comp 110 concepts

return statement required?

NO

functions do not need a return statement

where does a function go?

back to where it was called to see if there is more code to evaluate

return replaced with print?

a return statement cannot be replaced with a print statement

print after return

will raise an error because print references unreachable code

functions defined after reference in another?

if the main function is called after the other functions are defined, it is fine to enter because they are defined already

relative reassignment operator

only one =

not two ==: means that elements are equal to each other

changes are global

if a value is passed to a function and then modified, those changes are reflected globally

manipulation of object

the function does not copy the object

instead, it directly manipulates the original object

for loops

CANNOT print indexes

can print indexes with a while loop and for ... in range loop

be careful with variables - sometimes python will mess up with local and global variables

unit tests

do not forget the return type

modifying a key in a dict

update to the new key with the correct value

remove the old key with the pop method

init return

returns a reference number to the heap

doesn't take self as an argument but always has it as a parameter

self.attribute, SELF.ATTRIBUTE

methods in a class

when you define a method in a class, all objects of that class have that method associated with it

constructor calling

you don't have to have an instance of a class to call the class's constructor