Wek 4 Flashcards
What is a constant?
Fixed values such as number, letters are called constants because these numbers do not change
What do string constant use?
quotes (‘) or double quotes (“)
What is a variable?
is a named place in the memory where a programmer can store data and later receive the data suing the variable “name”
Do programmers get to use choose the names of variables?
Yes, they do.
What are good names for variables?
spam, eggs, spam23, _speed
What are bad names for variables?
23spam, #sign, var.12
Are these distinct variables: spam, Spam, SPAM ?
Yes.
Can you use reserved words as valuables?
No, you cannot.
What is this: x = 2
An assignment statement
How do you call this:
x = x + 2 (Assignment with expression)
Of what does an assignment statement consist?
Can x change its value?
Yes, absolutely
What is the operator for addition?
x
What is the Oprator for subtraction?
-
What is the Operator for multiplication ?
*
What is the Operator for division?
/
What is the operator for power?
**
What is the operator for remainder?
%
What are the operator precedence rules?
- Parenthesis
- Exponentiation
- Multiplication
- Addition
- Left to right
How is integer division in Python?
quite weird
99/100
What will come out in Python?
0
99/100.0
What will come out in Python?
0.99
What happens if you perform an operation and one number is an integert and the other a floating point?
the result is a floating point
What does concatenate mean?
put together
How can you find out the type of sth?
When you put an integer and a floating point into an expression the result will be…
a floating point
print float (99)/100
0.99
Can you concatenate a string and an integer?
No, that is not possible
How do you find out the type of “sval” ?
print type(sval)
What do you use the raw input function for?
In Python, anything after a # is…
ignored
HOw can you multiply Hi fiv e times?
print “Hi” * 5
On what should you base your decision about variables?
On what we want to remember
