Python basic syntax--file reading and writing

#Also known as IO stream, it is divided into two directions 
: reading files and writing files. #Reading files: inputstream input stream, reads the files on the disk into the program for processing (in memory) 
#Write files: outputstream output stream, transfers the files into the program The file is written to the disk 
#File reading and writing, that is, the exchange data between disk and memory 
#Memory: It saves temporary data when the program is running, and it will be cleared when the program is closed 
#Disk: It stores permanent data 
#File classification : 1. Text file: also called character file, which only saves text documents of strings, such as .txt/json/css, etc. 
        #2. Binary file: also called byte file, which can save multimedia data in any format . For example: picture/audio/video/word/excel 
#File operation steps: open read close #1. Read the fileaaa 
="C:\\Users\\yahui.zhao\\Desktop\\aaa.txt"#Don't Forgot to cancel the translation 
file=open("C:\\Users\\yahui.zhao\\Desktop\\aaa.txt", "r")#open (file path name, access mode) r--read file 
#Must not Forgot the double quotes of r 
data=file.read()#Read the file 
file.close()#Close the file 
print(data) 
print(type(data))#The text is a string document # 2. Write the file




 
s= "Hello a, Shanghai"
file=open(aaa,"w")#"w", if the file does not exist, create a new file, if the file exists, overwrite the original file, the file path must actually exist file.write(s) file.close() 
# 
Close File 
xixi="Haha, it's not overwritten" 
file=open(aaa,"a")#"a" is not overwritten and directly writes 
file.write(xixi) 
file=open(aaa,"r") 
data=file. read() 
file.close()#Close the file 
print(data) 
#Text file: r,w,a 
#Binary file: rb,wb,ab 

file=open(r"C:\Users\user\Desktop\Enterprise WeChat Screenshot_16557208021155.png","rb") 
data=file.read() file.close( 
) 
file1=open(r"C:\Users\user\Desktop\1155.png","wb") 
file1.write (data) 
file1.close() 
file1=open(r"C:\Users\user\Desktop\1155.png","rb") 
data=file1.read() 
print(data) 
#Using the above method, we often forget to close the file, which leads to higher-order methods.
with open("C:\\Users\\yahui.zhao\\Desktop\\666.txt","r",encoding="utf-8") as file2,open("C:\\Users\\yahui .zhao\\Desktop\\aaa666.txt","w",encoding="utf-8") as file3: 
    data=file2.read() 
    file3.write(data)
#Note: write can only write string types, not dict, list and other types.