RPN

Reverse Polish Notation calculator for Python.

Binary Operators

• +: addition
• -: subtraction
• *: multiplication
• /: true division
• %: modulo
• //: floor division
• **: exponentation

Unary Operators

• abs: absolute value
• sqrt: square root
• ceil: rounding up
• floor: rounding down

Examples

::

import decimal

import rpn result = rpn.solve_rpn('3.4 -3 abs + 100 sqrt -') print(result) # 3.6

try:

rpn.solve_rpn('3 3 3 +') rpn.solve_rpn('3 +') rpn.solve_rpn('abs') rpn.solve_rpn('3 a +')

except RPNError:

...

try:

rpn.solve_rpn('0 5 /')

except decimal.DivisionByZero:

...

try:

rpn.solve_rpn('-5 sqrt')

except decimal.InvalidOperation:

...

try:

rpn.solve_rpn('9999999999999 9999999999999 **')

except decimal.Overflow:

...

CLI Usage

::

$ rpn "1 2 + 8 -" $ 5