Python: Objects | CompuGinger

Talk = ''

def create_greeting(greeting=None):
    global Talk
    Talk = greeting + ' fellow blogsters! '
    return Talk

create_greeting('Hello')
Talk += 'How are we doing today?'

def create_sign(greeting, decoration = "*"):
    line = decoration * len(greeting) # len(STRING) gets the length of a string
    print(line)
    print(greeting)
    print(line)

create_sign(Talk)

Objects

You can make functions by
- ```
def FUNCTIONAME(PARAM)
```
Named references should be thought of as objects rather than variables
- Assignment attaches a name to the object
- Changing assignment from one reference to another puts two different names referring to the same object
- The is operator determines if references are the same object
  - ```
  List1 = [1,2,3]
  List2 = List1
  print(List1 is List2) # prints True
```
Python garbage collector reclaims unreachable objects
Function arguments can be specified with defaults
The default expressions are evaluated once when def is executed for the first time
Global references can be read from a local scope but only when you specify
- ```
global VARIABLE_NAME
```