10.Python Notes

0. Study Questions

• What is Python? Python is a programming language
• Machine Language(0 and 1)

• A programming language connects human language and machine language

• How Does Python Works?

• Python uses libary with code already in it (this makes programing easier)

• After you type code into Python, Python interprator traslates it into machine language. The machine language then comands the machine to operate the task.

• How is VSCode and Python Related?

• VSCode is the most poplular computer language IDE (Integrated Development Environment)
• IDE provides a lot of supporting features in terms of coding, e.g. versioning control, debugging.
• VSCode supports Python very well, it is the second most popular Python IDE, after PyCharm.

Python: Programming: A Beginners Guide to Learn Python in 7 Day

Introduction

• This book will only teach the basics
• Python is the easiest language to learn
• This makes it a great way to start coding
• This will help you move on to more complicated languages
• Python has a great framework and community to help you
• Python is used for a lot of different reasons
• This makes it great for all sorts of people

1: Setting Up Your Environment

• How to set up python for Windows 7, 8, 8.1, and 10
• Download Python
• Run the Python Installer
• Under heading Advanced Options choose where you want python to be installed
• Set up the PATH varible for systems
• Open Control Panel
• Go to Envirment>System Environment Variable>Edit>Environment Varibles
• Under User Varibler:
  • edit a path
  • make new path
• click on Start>Windows System>Command Prompt : then type following listed in book
  • This will load Python Interpreter
• type exit and press enter return back to command prompt
• Text Editors You need test editor to program
• Widows
  • notepad
• Mac
  • Text Wrangler
• After, save your frist program (something e.g. Firstprog).py

2: Let's Get Programming

• Math
• Type formula in pythong command line, you get result on screen start with: sum=x+y print("sum equals",sum)

3: Varibles and Programs in Files

4: Loops, Loops and More Loops

5: Functions

6: Dictionaries, Lists and Tuples

7: The "for" Loop

8: Classes

9: Modules

10: File Input/Output

11: Error Handling

Conclusion

Addition with Python

To print words: print("word")

Command	Name	Example	Output
+	Addition	5+7	12
-	Subtraction	7-5	2
*	Multiplication	5*7	35
/	Division	12/3	4
%	Remainder	19%3	1
**	Exponent	2**4	16

start with: sum=x+y print("sum equals",sum)

Varibles

Varibles is where you assign a value to it. E.g. v=1 You can use this in problems. Instead of putting the numbers, add the varibles. E.g.: x=1 y=2 sum=x+y print("sum is:",sum)

Programs in Files

1. Write text in another app like notebook like writing python.
2. Move it into a folder and rename with a .py.
3. Go back to python.
4. Press file and open the file.
5. Play code

Loops

while loop: a=0 while a < 10: a=a+1 print (a) answer: 1 2 3 4 5 6 7 8 9 10

use if for condition

if[donditions to be met]: {do this} {and this} {and this} {but this happens regardless} {because it isnt indented}

y=1 if y == 1: print("y still equals 1, i was just checking")

print ("we are going to show the even numbers up to 20") n=1 while n <= 20: if n % 2 == 0: print(n) n=n+1 print ("there, it's done")

Expression	Function
<	Less than
>=	Less than or equal to
>	Greater than
>=	Greater than or equal to
!=	not equal to
<>	alternative expression for not equal to
==	equal to

if{conditionss}: {run this code} elif{conditions}: {run this code} elif{conditions}: {run this code} else: {run this code}

Simple Calculator Code

Funtions

def function_name(parameter_1,parameter_2) {this is the code that is in the function} {more code} {more code} return{value(e.g. text or number)to return to the main program}