Python PCEP Variables
- 1. Module 1 operations, basic operators,data types, variables, basic input-output Variables
- 2. Module 1 Variables What are variables? Variable name be composed of uppercase or lowercase letters, digits, and the character _ begin with a letter; the underscore character is a letter; upper- and lower- case letters are treated as different; not be any of Python's reserved words.
- 3. Module 1 Variables Correct & incorrect variable names Correct, but not always convenient: Incorrect MyVariable i t34 Exchange_Rate days_to_christmas TheNameIsSoLongThatYouWillMakeMistakesWithIt 10t Exchange Rate
- 4. Module 1 Variables Keywords neither for your variables nor functions Keyword s 'False', 'None', 'True', 'and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield'
- 5. Module 1 Variables Creating variables use the name of the desired variable the equal sign (=) the value var = 1 account_balance = 1000.0 client_name = 'John Doe' print(var, account_balance, client_name) print(var) 1 1000.0 John Doe 1
- 6. Module 1 Variables Assigning a new value to an already existing variable var = 1 print(var) var = var + 1 print(var) 1 2 var = 100 var = 200 + 300 print(var) 500 a = 3.0 b = 4.0 c = (a ** 2 + b ** 2) ** 0.5 print("c =", c) c = 5.0
- 7. Module 1 Variables Shortcut operators x *= 2 • x = x * 2 sheep += 1 • sheep = sheep + 1 variable op= expression • variable = variable op expression
- 8. Module 1 Variables Key takeaways 1 • A variable is a named location reserved to store values in the memory 2 • Each variable must have a unique name - an identifier 3 • Python is a dynamically-typed language 4 • Using compound assignment operators 5 • Assigning new values to already existing variables 6 • Combining text and variables using the + operator
- 9. Module 1 Variables LAB Practice 4. Variables 5. Variables: a simple converter 6. Operators and expressions