Python入門 openを使ったファイルの読み書きの方法

f = open('test001.txt','r',encoding='utf-8') #open means open, () is the path of the file to open 'r' is a read-only way to open, open the value assigned to f, if the read file has Chinese, encoding = utf-8 is the encoding format

print(f.read()) #read is the meaning of read, f,read() is to read all the data in f, and then print the output

f.close() #read and then close the open f, close() is the meaning of close, remember to close

try: # First try, if there is an error after the program opens and reads a series of operations after opening, then do not interrupt the program

    f = open('test001.txt','r',encoding='utf-8')

    file = f.read()

    print(file)

finally: # Whether or not there is an error in the program in try, then the following closure is executed

    if f: # determine if f is open, if not then no need to close, open then close

        f.close()

with open('test001.txt','r',encoding='utf-8') as f:

    file = f.read()

    print(file)

f = open('test001.txt','w',encoding='utf-8') #open Open the file to be written, 'w' means write, if there is Chinese encoding for encoding

f.write('The weather in Beijing today is very good ！！！！') #write means write, write the content in () to the f file

f.close() #close after writing

with open('test001.txt','w',encoding='utf-8') as f: #use the with method

    f.write('Go for a cassoulet today ！！！！')  # Write directly to