diy.py

# app=open(r"C:\Users\Administrator\Desktop\app.txt","a",encoding="utf-8")
# app.write('sb,x本\n')
# app.close()
# with open(r"C:\Users\Administrator\Desktop\app.txt","a",encoding="utf-8") as app:
#     app.write('切尔西:12本\n')
app=open(r"C:\Users\Administrator\Desktop\app.txt","r",encoding="utf-8")
a=app.read()
print(a)
app.close()