Data types, variables, basic input-output operations, basic operators Flashcards
What is a function able to do?
- cause some effect
- evaluate a value and return it as the functions result
What is the function invocation?
The function name along with parentheses and arguments
What happens when python encounters an invocation? e.g. funct_name(argument)
- check if the name if legal
- check if function requirements for arguments allows you to invoke the function in this way
- leaves your code and jumps into function you want to invoke
- executes code, causes desired effect
- returns to your code
Does python allow more than one instruction in a line?
No
How do you create a new line in python?
\n
What is the escape character?
\
What are the two ways of passing arguements?
Positional way and keyword arguments
What are they elements and one rule for the keyword argument?
Elements = keyword, equal sign and value
Rule = have to be put after the last positional argument
What are the two keyword arguments for print?
end and sep
What is a positional argument?
Ones whose meaning is dictated by their position
What is a keyword argument?
Ones whose meaning is not dictated by their location, but by a special word (keyword) used to identify them
What is a literal?
A literal is data whose values are determined by the literal itself.
How are numbers handle by computers?
Integers (no fractional part)
Floating point numbers
What is the numeric type?
The characteristic of the numeric value which determines its kind, range, and application
What is the prefix for octal numbers?
0o (zero - o)
What is the prefix for hexadecimal numbers?
0x (zero - x)
Other than a . what else can make a number a float?
e (exponential)
the exponent (the value after the E) has to be an integer;
the base (the value in front of the E) may be an integer
What are python literals?
Integers
Floats
Strings
Boolean values
What is an operator?
An operator is a symbol of the programming language, which is able to operate on the values.
If you multiply an integer by a float the answer is a …
float
The result produce by a division operator is always …
a float
What does the // operator do?
It is integer division.
it round the integer to the lesser integer value (floor division)
e.g.
6 // 4 = 1
-6 // 4 = -2 (cos -2 is the lesser value closest to -1.5
)
What does the % operator do?
Modulo operator
The result of the operator is a remainder left after the integer division.
14 // 4 gives 3 → this is the integer quotient;
3 * 4 gives 12 → as a result of quotient and divisor multiplication;
14 - 12 gives 2 → this is the remainder.
What are the two type of operator?
Unary and binary
What is operator priority?
1 **
2 +, - (note: unary operators located next to the right of the power operator bind more strongly) (unary)
3 *, /, //, %
4 +, - (binary)
What is operator binding?
Determines the order of computations performed by some operators with equal priority, put side by side in one expression.
** right sided binding
// left sided binding
What is operator binding?
Determines the order of computations performed by some operators with equal priority, put side by side in one expression.
** right sided binding
// left sided binding
What does a python variable have?
A name and a value
What can’t you name a variable or functions?
a number
a reserved keyword
must not have spaces
What is the equal sign?
An assignment operator
How can this be rewritten?
variable = variable op expression
variable op= expression
What is a remark that is omitted at run time?
a comment
Name two functions of python comments
- make code easier to understand
- disable pieces of code that aren’t currently needed
What does the input function do?
The input() function is able to read data entered by the user and to return the same data to the running program.
What is a deaf program?
A program which doesn’t get a user’s input
What two operators can be used on strings?
+ and *
What do you have to be careful with the input function?
If the input is not converted to float or int it is STRING
x = input(4)
y=input(6)
print(x+6)
‘46’
