Section VI: File Operations

read read the entire contents of the file, the default mode is read, it is not necessary to specify modes:

f = open('test2.py',encoding='utf8')
data = f.read()
print(data)
f.close()

Single line redline read the file, when printing plus end = '' Otherwise there will be a space:

f = open('test2.py',encoding='utf8')
data = f.readline()
data1 = f.readline()
print(data,end='')
print(data1,end='')

f.close()

Readlines read the entire contents of a list of ways to print each line, each element is a row

f = open('test2.py',encoding='utf8')
data = f.readlines()
print(data)

f.close()

write write if the file exists is empty, if there is no new file is created, the file contents must be a string :

f = open('test3.py','w',encoding='utf8')
f.write("写文件")
f.close()

writelines written in the form of a list, write multiple lines when I remember to add \ n

f = open('test3.py','w',encoding='utf8')
f.writelines(["dsad\n","dsad\n"])
f.close()

a append operation:

f = open('test3.py','a',encoding='utf8')
f.writelines(["dsad\n","dsad\n"])
f.close()

r + opened readable and writable, writing time to start writing from the beginning of where the cursor

f = open('test3.py','r+',encoding='utf8')
print(f.read())
f.writelines(["dsad\n","dsad\n"])
f.close()

with as colleagues open multiple files, do not need to close to close the file, \ newline

with open('test3.py','r',encoding='utf8') as f,\
        open('test2.py','r',encoding='utf8') as g:
        print(f.read())
        print(g.read())