Python Workshop Day - 2 (REVA University)

Python Workshop Reva University - Files, Classes & Objects, CLI Applications

Transcript

1. Python Workshop Day 2 REVA Institutions @dhilipsiva
2. Requirements pip install xlsxwriter pydub pillow moviepy requests click
3. Tech Lead, Full-Stack & DevOps - @Appknox I code for Web, Mobile, Embedded & IoT. Open- Source Fanatic. Big Data & Machine Learning Enthusiast. Dad. Atheist So primarily a Developer + little bit of this & that Jack of all trades & Master of none No, I do not keep Bindi for religious reasons. Its for a scienti c reason & a fashion statement. http://dhilipsiva.com dhilipsiva@gmail.com
4. I have no idea what I am talking about
5. How else can I help you? Dropout (Yes, I am not a graduate) Startup Fanatic (& hate corporate) Full Stack & DevOps landscape Getting Started on ML I love Python. A lot. Take my words with a pinch of salt
6. Recap: Workshop Day 1 None, Boolean, Numbers, Strings, List, Tuple, Set, Dict, Variables, List & String Manipulation, Conditionals, Loops, Function More: https://github.com/ChillarAnand/python- 101/blob/master/manuscript.md
7. Overview: Workshop Day 2 Files (Text, Excel, Audio, Image, Video) Classes & Objects CLI Application (Let's build a simple game)
8. Files fr = open("file.txt") # Open a file to read fr.read() # Will read entire content fr.readline() # Reads line by line fr.readlines() # Reads the entire files and return a list fr.close() # Close the file fw = open("file.txt", "w") # Open a file to write fw.write("Foo Bar") # Write a single line fw.writelines(["One", "Two"]) # Write a list of lines fw.close() # Close the file # Also explain append mode
9. Excercises 1. Copy content of one le into another le 2. Remove the lines in a le which has the text foo
10. Excel Sheet import xlsxwriter workbook = xlsxwriter.Workbook('demo.xlsx') worksheet = workbook.add_worksheet() worksheet.set_column('A:A', 20) bold = workbook.add_format({'bold': True}) worksheet.write('A1', 'Hello') worksheet.write('A2', 'World', bold) worksheet.write(2, 0, 123) worksheet.write(3, 0, 123.456) worksheet.insert_image('B5', 'logo.png') workbook.close()
11. Image from PIL import ImageFilter size = (128, 128) from PIL import Image im = Image.open("lena.ppm") print(im.format, im.size, im.mode) im.show() im.thumbnail(size) box = (100, 100, 400, 400) region = im.crop(box) region = region.transpose(Image.ROTATE_180) out = im.resize((128, 128)) out = im.rotate(45) out = im.transpose(Image.FLIP_LEFT_RIGHT) out = im.filter(ImageFilter.DETAIL)
12. Audio from pydub import AudioSegment song = AudioSegment.from_wav("trance.wav") ten_seconds = 10 * 1000 first_10_seconds = song[ten_seconds:ten_seconds*2] last_5_seconds = song[-5000:] beginning = first_10_seconds + 6 end = last_5_seconds - 3 backwards = beginning.reverse() with_style = beginning.append(end, crossfade=1500) with_style = with_style.append(backwards, crossfade=1500) do_it_over = with_style * 2 awesome = do_it_over.fade_in(2000).fade_out(3000) awesome.export("mashup.wav", format="wav")
13. Video from moviepy.editor import VideoFileClip, TextClip, CompositeVid clip = VideoFileClip("baby-cry.webm") clip = clip.volumex(0.8) txt_clip = TextClip("Baby Cry", fontsize=70, color='white') txt_clip = txt_clip.set_pos('center').set_duration(3) video = CompositeVideoClip([clip, txt_clip]) video.write_videofile("baby-cry-text.webm")
14. Classes and Objects Abstraction Polymorphism Encapsulation Inheritance __init__, super, __str__, __len__
15. CLI Applications Lets build a simple game, shall we?
16. Thanks! https://github.com/dhilipsiva/talks This copy is released under the MIT License Source Code SlideShare Link Questions http://dhilipsiva.com