Python3 Seventh Day (input and output)

How to output a value: 1, expression. The 2,print () function. 3, the Write () function of the file object

The STR () function returns a user-readable representation.

The repr () function returns the expression of the interpreter's late reading. Special characters in special strings can be escaped

Input () function: Enter, return the output object

Read and Write files:

Open (Filename,mode), returns a File object

FileName: File name, Mode: What pattern is open

Mode has the following modes:

r,rb,r+,rb+,w,wb,w+,wb+,a,ab,a+,ab+

R: Read-only mode open

B: Binary Open

W: Write-only mode open

+: Read/write mode

Pickle module:

Basic data serialization and deserialization implemented by pickle

Pickle.dump (Obj,file[,protocol])

Pickle.load (file)

File

file.close (); Close File

File.flush (); Output the in-memory file to a disk file

File.isatty (); Determine if the file is in the terminal

File.next (); Return to the next line

File.read ([size]); Returns the specified number of bytes read, if not specified or negative, all

File.readline ([size]); Read entire line

File.readlines ([sizeint]); Read Sizeint line

File.seek (Offset[,whence]); Set the current location of the file

File.tell (); Returns the current location of the file

File.write (str); write characters

File.writelines (sequence); write multiple lines

file.truncate ([size]); Truncates the file to a size character starting at the beginning of the first character of the file

Error handling

Try

....//To determine if there is a wrong statement

Except (Runtimeerror,typeerror,nameerror):

....//error code to execute

Else

....//code to execute without errors

Finally

....//The statements executed no matter what

Raise exception: Used to throw the specified exception, the exception that is thrown must be a subclass of exception

With expression: The file object in the//with statement block must be a normal way to clean up

....

Python3 Seventh Day (input and output)