Python file Operations

I. Use of file operations

1. Open a file and read the contents

Format: Open ("File name", modify the encoding type). Read ()

1 variable = open (" filename ", encoding="utf-8"). Read ()
2 print (variable) #读取文件中内容

Note: windows= default GBK python= default Utf-8

. Read (): Go to memory to read.

Note: Without specifying the encoding type, Windows will point to GBK by default.

. Read (): R = Read

2. Overwrite the content, or create a new file to write to.

Format: Open ("File name", "W", modify the Encoding type): W is the creation of a new file that exists directly within the file.

1 variable = open (" filename ",' W', encoding="utf-8  ",")     # file handle, Memory object 2 variable. Write (" I love Beijing Tian ' an door, \ n" )                  # Overwrite file contents   

Note: Overwrite the content in the file.

The default is "R" read value without modifying read and write

. Write (): w = Write

3. Append content to the source file

Format: Open ("File name", "a", modify the encoding type): A represents the appended meaning and is unreadable.

1 variable = open (" filename ",'a', encoding="utf-8  ",")     # file handle, Memory object 2 variable. Write (" I love Beijing Tian ' an door, \ n")                  # Overwrite file contents         

Note: Append the content to the file.

Variable. Close: Closes the file.

Two. File operation knowledge Points

Judge

File variable. Writable (): Determines whether the file is writable.

File variable. Readable (): Determines whether the file can be read.

File variable. Seekale: Determines whether the specified character position can be moved.

File variable. Isatty: Determine if the end device is open.

File variable. Closed (): Determines whether the file is open.

Function

File variable. Tell (): Returns the current position value by the number of characters. Some terminals are non-removable.

File variable. Seek (Specified number): Returns to the specified location in the file.

File variable. ReadLines (): Converts to a list, dividing elements by rows.

File variable. Strip (): Remove spaces and carriage returns.

File variable. Truncate (): Specifies that the range is truncated and is emptied without specifying it.

File variable. Flush (): Force flush, write to the hard disk after the flush is written.

File variable. Errors: Exception handling (not available)

File variable. Buffer (): Memory cache file.

File variable. Close (): Frees memory.

View

File variable. Encoding: Print file character encoding.

File variable. ReadLine: Prints the first line of the file.

File variable. Name: Prints the file name.

File variable. Fileno: Print an excuse IO number (not available)

Auto Close

Format: With open ("File name", "Read and write", "Escape Encoding") as variable.

Python file Operations