clean directory
This commit is contained in:
lafrite
parent
fbb8951216
commit
1935a44715
409
calculus.py
409
calculus.py
@ -1,409 +0,0 @@
|
||||
#!/usr/bin/env python
|
||||
# encoding: utf-8
|
||||
|
||||
|
||||
from generic import Stack
|
||||
from fraction import Fraction
|
||||
|
||||
def str2tokens(exp):
|
||||
"""Convert an expression into a list of tokens
|
||||
|
||||
:param exp: The expression
|
||||
:returns: the list of tokens
|
||||
|
||||
>>> str2tokens("1 + 2")
|
||||
[1, '+', 2]
|
||||
|
||||
"""
|
||||
tokens = exp.split(" ")
|
||||
|
||||
for (i,t) in enumerate(tokens):
|
||||
try:
|
||||
tokens[i] = int(t)
|
||||
except ValueError:
|
||||
pass
|
||||
|
||||
return tokens
|
||||
|
||||
def infixToPostfix(infixTokens):
|
||||
"""Transform an infix list of tokens into postfix tokens
|
||||
|
||||
:param infixTokens: an infix list of tokens
|
||||
:returns: the corresponding postfix list of tokens
|
||||
|
||||
:Example:
|
||||
|
||||
>>> infixToPostfix([1, "+", 2])
|
||||
[1, 2, '+']
|
||||
|
||||
>>> infixToPostfix([1, "*", 2, "+", 3])
|
||||
[1, 2, '*', 3, '+']
|
||||
"""
|
||||
|
||||
priority = {"*" : 3, "/": 3, "+": 2, "-":2, "(": 1}
|
||||
|
||||
opStack = Stack()
|
||||
postfixList = []
|
||||
|
||||
#infixTokens = infixExp.split(" ")
|
||||
|
||||
for token in infixTokens:
|
||||
if token == "(":
|
||||
opStack.push(token)
|
||||
elif token == ")":
|
||||
topToken = opStack.pop()
|
||||
while topToken != "(":
|
||||
postfixList.append(topToken)
|
||||
topToken = opStack.pop()
|
||||
elif isOperation(token):
|
||||
# On doit ajouter la condition == str sinon python ne veut pas tester l'appartenance à la chaine de caractère.
|
||||
while (not opStack.isEmpty()) and (priority[opStack.peek()] >= priority[token]):
|
||||
postfixList.append(opStack.pop())
|
||||
opStack.push(token)
|
||||
else:
|
||||
postfixList.append(token)
|
||||
|
||||
while not opStack.isEmpty():
|
||||
postfixList.append(opStack.pop())
|
||||
|
||||
return postfixList
|
||||
|
||||
def computePostfix(postfixTokens):
|
||||
"""Compute a postfix list of tokens
|
||||
|
||||
:param postfixTokens: a postfix list of tokens
|
||||
:returns: the result of the calculus
|
||||
|
||||
"""
|
||||
#print(postfixToInfix(postfixExp))
|
||||
# where to save numbers or
|
||||
operandeStack = Stack()
|
||||
|
||||
#tokenList = postfixExp.split(" ")
|
||||
|
||||
for (i,token) in enumerate(postfixTokens):
|
||||
if isOperation(token):
|
||||
op2 = operandeStack.pop()
|
||||
op1 = operandeStack.pop()
|
||||
res = doMath(token, op1, op2)
|
||||
operandeStack.push(res)
|
||||
|
||||
#print("Operation: {op1} {op} {op2}".format(op1 = op1, op = token, op2 = op2))
|
||||
#print(operandeStack)
|
||||
#print(postfixTokens[i+1:])
|
||||
newPostfix = " ".join(operandeStack + postfixTokens[i+1:])
|
||||
#print(postfixToInfix(newPostfix))
|
||||
|
||||
else:
|
||||
operandeStack.push(token)
|
||||
|
||||
return operandeStack.pop()
|
||||
|
||||
def computePostfixBis(postfixTokens):
|
||||
"""Compute a postfix list of tokens like a good student
|
||||
|
||||
:param postfixTokens: a postfix list of tokens
|
||||
:returns: the result of the expression
|
||||
|
||||
"""
|
||||
# where to save numbers or
|
||||
operandeStack = Stack()
|
||||
|
||||
#tokenList = postfixExp.split(" ")
|
||||
tokenList = postfixTokens.copy()
|
||||
|
||||
steps = []
|
||||
|
||||
steps = []
|
||||
|
||||
# On fait le calcul jusqu'à n'avoir plus qu'un élément
|
||||
while len(tokenList) > 1:
|
||||
tmpTokenList = []
|
||||
# on va chercher les motifs du genre A B + pour les calculer
|
||||
while len(tokenList) > 2:
|
||||
if isNumber(tokenList[0]) and isNumber(tokenList[1]) and isOperation(tokenList[2]):
|
||||
# S'il y a une opération à faire
|
||||
op1 = tokenList[0]
|
||||
op2 = tokenList[1]
|
||||
token = tokenList[2]
|
||||
|
||||
res = doMath(token, op1, op2)
|
||||
|
||||
tmpTokenList.append(res)
|
||||
|
||||
# Comme on vient de faire le calcul, on peut détruire aussi les deux prochains termes
|
||||
del tokenList[0:3]
|
||||
else:
|
||||
tmpTokenList.append(tokenList[0])
|
||||
|
||||
del tokenList[0]
|
||||
tmpTokenList += tokenList
|
||||
|
||||
steps += expand_list(tmpTokenList)
|
||||
|
||||
tokenList = steps[-1].copy()
|
||||
|
||||
|
||||
return steps
|
||||
|
||||
def isNumber(exp):
|
||||
"""Check if the expression can be a number
|
||||
|
||||
:param exp: an expression
|
||||
:returns: True if the expression can be a number and false otherwise
|
||||
|
||||
"""
|
||||
return type(exp) == int or type(exp) == Fraction
|
||||
|
||||
def isOperation(exp):
|
||||
"""Check if the expression is an opération in "+-*/"
|
||||
|
||||
:param exp: an expression
|
||||
:returns: boolean
|
||||
|
||||
"""
|
||||
return (type(exp) == str and exp in "+-*/")
|
||||
|
||||
|
||||
def doMath(op, op1, op2):
|
||||
"""Compute "op1 op op2"
|
||||
|
||||
:param op: operator
|
||||
:param op1: first operande
|
||||
:param op2: second operande
|
||||
:returns: string representing the result
|
||||
|
||||
"""
|
||||
operations = {"+": "__add__", "-": "__sub__", "*": "__mul__"}
|
||||
if op == "/":
|
||||
ans = [Fraction(op1, op2)]
|
||||
ans += ans[0].simplify()
|
||||
return ans
|
||||
else:
|
||||
return getattr(op1,operations[op])(op2)
|
||||
|
||||
|
||||
|
||||
def postfixToInfix(postfixTokens):
|
||||
"""Transforms postfix list of tokens into infix string
|
||||
|
||||
:param postfixTokens: a postfix list of tokens
|
||||
:returns: the corresponding infix string
|
||||
|
||||
"""
|
||||
operandeStack = Stack()
|
||||
|
||||
#print(postfixTokens)
|
||||
|
||||
#tokenList = postfixExp.split(" ")
|
||||
|
||||
for (i,token) in enumerate(postfixTokens):
|
||||
if isOperation(token):
|
||||
op2 = operandeStack.pop()
|
||||
if needPar(op2, token, "after"):
|
||||
op2 = "( " + str(op2) + " )"
|
||||
op1 = operandeStack.pop()
|
||||
if needPar(op1, token, "before"):
|
||||
op1 = "( " + str(op1) + " )"
|
||||
res = "{op1} {op} {op2}".format(op1 = op1, op = token, op2 = op2)
|
||||
|
||||
operandeStack.push(res)
|
||||
|
||||
else:
|
||||
operandeStack.push(token)
|
||||
|
||||
return operandeStack.pop()
|
||||
|
||||
def needPar(operande, operator, posi = "after"):
|
||||
"""Says whether or not the operande needs parenthesis
|
||||
|
||||
:param operande: the operande
|
||||
:param operator: the operator
|
||||
:param posi: "after"(default) if the operande will be after the operator, "before" othewise
|
||||
:returns: bollean
|
||||
"""
|
||||
|
||||
priority = {"*" : 3, "/": 3, "+": 2, "-":2}
|
||||
|
||||
if isNumber(operande) and operande < 0:
|
||||
return 1
|
||||
elif not isNumber(operande):
|
||||
# Si c'est une grande expression ou un chiffre négatif
|
||||
stand_alone = get_main_op(operande)
|
||||
# Si la priorité de l'operande est plus faible que celle de l'opérateur
|
||||
#debug_var("stand_alone",stand_alone)
|
||||
#debug_var("operande", type(operande))
|
||||
minor_priority = priority[get_main_op(operande)] < priority[operator]
|
||||
# Si l'opérateur est -/ pour after ou juste / pour before
|
||||
special = (operator in "-/" and posi == "after") or (operator in "/" and posi == "before")
|
||||
|
||||
return stand_alone and (minor_priority or special)
|
||||
else:
|
||||
return 0
|
||||
|
||||
def get_main_op(tokens):
|
||||
"""Getting the main operation of the list of tokens
|
||||
|
||||
:param exp: the list of tokens
|
||||
:returns: the main operation (+, -, * or /) or 0 if the expression is only one element
|
||||
|
||||
"""
|
||||
|
||||
priority = {"*" : 3, "/": 3, "+": 2, "-":2}
|
||||
|
||||
parStack = Stack()
|
||||
#tokenList = exp.split(" ")
|
||||
|
||||
if len(tokens) == 1:
|
||||
# Si l'expression n'est qu'un élément
|
||||
return 0
|
||||
|
||||
main_op = []
|
||||
|
||||
for token in tokens:
|
||||
if token == "(":
|
||||
parStack.push(token)
|
||||
elif token == ")":
|
||||
parStack.pop()
|
||||
elif isOperation(token) and parStack.isEmpty():
|
||||
main_op.append(token)
|
||||
|
||||
return min(main_op, key = lambda s: priority[s])
|
||||
|
||||
|
||||
def expand_list(list_list):
|
||||
"""Expand list of list
|
||||
|
||||
:param list: the list to expande
|
||||
:returns: list of expanded lists
|
||||
|
||||
:Example:
|
||||
|
||||
>>> expand_list([1,2,[3,4],5,[6,7,8]])
|
||||
[[1, 2, 3, 5, 6], [1, 2, 4, 5, 7], [1, 2, 4, 5, 8]]
|
||||
>>> expand_list([1,2,4,5,6,7,8])
|
||||
[[1, 2, 4, 5, 6, 7, 8]]
|
||||
|
||||
"""
|
||||
list_in_list = [i for i in list_list if type(i) == list].copy()
|
||||
|
||||
try:
|
||||
nbr_ans_list = max([len(i) for i in list_in_list])
|
||||
|
||||
ans = [list_list.copy() for i in range(nbr_ans_list)]
|
||||
for (i,l) in enumerate(ans):
|
||||
for (j,e) in enumerate(l):
|
||||
if type(e) == list:
|
||||
ans[i][j] = e[min(i,len(e)-1)]
|
||||
# S'il n'y a pas eut d'étapes intermédiaires (2e exemple)
|
||||
except ValueError:
|
||||
ans = [list_list]
|
||||
|
||||
return ans
|
||||
|
||||
def print_steps(steps):
|
||||
"""Juste print a list
|
||||
|
||||
:param steps: @todo
|
||||
:returns: @todo
|
||||
|
||||
"""
|
||||
print("{first} \t = {sec}".format(first = str_from_postfix(steps[0]), sec = str_from_postfix(steps[1])))
|
||||
for i in steps[2:]:
|
||||
print("\t\t = {i}".format(i=str_from_postfix(i)))
|
||||
|
||||
|
||||
def str_from_postfix(postfix):
|
||||
"""Return the string representing the expression
|
||||
|
||||
:param postfix: a postfix ordered list of tokens
|
||||
:returns: the corresponding string expression
|
||||
|
||||
"""
|
||||
infix = postfixToInfix(postfix)
|
||||
return infix
|
||||
|
||||
|
||||
def debug_var(name, var):
|
||||
"""print the name of the variable and the value
|
||||
|
||||
:param name: the name of the variable
|
||||
:param var: the variable we want information
|
||||
"""
|
||||
print(name, ": ", var)
|
||||
|
||||
|
||||
def test(exp):
|
||||
"""Make various test on an expression
|
||||
|
||||
"""
|
||||
print("-------------")
|
||||
print("Expression ",exp)
|
||||
tokens = str2tokens(exp)
|
||||
postfix = infixToPostfix(tokens)
|
||||
#print("Postfix " , postfix)
|
||||
#print(computePostfix(postfix))
|
||||
#print("Bis")
|
||||
steps = [postfix]
|
||||
steps += computePostfixBis(postfix)
|
||||
print_steps(steps)
|
||||
#print(postfixToInfix(postfix))
|
||||
#print(get_main_op(exp))
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
exp = "1 + 3 * 5"
|
||||
test(exp)
|
||||
|
||||
#exp = "2 * 3 * 3 * 5"
|
||||
#test(exp)
|
||||
|
||||
#exp = "2 * 3 + 3 * 5"
|
||||
#test(exp)
|
||||
|
||||
#exp = "2 * ( 3 + 4 ) + 3 * 5"
|
||||
#test(exp)
|
||||
#
|
||||
#exp = "2 * ( 3 + 4 ) + ( 3 - 4 ) * 5"
|
||||
#test(exp)
|
||||
#
|
||||
#exp = "2 * ( 2 - ( 3 + 4 ) ) + ( 3 - 4 ) * 5"
|
||||
#test(exp)
|
||||
#
|
||||
#exp = "2 * ( 2 - ( 3 + 4 ) ) + 5 * ( 3 - 4 )"
|
||||
#test(exp)
|
||||
#
|
||||
#exp = "2 + 5 * ( 3 - 4 )"
|
||||
#test(exp)
|
||||
#
|
||||
#exp = "( 2 + 5 ) * ( 3 - 4 )"
|
||||
#test(exp)
|
||||
#
|
||||
#exp = "( 2 + 5 ) * ( 3 * 4 )"
|
||||
#test(exp)
|
||||
|
||||
#exp = "( 2 + 5 - 1 ) / ( 3 * 4 )"
|
||||
#test(exp)
|
||||
|
||||
exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 12"
|
||||
test(exp)
|
||||
|
||||
exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 2"
|
||||
test(exp)
|
||||
|
||||
exp = "( 2 + 5 ) / ( 3 * 4 ) + 1 / 12 + 5 * 5"
|
||||
test(exp)
|
||||
|
||||
#print(expand_list([1,2,['a','b','c'], 3, ['d','e']]))
|
||||
|
||||
## Ce denier pose un soucis. Pour le faire marcher il faudrai implémenter le calcul avec les fractions
|
||||
#exp = "( 2 + 5 ) / 3 * 4"
|
||||
#test(exp)
|
||||
import doctest
|
||||
doctest.testmod()
|
||||
|
||||
|
||||
# -----------------------------
|
||||
# Reglages pour 'vim'
|
||||
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
|
||||
# cursor: 16 del
|
||||
@ -1,115 +0,0 @@
|
||||
#!/usr/bin/env python
|
||||
# encoding: utf-8
|
||||
|
||||
from generic import Stack
|
||||
from calculus import isNumber, doMath
|
||||
|
||||
|
||||
class Expression(object):
|
||||
"""An arithmetic expression"""
|
||||
|
||||
priority = {"*" : 3, "/": 3, "+": 2, "-":2, "(": 1}
|
||||
|
||||
def __init__(self, exp, fix = "infix"):
|
||||
"""Initiate the expression.
|
||||
|
||||
:param exp: the string representing the expression (infx form by default)
|
||||
:param fix: form of the expression infix (default) - postfix - prefix
|
||||
|
||||
"""
|
||||
if fix == "infix":
|
||||
self._exp_infix = exp
|
||||
self._token_infix = exp.split(" ")
|
||||
elif fix == "postfix":
|
||||
self._token_postfix = exp
|
||||
else:
|
||||
print("Pas encore fait!")
|
||||
|
||||
def infixToPostfix(self):
|
||||
"""Convert the infix expression into postfix expression.
|
||||
"""
|
||||
#@todo importer les exemples
|
||||
opStack = Stack()
|
||||
postfixList = []
|
||||
|
||||
for token in self._token_infix:
|
||||
if token == "(":
|
||||
opStack.push(token)
|
||||
elif token == ")":
|
||||
topToken = opStack.pop()
|
||||
while topToken != "(":
|
||||
postfixList.append(topToken)
|
||||
topToken = opStack.pop()
|
||||
elif token in "+-*/":
|
||||
while (not opStack.isEmpty()) and (self.priority[opStack.peek()] >= self.priority[token]):
|
||||
postfixList.append(opStack.pop())
|
||||
opStack.push(token)
|
||||
else:
|
||||
postfixList.append(token)
|
||||
|
||||
while not opStack.isEmpty():
|
||||
postfixList.append(opStack.pop())
|
||||
|
||||
self._token_postfix = postfixList
|
||||
self._exp_postfix = " ".join(postfixList)
|
||||
|
||||
def computePostfix(self):
|
||||
"""Compute a postfix expression like a good student
|
||||
|
||||
:returns: list of steps to reach the result (postfix form)
|
||||
|
||||
"""
|
||||
tokenList = self._token_postfix.copy()
|
||||
tmpTokenList = []
|
||||
# on va chercher les motifs du genre A B + pour les calculer
|
||||
while len(tokenList) > 2:
|
||||
#print(tokenList[2])
|
||||
if isNumber(tokenList[0]) and isNumber(tokenList[1]) and tokenList[2] in "+-*/":
|
||||
# S'il y a une opération à faire
|
||||
op1 = tokenList[0]
|
||||
op2 = tokenList[1]
|
||||
token = tokenList[2]
|
||||
res = doMath(token, op1, op2)
|
||||
|
||||
tmpTokenList.append(res)
|
||||
|
||||
# Comme on vient de faire le calcul, on peut détruire aussi les deux prochains termes
|
||||
del tokenList[0:3]
|
||||
else:
|
||||
tmpTokenList.append(tokenList[0])
|
||||
|
||||
del tokenList[0]
|
||||
tmpTokenList += tokenList
|
||||
|
||||
if len(tmpTokenList) > 1:
|
||||
next_steps = Expression(tmpTokenList, fix = "postfix").computePostfix()
|
||||
else:
|
||||
next_steps = tmpTokenList
|
||||
print(self._exp_postfix)
|
||||
return [self._exp_postfix] + next_steps
|
||||
|
||||
|
||||
def test(exp):
|
||||
"""Make various test on an expression
|
||||
|
||||
"""
|
||||
print("-------------")
|
||||
print("Expression ",exp)
|
||||
expression = Expression(exp)
|
||||
expression.infixToPostfix()
|
||||
print(expression.computePostfix())
|
||||
|
||||
if __name__ == '__main__':
|
||||
exp = "1 + 3 * 5"
|
||||
test(exp)
|
||||
|
||||
exp = "2 * 3 * 3 * 5"
|
||||
test(exp)
|
||||
|
||||
exp = "2 * 3 + 3 * 5"
|
||||
test(exp)
|
||||
|
||||
# -----------------------------
|
||||
# Reglages pour 'vim'
|
||||
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
|
||||
# cursor: 16 del
|
||||
@ -1,191 +0,0 @@
|
||||
#!/usr/bin/env python
|
||||
# encoding: utf-8
|
||||
|
||||
|
||||
class Expression(object):
|
||||
"""A calculus expression. Today it can andle only expression with numbers later it will be able to manipulate unknown"""
|
||||
|
||||
priority = {"*" : 3, "/": 3, "+": 2, "-":2, "(": 1}
|
||||
|
||||
def __init__(self, exp):
|
||||
""" Initiate the expression.
|
||||
|
||||
:param exp: the expression. It can be a string or a list of tokens. It can be infix or postfix expression
|
||||
"""
|
||||
self._tokens = {}
|
||||
self._strings = {}
|
||||
if type(exp) == list:
|
||||
fix = self.get_fix(exp)
|
||||
self._tokens[fix] = exp
|
||||
elif type(exp) == str:
|
||||
tokens = self.parseExp(exp)
|
||||
fix = self.get_fix(tokens)
|
||||
self._tokens[fix] = tokens
|
||||
self._strings[fix] = exp
|
||||
else:
|
||||
raise ValueError("The expression needs to be a string or a list of token")
|
||||
|
||||
# ---------------------
|
||||
# String parsing
|
||||
|
||||
# @classmethod ????
|
||||
def parseExp(self, exp):
|
||||
""" Parse the expression, ie tranform a string into a list of tokens
|
||||
|
||||
:param exp: The expression (a string)
|
||||
:returns: list of token
|
||||
|
||||
"""
|
||||
return exp.split(" ")
|
||||
|
||||
# ---------------------
|
||||
# "fix" recognition
|
||||
|
||||
def get_fix(self, tokens):
|
||||
""" Give the "fix" of an expression
|
||||
infix -> A + B
|
||||
prefix -> + A B
|
||||
postfix -> A B +
|
||||
|
||||
:param exp: the expression (list of token)
|
||||
:returns: the "fix" (infix, postfix, prefix)
|
||||
|
||||
"""
|
||||
if tokens[0] in "+-*/":
|
||||
return "prefix"
|
||||
elif token[0] not in "+-*/" ans token[1] not in "+-*/":
|
||||
return "postfix"
|
||||
else:
|
||||
return "infix"
|
||||
|
||||
# ----------------------
|
||||
# Expressions - tokens getters
|
||||
|
||||
def tokens(self, fix = "infix"):
|
||||
"""Get the list of tokens with the wanted fix
|
||||
|
||||
:param fix: the fix wanted (infix default)
|
||||
:returns: list of tokens
|
||||
|
||||
"""
|
||||
# Si ce fix n'a pas encore été enregistré
|
||||
if fix not in self._tokens:
|
||||
# Il peut venir de la version string
|
||||
if fix in self._string:
|
||||
self._tokens[fix] = self.parseExp(self._string[fix])
|
||||
# Sinon il faut le calculer à partir d'une autre forme
|
||||
else:
|
||||
fix_transfo = "to" + fix.capitalize()
|
||||
getattr(self,fix_transfo)()
|
||||
|
||||
return self._tokens[fix]
|
||||
|
||||
##### On en est là,il faudra faire attention à bien vérifier ce que les "to..." enregistre (string ou tokens)
|
||||
|
||||
def string(self, fix = "infix"):
|
||||
"""Get the string with the wanted fix
|
||||
|
||||
:param fix: the fix wanted (infix default)
|
||||
:returns: the string representing the expression
|
||||
|
||||
"""
|
||||
# Si ce fix n'a pas encore été enregistré
|
||||
if fix not in self._string:
|
||||
# Il peut venir de la version string
|
||||
if fix in self._tokens:
|
||||
self._string[fix] = self.parseExp(self._string[fix])
|
||||
# Sinon il faut le calculer à partir d'une autre forme
|
||||
else:
|
||||
fix_transfo = "to" + fix.capitalize()
|
||||
getattr(self,fix_transfo)()
|
||||
|
||||
return self._string[fix]
|
||||
|
||||
# ----------------------
|
||||
# "fix" tranformations
|
||||
|
||||
def toPostfix(self):
|
||||
""" Transorm the expression into postfix form using the infix form"""
|
||||
pass
|
||||
|
||||
def toInfix(self):
|
||||
""" Tranform the expression into infix form using postfix form"""
|
||||
pass
|
||||
|
||||
# ---------------------
|
||||
# Tools for placing parenthesis in infix notation
|
||||
|
||||
def needPar(operande, operator, posi = "after"):
|
||||
""" Says whether or not the operande needs parenthesis
|
||||
|
||||
:param operande: the operande
|
||||
:param operator: the operator
|
||||
:param posi: "after"(default) if the operande will be after the operator, "before" othewise
|
||||
:returns: bollean
|
||||
"""
|
||||
if isNumber(operande) and "-" in operande:
|
||||
return 1
|
||||
elif not isNumber(operande):
|
||||
# Si c'est une grande expression ou un chiffre négatif
|
||||
stand_alone = get_main_op(operande)
|
||||
# Si la priorité de l'operande est plus faible que celle de l'opérateur
|
||||
minor_priority = self.priority[get_main_op(operande)] < self.priority[operator]
|
||||
# Si l'opérateur est -/ pour after ou juste / pour before
|
||||
special = (operator in "-/" and posi == "after") or (operator in "/" and posi == "before")
|
||||
|
||||
return stand_alone and (minor_priority or special)
|
||||
else:
|
||||
return 0
|
||||
|
||||
# J'aime pas bien cette endroit faudrait que ce soit une méthode qui s'applique uniquement à l'expression en question (self) pas à n'importe quel string, ça serait plus propre.
|
||||
def get_main_op(exp):
|
||||
""" Gives the main operation of the expression
|
||||
|
||||
:param exp: the expression
|
||||
:returns: the main operation (+, -, * or /) or 0 if the expression is only one element
|
||||
|
||||
"""
|
||||
parStack = Stack()
|
||||
tokenList = exp.split(" ")
|
||||
|
||||
if len(tokenList) == 1:
|
||||
# Si l'expression n'est qu'un élément
|
||||
return 0
|
||||
|
||||
main_op = []
|
||||
|
||||
for token in tokenList:
|
||||
if token == "(":
|
||||
parStack.push(token)
|
||||
elif token == ")":
|
||||
parStack.pop()
|
||||
elif token in "+-*/" and parStack.isEmpty():
|
||||
main_op.append(token)
|
||||
|
||||
return min(main_op, key = lambda s: priority[s])
|
||||
|
||||
# ---------------------
|
||||
# Computing the expression
|
||||
|
||||
def compute(self):
|
||||
""" Recursive method for computing as a student the expression
|
||||
:returns: list of steps needed to reach the result
|
||||
|
||||
"""
|
||||
pass
|
||||
|
||||
def doMath(op, op1, op2):
|
||||
"""Compute "op1 op op2"
|
||||
|
||||
:param op: operator
|
||||
:param op1: first operande
|
||||
:param op2: second operande
|
||||
:returns: string representing the result
|
||||
|
||||
"""
|
||||
return str(eval(op1 + op + op2))
|
||||
|
||||
# -----------------------------
|
||||
# Reglages pour 'vim'
|
||||
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
|
||||
# cursor: 16 del
|
||||
Loading…
Reference in New Issue
Block a user