, from (0 for the starting position of the file, 1 for the current position, 2 for the end of the file), OFFSE (the value is the offset of the number of bytes) + F.tell () #返回当前在文件中的位置 - f.truncate ([Size=file.tell ()]) #截取文件到size个字节, the default is to intercept the current position of the file pointer the  * """

Python Learning Notes--open mode for files and object methods for files