Python Tutorial 14: Saving and Reading Data Files With Pickle
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- Опубликовано: 25 май 2021
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In this video we show step-by-step instructions on how to us Pickle in Python to save and read data files. I do not assume you are an expert, so these lessons are designed for complete beginners.
#Python
#Lessons
#Programming 
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I started learning programming eight months ago since I started studying to be an engineer, before then i knew nothing about programming whatsoever and it's one my drawbacks.
I was worried it would be too hard to learn, but your videos help me A LOT, and I'm currently watching the Arduino tutorials.
Learning a lot from you, thank you so much
When there will be new Arduino lessons? , or video(s): like - "How to built drone on Arduino"?. Thanks for your lessons. Thanks for teaching us programming languages. My future work= Programmer.
"We are going to dump nuts" made me have to pause the video 😂. I'm just glad I didn't disrupt the rest of the class. Top lessons as always. Thanks Paul
I am legend! Discovered your set of Python tutorials yesterday and I'm already up to lesson 14. I started commercial programming in COBOL in 1975, a very different world. Any current sbc could eat those 'mainframe' monsters for breakfast in terms of processing power, memory and storage. Amazes me what we could do on a computer with 256KB memory and 240MB of hard disk. Many platforms and programming languages / environments since. I'll be buying the Arduino kit soon and will be looking at your Arduino tutorials even though the pure electronics side of it will be a mystery to me. Haven't looked at electrical theory since senior high school days, (but I did win the senior physics prize for that year so there's some hope for me yet!).
Boom!!! I can't believe it I am legend! All thanks to our great teacher Paul McWhorter!
Legend!
I am legend. I had to go back to lesson 3 to figure out how to address an 2-dimensional array. Very interesting lesson.
Enjoyed the lesson. I had not known of Pickle, been using the open, 'w', 'r' and close. This simplifies the work. I hate that about your arrest, especially since it was the previous owner who had those but at least that's behind you. Stay safe and enjoy whatever comes your way.
I am legend.... (and I am John Galt!). I've been programming for 45 years, and this is my first exposure to Python. I've also worked through your Arduino courses. Using that class, I'm replacing a blown stepper motor controller on a older telescope with a Nano. Very cool stuff.
Hey Paul. I'm really enjoying this series. I am in awe of your teaching style and have learnt a lot form your excellent skills. I previously worked through quite a bit of your Arduino classes. Now looking into Python and slowly getting there. Just completed the homework for this session. Had all the right ideas but lacking in the syntax memory department!
Looking through my previous work helps. Even discovered how to embed a variable in an input function 🙂
I'll follow this series through to it's conclusion. Thanks for all you do
Hi Paul... another excellent lesson.... I didn't do the homework... sorry... but.. I DID apply what I learned here to debug my headless GPS project by pickling the data and saving it to the SD Card .. .and then writing another little program to READ and display the data after a test drive . This helped me "see" what my GPS program was reading and processing... and I was then able to debug and complete the project. I have decided to head on back to the RPi 4 projects / lessons.... ( for now ) ... Thanks again, Paul... God bless you, Brother.
I have enjoyed your lesson and thankful that I came across it. I have been using a python book but came across a section where they don't explain it too well, so I went online and I found you. Thanks for giving clear instructions. I will start looking at your tutorials and also donating money
Mandatory legend. To give myself a bit of freedom with student data, I created a student class. For writing and reading I used json. I had to convert the classes to dicts when writing, but luckily you can just apply var() to them before adding to the array. It was a bit of pain to find the var() solution, but that was actually the hardest part!
Love the lessons. Keep up the great work!
pickle is something my students really need to embrace so they'll be watching your fantastic lesson. Thanks Paul!
Thankyou sir for your lesson, I am proud of myself I solved pickle homework and this was the first ever homework i solved on my own. Thankyou sir I AM LEGEND may god bless you.
All the best
I finally got it. Used all the stuff taught plus my brain to get it done. I learned a lot. Thank very much.
I AM LEGEND!!!, this was really a fun lesson. I did my homework on my own. I'm used to working with datasets so this was pretty simple for me to map out my file. Thank you for showing this and I look forward to seeing your solution next week.
I am legend! Took a short while to figure it out but thanks to your most excellent teaching of past topics it turned out to be easier than I thought!
Took me around 5 hours and some back and forth with a fellow classmate, but we finally figured out a couple ways of doing it!!! The way I did it was by saving all the info in separate arrays then bunching up that info into a single array which was then pickled. That way I could say how many grades there were, the names, and the grades. After that, on the second program I just used a for loop to match the user's input to one of the names.
We regret to inform you that there is no room available for folding lawn furniture as the designated space is currently filled to capacity with LEGEND!
Most Excellent!
😂👍
To coin your phrase: BOOM I am Legend. Very enjoyable lesson and Homework, had to review this video a few times to get the syntax right but got it working using a counter in my while loop for the number of entries instead of asking how many they want to enter.
Another Most Excellent lesson!
I am Legend. I just written down the Homework you said as steps like
program one:
1. ask how many student you have?
2.Then ask for: student name and his average
3. Then pickle the data
program two:
1.Ask which student are you interested in?
2.Get data from pickle file
3.Then show up his grade
Really writing things to do helps a lot. Again, Thanks a lot. Great teaching. I am getting addicted to your videos.
Love your explanation,easy to understand for beginner.
Pretty neat app Pickle. We'll see after new years how easy the homework is.
I AM LEGEND, Thanks for the great tutorials, it is by far the best I have ever done!
Dear Paul, thanks to your lesosns, I could do this homework. Kind greetings.
We are ready for more learning!
I AM LEGEND! So proud of myself because I was having a problems because of one misplaced parentheses.
Great tips.. Thank you very much!
I am Legend! Your lessons are very easy to understand. Thank you.
Glad to hear that!
Sir we are so excited to listen your lessons I'm in class 12 a bio student but I learnt Arduino tutorials now I'm sticking to learn python. Thank you so much sir
I am also
Keep it up
@@paulmcwhorter Thank you sir
I AM LEGEND! Thank you Paul. When you finish your VPython series and OpenCV series, could you please do some lessons on C++. Thank you again for these great lessons.
Ayyyyyyy it’s the man that taught me how to program an arduino uno r3
I am legend! I finally got around to having a go at one of the homework assignments instead of just watching and learned a lot. Thanks.
Fantastic!
I AM LEGEND! Thank you so much Paul for these incredible videos. I am currently doing an engineering apprenticeship and hoping that learning Python will set me up for new languages and a wider career plan in the future! You are the real legend here!!
Fantastic! Also if you have not already watch my series on how to be a successful engineer, will cover every thing you need to know to land that dream job.
@@paulmcwhorter I will start to watch them today, looking forward to learning more skills and gaining knowledge!
Got her working both programs. It was a bit of a challenge but really enjoyed these two programs. Let's keep having fun.
Great to hear! Thanks for the comment, Opal
Python is amazing. The more I delve into the online docs to get the HW assignments done, the more I discover how powerful this programming language is. I'm really looking forward to the next series about using Python with Arduino even though I no longer have the room for my workbench and had to pack my micro-controller lab away into boxes, I'll find a way to setup a small work area somewhere. Thanks for the tutorials. I'll head over to Patreon and do what I can.
Here is a streamlined version of the bubble sort from the last assignment using one of the powerful features of the language (note the swap):
i=0
while (i < numGrades - 1):
if(grades[i] < grades[i + 1]):
grades[i], grades[i + 1] = grades[i + 1], grades[i]
i += 1 * (i == 0) + -1 * (i > 0)
else:
i += 1
I do indeed love python.
Thanks paul, I'm a legend. All bcoz of you
Another Interesting Lesson
thank you for your lesson
Apparently you're a Legend of an instructor because I Am Legend ... at least for this lession!😉 Completed assignment less than 9- minutes.
LEGEND!
I am legend! Once I finished it became quite obvious how simple it actually was to accomplish.
Another Most Excellent lesson! :)
Glad you think so!
Legend. Great lesson.
LEGEND!
thank you soo much for the lesson,
still waiting for more Arduino tutorials
more love from martin UG
A question, could you teach open() and close() commands in python as well, for use with basic notepad files?
I went a bit ahead with self learning and made an automated high-score table with them, but took me way too long and i'm wondering if there is a simpler way of doing it without libraries.
Learn a lot from you. Thank u sir.
My pleasure
I am legend! Even made the second module to validate the entered name and if it's not existent or mistyped - reports that "No student with this name has been found!" Ah...something comes to mind with this lesson: I hope in some late lesson we get to explore what these 'wb' and 'rb' strings meaning is. Anyway - great lessons, kuddos to you Paul!
Hello georgi, i tried the same, but when i type the non-existing name, it reports 'error... student not found' 8 times (No. of students are 8), maybe it's because of for loop, or idk, can you tell me how to fix that, thanks.
I'm legend, really enjoying the course
yes sir, I am a legend, thanks to you
Paul i love u sm sir from morocco ❤️
I'm back after a summer hiatus in the mountains. Don't worry, I kept the Patreon flowing.
Thanks! Really appreciate the help on Patreon.
Hello! I'm a huge fan, and I have a suggestion!
Could we get a video on Arduino communicating wirelessly with nRF24L01 modules? There are countless applications for them and I can't find someone that could explain it as amazing as you do!
Thanks alot sir love it alot
Thanks for liking
Hi Paul! I am wondering what DC barrel socket you recommend for Arduino. I’m trying to power my arduino nano. I want something small.
I got it :) thank you boss!
Great!
Hello Paul, a bit unrelated but how'd the hydroponically-grown plants fared since you first showed us your greenhouse in 2019?
Thank you Sir, another great lesson! Your lessons are not wasted time (#NWT) for me and that is exactly what I want! 👍
Glad to hear it!
On my 14th cup of coffee, no sugar, no sweetener today and I am about to program God in Python
I propose to have a tutorial on VSC debugger
Watched this since the AI lesson 17's homework requires writing data to the disk and I have not watched the python series :P!
Did homework ok thank you.
LEGEND!
please sir, I didn't understood what you meant by the wright binary(wb) and the other. please help me with that or anyone can help as well.
Cool video though I haven't had much time lately .I have played around with python a little .its fun . My robot has three raspberry pi on it so I should be watching more of these.😁👍🤖🛸🛸
Sounds great!
Greetings to you Sir Paul, when are looking forward for our next lesson on "Robotics" , and we also need a new lesson on Raspberry pi
I am a LEGEND!
Yes you are!
Can any one help me with this program, I copied the code directly but every time I try to run it it tells me I can’t reference a list in the range. If anyone has had this problem I would really appreciate some help.
Pee cans? Pickle dumps? This series has taken a strange turn
Serious question: Is it possible to get a job like programing or robotics if your source of education is through RUclips and the internet?
Go into the interview with a heck of a project you have built. Something that shows you can do hardware and software. Show them what you can do and you have a shot.
I am legend!!! 💪
I got it. Guess "I am legend". I used some of the tricks like printing intermediate steps and I went a step further to "error check" the second program in case someone enters a student name not in the list. It gives you a error message and then asks for a new name.
Sorry Paul but in your open(....) lines you introduce the term "wb" and "rb", which I understand stands for; write binary and read binary. Maybe I missed where you told us where they come from. Are they standard terms used in Python and do not need any definition. Could you expand on them a little?
Similarly the "dt" in line 12 "for dt in bigKahuna:" where was "dt" defined??
Many Thanks, I am enjoying the course.
I believe "wb" and "rb" to be standard in python.
As for "dt" in bigKahuna 🤔
It appears to be an empty variable.
It must update itself with each element of the bigKahuna array, while simultaneously counting which index of the array it is on, (as it continues only for the number of elements in the array).
I'm guessing this is a pre-existing feature of variables, in for loops, in python.
Good stuff though hey 👍 😃
@@bigbogeyface great
I am legend, this seem harder than Fortran was a long, long time ago.
I, sir, am legend.
I Am Legend!
As someone who only started python recently and watched all your other vids I think you went a bit fast with this one
I am legend.
I'm legend, this was a tough one But I did it
I don’t understand the reason you dump to f, then read in at f2.
I am legend :)
I Am Legend.
I am legend
I am also 12 student science student
I am Legend!
LEGEND!
Is it just me or is everyone here is looking forward to doing homework!!
Hey pls help me I am getting this error even though I copied whole code same
PS D:\mann\py> & C:/Users/mann/AppData/Local/Programs/P ython/Python310-32/python.exe d:/mann/py/pickle.py
Traceback (most recent call last):
File "d: \mann\py\pickle.py", line 2, in import pickle
File "d: \mann\py\pickle.py", line 9, in pickle.dump(fruits, f)
AttributeError: partially initialized module 'pickle' h as no attribute 'dump' (most likely due to a circular i mport)
If you re-watch the video Paul cautions NOT to name your file "pickle.py" or it can cause problems. Name it "myPickle.py" instead.
I'm 2nd
I have done two files as you requested and I got everything working in the way you wanted. However, in the second file I had to use len(a) to make it work. I don't think you have covered len so I guess you will do it differently. Also, I had to add a 'break' in my for command to print a final line 'Name does not exist'. Everything works fine but looking forward to your solution.
I am a eighth grade student
I'm first 🤣
Thanks. The intro where you talked a little bit slower - was the best. Now it is a little bit fast.
Because this intro is essential for all videos. I adore this phrase about coffee and jet fighters)
Noted!
I'm a legend
LEGEND!
I am lawnchair and I love pickels
am a legend.
LEGEND!
I am Legend 😊
LEGEND!
Why didn’t you teach Jason instead of pickle
I folded yet again.
Dont get discouraged. It is called learning. Over time you will begin to find more success, and the harder it is to get there the more satisfying it will be when you succeed. Just dont giver up.
can i call you grandpa
Yes you may.
Sorry but I folded up like a cheap walmart lawn chair
i had problems with working dir
i found this solution
import os
os.chdir(os.path.dirname(os.path.abspath(__file__)))
i changes work dir to file's dir
works good.