Week 2 Flashcards
What is the name of the internal representation of literals used by an executed python program?
Objects OR Values
What are operators and operands?
Operators are functions that complete acts of computations.
Operands are the objects that are worked on by operators
What is a function call?
This is when we invoke a function in the form X(x)
X = name of function x = inputs
What is the name of the output of a function?
Output OR Return Value
What do pearentheses do?
They invoke functions.
Are functions objects?
YES
Invoked by ()
Are functions objects?
YES
Invoked by ()
Can you concatenate a string and integer?
Yes, only if you first convert the integer into a string.
Otherwise, no.
Can you concatenate a string and integer?
Yes, only if you first convert the integer into a string.
Otherwise, no.
What are the main data types?
Int = integers Floats = decimals Str = strings
What is a variable?
A variable just refers to an object/value
What are assignment statements?
These are statements using ‘=’ to attach one object to another thus creating new variables.
Can variables contain spaces?
NO
use underscores if needed
Are variables case sensitive?
YES
Can variables start with a number?
NO
Can variables contain characters other than letters and numbers?
NO (for the most part)
Why is “class” an illegal name for a variable in python?
This is a python keyword
What is a statement?
It is an instruction that the python interpreter can execute
What is an expression?
This is a combination of literals, variable names, operators and calls to functions
What is the term which refers to when python interpreters checks prior to execution?
Evaluation
What determines the order of evaluation of an expression?
The rules of precedence.
What are the rules of precedence?
- (Parentheses) have highest precedence
- Exponentiation
- Multiplication and Division, then Addition and subtraction
- Operators with same precedence read from left to right
Is it possible to reassign a variable?
YES
What is the term for when a variable first evaluated?
Initialisation
