If you are a lazy mathematician, this interpreter will help you

There are 4 main commands for this language:

1. Print
2. Direct quantification
3. Computing
4. End

If the variable name comes in the input alone, its value is calculated with exactly 3 decimal places. And if there is no such variable, the

variable not found

is printed.

The value to the right of the symbol :=, which may be a number or another variable, is dropped in the variable to the left of this symbol. If the name of a variable that did not already exist is printed on the right, a

variable error

is printed, and if the right numeric expression (val) is not correctly displayed,

val is not a number

is printed.

• An incorrect form for a numerical expression means that the expression starts with a number but has letters in it. For example

3.6d

If the input is a := function(b, c), it is a calculation operation. If the function name is not written in the supported functions

function not found

is printed. And for each of b and c, which are function arguments, a

variable error

is printed if the variable is not defined, and a

val is not a number

is printed if it does not have a correct numeric shape (and is assumed to be val).

If the input is at the end, the program ends.

• The distance around the operator =: and the arguments of the function do not matter.
• Commands 2 and 3 can be used to define a variable.
• The variable name contains only letters and underscores (_).

Functions supported

• add: Add your two arguments.
• sub: Subtracts the second argument from the first.
• mul: Multiplies two arguments.
• div: Divides the first argument by the second.
• pow: Bring the first argument to the second power (available in the math library)
• gcd: Returns the largest common denominator (available in the math library, and make sure that the inputs to this function are integers.)
• log: The logarithm of the first argument is calculated based on the second argument (available in the math library)

Example

Sample input:

a := 3.144
a
a := add(a,4)
a
b := sub(a,3)
b
b := gcd(b,3)
b
b := log(e,f)
end

Sample output:

3.144
7.144
4.144
1.000
variable error

• code.py -> Use regex
• code2.py -> Use AST