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Programming in python - Week 2
- 1. Programming in Python Week-2Content
- 2. Blocks in Python ●Grouping of sentences for a specific purpose ● Piece of python program that is executed as a unit ● Can be called once or more ● Can invoke other code blocks ● Indentation used to denote block ● All statements with same indentation level - form one block ● If blocks have to be nested, indent further
- 3. Scope of Variables ●Defines visibility of a name within a block ● A variable is only available from inside the region it is created. This is called scope. ● Same variable name inside and outside of a function, Python will treat them as two separate variables.
- 4. Local vs Globalvariables ● Scope of global variables - for the entire program ● Scope of local variables - only in the function it is defined ● global keyword is used to assign/change variables inside functions
- 6. Comments ● Comments forincreasing understandability of code - for yourself & others ● Types of Comments in Python ○ Single-Line ○ Multi-Line
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- 10. Python Datatypes -int & float ● int (signed integers) − They are often called just integers or ints, are positive or negative whole numbers with no decimal point. ● float (floating point real values) − Also called floats, they represent real numbers and are written with a decimal point dividing the integer and fractional parts. ● Can use type() to get the datatype of a variable/value
- 11. Python Datatypes -Boolean ● Represented by 2 values: True and False ● These values are case-sensitive
- 12. Basic Operators ● Arithmetic ●Comparison/ Relational ● Assignment ● Logical
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- 18. Logical AND operator- and
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- 20. Logical NOT operator- not
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- 22. Strings & Accessingcharacters
- 23. What are keywords? ●Reserved words in Python ● Cannot use a keyword as a variable name, function name ● Keywords are case-sensitive ● If you try to use them as variables, you will end up with SyntaxError ● This can be used to get the keyword help("keywords")
- 24. Creating functions inPython Starting a for-loop
- 25. global keyword ● Usedif you want to make a change to the global variable inside a function. ● If you want to create a global variable from inside a function.
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Editor's Notes
- #3 All the lines will be executed one after the other when a block is invoked. Grouping related code makes it easier to understand