Python file Write and save

Python uses the open () function to open the file return object:

Open second parameter

"R"	Open a file as read-only
"W"	Open file in Write method, overwrite stored content
"X"	Open throws an exception if the file is present
A	Opens the file in write mode and, if it exists, adds the file at the end
"B"	Open a file in binary mode
"T"	Open a file in text mode (default)
"+"	Read/write mode (can be added to other modes)
U	Universal Line break support

Methods for file objects :

Close ()	Close File
Read (Size=-1)	Reads a size character from a file, reads all remaining characters when not given a size or a given negative value, and then returns the string back as a character
ReadLine ()	Reads a whole line of string from a file
Write (str)	Writes the string str to the file
Writelines (seq)	To write a string sequence to a file seq,seq should be an iterative object that returns a string
Seek (Offset,from)	Move the file pointer in the file, from the from (0 for the file start position, 1, for the current position, 2 for the end of the file) offset by offsets bytes
Tell ()	Returns the current position in the file

Read and locate the file:

1>>>f=open ("d:/text File/1.txt")2>>>F.read ()3 'Hello, friends \nhello friend'4>>>F.tell ()5246>>>f.seek (0,0)#set the file pointer to the starting position7 08>>>f.read (5)#read 5 bytes per byte9 'Hello, friend.'   Ten  One>>> F.readline ()#reads a line (that is, from the text pointer to \ n) A 'Hello, friend \ n'    
13
14
>>>f.seek (0,0)
>>>for Each_line in F:
Print (Each_line) #使用迭代来返回每一行文本

Write to File:

If you write to a file, make sure that you open it in "w" or "a" mode, and then tune the writer () function

1 f=open ("d:/text file/1.txt", "w")23 f.write ("  Hello everyone ")45 f.close ()

Actual combat:

Python file Write and save