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- 1. Basic Python (Part 1) CSC1105 PROGRAMMING WITH PYTHON
- 2. Learning objectives At the end of this chapter, student should be able to: 1. Identify the syntax and variable in python
- 3. Introduction to Python CSC1105 PROGRAMMING WITH PYTHON
- 5. What can Python do? used on a server to create web applications can also read and modify files. can be used to handle big data and perform complex mathematics.
- 6. Python Syntax compared to other programming languages Python was designed for readability and has some similarities to the English language with influence from mathematics. Python uses new lines to complete a command, as opposed to other programming languages which often use semicolons or parentheses. Python relies on indentation, using whitespace, to define scope; such as the scope of loops, functions and classes. Other programming languages often use curly-brackets for this purpose.
- 7. Syntax CSC1105 PROGRAMMING WITH PYTHON
- 8. What is syntax? Syntax refers to the rules and structure that define how to write code in a specific language.
- 9. Python Indentation Indentation refers to the spaces at the beginning of a code line. Where in other programming languages the indentation in code is for readability only, the indentation in Python is very important. Python uses indentation to indicate a block of code.
- 10. Python Indentation The number of spaces is up to you as a programmer, the most common use is four, but it has to be at least one. You have to use the same number of spaces in the same block of code, otherwise Python will give you an error:
- 11. Comments CSC1105 PROGRAMMING WITH PYTHON
- 12. Why need to use comment? explain Python code. make the code more readable. prevent execution when testing code.
- 13. Creating a comment Comments starts with a #, and Python will ignore them Comments can be placed at the end of a line, and Python will ignore the rest of the line A comment does not have to be text that explains the code, it can also be used to prevent Python from executing code
- 14. Multiline comments Python does not really have a syntax for multiline comments. To add a multiline comment, you could insert a # for each line: add a multiline string (triple quotes)
- 15. Variables CSC1105 PROGRAMMING WITH PYTHON
- 17. Creating Variables Python has no command for declaring a variable. A variable is created the moment you first assign a value to it. Variables do not need to be declared with any particular type, and can even change type after they have been set.
- 18. Casting If you want to specify the data type of a variable, this can be done with casting.
- 19. Get the type You can get the data type of a variable with the type() function.
- 20. Variable Names 1. A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). Rules for Python variables: 2. A variable name must start with a letter or the underscore character 3. A variable name cannot start with a number 4. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) 5. Variable names are case-sensitive (age, Age and AGE are three different variables) 6. A variable name cannot be any of the Python keywords.
- 22. Legal VS Illegal variable names LEGAL ILLEGAL
- 23. Multi words variable Names
- 24. Multi words variable Names
- 25. Multi words variable Names
- 26. Assign Multiple Values MANY VALUES TO MULTIPLE VARIABLES ONE VALUE TO MULTIPLE VARIABLES
- 28. Output Variables SIMPLE MULTIPLE VARIABLES
- 29. Output Variables + OPERATOR NUMBER WITH + OPERATOR
- 30. Output Variables + OPERATOR COMBINE STRING AND NUMBER TRUE OR FALSE? COMMA COMBINE STRING AND NUMBER TRUE OR FALSE?
- 31. Conclusions What have you learned today?