Alina Layeuskaya

final_task/config.py

@@ -0,0 +1,50 @@
+import math
+import operator
+import string
+
+LETTERS = tuple(string.ascii_lowercase + string.ascii_uppercase)
+DIGITS = tuple(string.digits)
+
+UNARY_OPERATORS = {'+': (1, operator.add),
+                   '-': (1, operator.sub),
+                   }
+
+BINARY_OPERATORS = {'*': (2, operator.mul),
+                    '/': (2, operator.truediv),
+                    '//': (2, operator.floordiv),
+                    '%': (2, operator.imod),
+                    '^': (3, operator.ipow),
+                    '<': (0, operator.lt),
+                    '<=': (0, operator.le),
+                    '>': (0, operator.gt),
+                    '>=': (0, operator.ge),
+                    '==': (0, operator.eq),
+                    '!=': (0, operator.ne),
+                    }
+
+OPERATORS = UNARY_OPERATORS.copy()
+OPERATORS.update(BINARY_OPERATORS)
+
+PARENTHESES = ('(', ')')
+
+OPERATORS_BEGIN = ('+', '-', '*', '/', '%', '^', '<', '>', '=', '!',)
+
+DOUBLE_OPER_PART1 = ('/', '<', '>', '=', '!',)
+DOUBLE_OPER_PART2 = ('/', '=',)
+
+BUILT_IN_FUNCTIONS = ('abs', 'round')
+NOT_SUPPORTED_MATH_FUNCTIONS = ('frexp', 'isclose', 'isinf', 'isfinite', 'isnan')
+MATH_CONSTS = ('e', 'pi', 'inf', 'nan', 'tau')
+MATH_FUNCTIONS = tuple([func for func in dir(math) if not func.startswith('_') and
+                        func not in (MATH_CONSTS + NOT_SUPPORTED_MATH_FUNCTIONS)])
+
+ALL_FUNCTIONS = BUILT_IN_FUNCTIONS + MATH_FUNCTIONS
+ALL_FUNCTIONS_AND_CONSTS = ALL_FUNCTIONS + MATH_CONSTS
+
+ALL_FUNCTIONS_DICT = {el: (4,) for el in ALL_FUNCTIONS}
+ALL_FUNCTIONS_AND_OPERATORS_DICT = ALL_FUNCTIONS_DICT.copy()
+ALL_FUNCTIONS_AND_OPERATORS_DICT.update(OPERATORS)
+
+
+DELIMETERS = ('.', ',', ' ')
+ALLOWED_TOKENS = OPERATORS_BEGIN + LETTERS + DIGITS + PARENTHESES + DELIMETERS

final_task/pycalc.py

@@ -0,0 +1,25 @@
+import argparse
+from sys import argv
+
+from pycalc_proc import PyCalcProcessing
+
+
+def create_parser():
+    parser_ = argparse.ArgumentParser(prog='Py Calc',
+                                      description='Pure-python command-line calculator',
+                                      epilog='(c) Alina Laevskaya 2019.'
+                                      )
+
+    parser_.add_argument('EXPRESSION', type=str, help='String formula for processing.')
+    return parser_
+
+
+def main():
+    parser = create_parser()
+    namespace = parser.parse_args(argv[1:])
+    py_calc_obj = PyCalcProcessing(namespace.EXPRESSION)
+    py_calc_obj.launch_processing()
+
+
+if __name__ == '__main__':
+    main()