Python Programming Tutorial - 23 - How to Read and Write Files

[morgansippel]

i almost discontinued your tutorials. Im so grateful you enlarged your font. I hope the other tutorials utilize the larger size. Thanks for all the help. Now if I use a regular text editor and throw it in theater mode I can watch and code at the same time.

[librasaur]

This seriously one of the best tutorial finds ever! Thank you so much!!!

[AntonioSantos-vezv]

I have watched a couple of tuts, but it's hard understand this exact open, write, read and close....
You can make the learning incredibly easy. You got a special talent, man! Thanks a bunch!
Cheers from Northeastern Brazil!

[jasonspeziale]

This really is the greatest tutorials on the fricking planet.

[usqgi]

Seriously why should I bother with Java when I have Python. It's so freaking amazing.

[proccessingunit]

Using all of my knowledge that I have gathered so far(and a little bit of discovery), I have made this simple guessing game in about an hour:
import random
import time

num = random.randrange(1, 10)


def game():
    choice = input("\nGuess a number between 1 and 100 ")
    int(choice)
    if choice is num:
        print("Checking...")
        time.sleep(1)
        print("You win!")
        print("The number was:", str(num))
    else:
        print("\nChecking...")
        time.sleep(1)
    if num < int(choice):

            lose()
    elif num > int(choice):
            lose()
    else:
        print("\nYou Win!")
        play_again()


def lose():
    print("\nYou lose")
    play_again()


def play_again():
    choice = input("\nPlay again? Y/N ")
    if choice is "Y":
        print("Yay!")
        game()
    elif choice is "N":
        print("\nOkay then...")


game()

[feiprofessor]

The only thing that keep this tutorial from perfect is the font and now it is the complete perfect python tutorial on earth. Thanks a lot.

[lolk]

I have started you tutorials from start and these tutorials are amazing. and I have learned so many things thank you the new Boston

[ompmega]

Since you're using camtasia studio to record, use their zoom tool to zoom into the video

[noway]

Thanks for showing the \n in the strings. I have now made a save writer - here is the code (I import stuff I don't always need in case I need them).

import sys
import random
import os
import time
import fileinput

Save = 1

with open("nextSave.txt", "r") as f:
saves = f.readline()

Data1 = 42
Data2 = 21
saveString = "Save #"+str(saves)+".txt"
savesString = str(int(saves)+1)
WritelineOne = str(Data1)+"\n"
WritelineTwo = str(Data2)

if(Save == 1):
print("Packaging...")
with open(saveString, "w") as f:

with open("nextSave.txt", "w") as g:
g.write(savesString)
print("Save Successfull")


The "nextSave" file is a text file with the next save number inside it. the data variables can be changed, and correspond to the lines. you can add more by changing data2 from "WritelineTwo = str(Data2)" to "WritelineTwo = str(Data2)+"\n", " add a third variable called Data3, then WritelineThree = str(data3) and the should be this goes into a text document.

sorry if the explanation was too long.

[DaCurse]

u can do:
fw.write (".LOG\n")
and then write stuff..
the .LOG makes the txt file registers the date of the last change to the file

[camb]

Used some of your last tutorial to do this.

import random
name = random.randrange(1, 1000)
full_name = "sample" + str(name) + ".txt"
fw = open(full_name, 'w')
fw.write("hello this is just a test \n")
fw.write("more of the test, to write a simple program, so all can enjoy.")
fw.close()

fr = open(full_name, 'r')
text = fr.read()
print(text)
fr.close()

[cas]

Can you also create a file.py? So you can let your programm write it's own programm

[justrandom]

Is there 720p ..
Or is it YouTube fault for not showing
720p
Only 480p is available

[AndreyChezhin]

Guy, you are the best :) Thanks a lot for these short lessons!

[Eichro]

When you wrote the .read part, you already had sample.txt with your text written on it, . Why didn't it write the text under it when you ran it? Does it replace completely the text you wrote before?

[syedmohdsohail]

Thank you so very much Bucky, u really are making life easy for us young developers.
once again, thank you buddy, oh bucky

[vasusabarwalVasu]

When you executed the code with read block in it why didn't the text was again written in the file(Sample.txt) although the write block was also executed??

[sandeepakula]

when you re run the write code does it keep adding those two lines in the sample.txt ! like in first run - lines 1, 2 and again when you run the same now lines 3, 4 and keep adding when re ran ? @Bucky

[GeekySatyam]

Your videos are really awsm I had seen many videos on python thoug they are nice but to be honest boring but urs seems interesting thanks so much