The os Library , List a file, Create a folder, Renames a file

The os Library

Today's lesson is going to use the os library to create folders and navigate around them.

Previously, we've used os to clear the screen.

Here are a few other things that it can do:

List a file

👉 listdir() will allow you to list all the files:

import os

print(os.listdir()) # Lists all the files in the current directory. Useful for checking that a file is in the folder we think it is.

files = os.listdir()

if "quickSave.txt" not in files:

print("Error: Quick Save not found.")

#Checks if a file is in a directory and outputs an error if not.

Create a folder
👉 Try this code with os.mkdir():

import os

os.mkdir("Hello") # Creates a folder called 'Hello'

Renames a file

👉 os.rename() takes 2 arguments: the file to rename and the new name.

import os
os.rename("myname.txt", "NEW.o")

Comments

CONTINUE COMMAND AND EXIT LINE

The Continue Command The continue command stops executing code in the loop and starts at the top of the loop again. Essentially, we want to kick the user back to the original question. EXAMPLE : while True: print("You are in a corridor, do you go left or right?") direction = input("> ") if direction == "left": print("You have fallen to your death") break elif direction == "right": continue else: print("Ahh! You're a genius, you've won") NOTE : The else statement refers to any input besides left or right (up or esc). Since the user is a winner, we do not want to use break or it would say they have failed. EXIT COMMAND LINE The previous code continues to loop even after the user has won. Let's fix that with the exit() command EXAMPLE: print("Let's play chutes and ladders. Pick ladder or chute.") while...

FOR LOOP , RANGE

FOR LOOP A while loop is perfect to use when we don't know how many times we want the loop to repeat. If we have an idea of how many times we want the loop to repeat, we can use a for loop to loop code in exactly the same way the while loop did. EXAMPLE : for counter in range(10): print(counter) RANGE The range function creates a list of numbers in the range you create. If you only give it one number, it will start at 0 and move to a state where the final number is one less than the number in the brackets. In this case, the final number would be 9 . EXAMPLE : total = 0 for number in range(100) : total += number print(total)

Automate! Automate!

Making this customizable 👉So how about making our search user customizable? In the code below, I have: Asked the user to input an artist (line 14) Tidied up their input (line 15) formatted the search URL as an fString that includes the artist (line 19) Here's tAutomate! Automate! We are so close. I can taste it, folks! Massive kudos on getting this far! Today's lesson, however, will work best if you have one of Replit's paid for features (hacker plan or cycles). Free plan Repls 'fall asleep' after a while. Automation kinda relies on the Repl being always on. If you have hacker plan or you've bought some cycles, then you can enable always on in the drop down menu that appears when you click your Repl name (top left).he code: This is important because when our repl is always running, it can keep track of time and schedule events. 👉 I've set up a simple schedule that prints out a clock emoji every couple of seconds. It works like this: Import schedule librar...

PYTHON SYNTAX

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