Reading and writing of files in python (2)

Xiao R didn't have time to learn python yesterday because he was studying the loopholes in weblogic (well, these are all excuses, I'm lazy, everyone can't be like me. I have to insist on learning every day). This progress is a bit slow. Oops, it's okay, I'm still young, only 20 years old. Haha, just kidding.

Today, I continued to learn python file reading and writing, and found a fairly interesting code. Interesting code will be discussed at the end of this article.

 This is the file of 1234.txt

Executing this sentence returns 0.

 

Then:

result:

 

Understand the role of the code yourself.

Now let's introduce a few lines of code to make a progress bar. Everyone must have played the game, right? When you enter, there will be a progress bar that slowly increases, and this function can be achieved with a few words of python.

Source code: (source code is rarely introduced)

Import sys,time

for i in range(100):

　　sys.stdout.write("*")

　　sys.stdout.flush()

　　time.sleep(0.1)