From 45a816c46cca1004bd586ea4c16496d92c84991a Mon Sep 17 00:00:00 2001
From: tsb1995 <47466105+tsb1995@users.noreply.github.com>
Date: Fri, 20 Dec 2019 12:58:38 -0800
Subject: [PATCH] create and implement the setup_symbols function, symbols are
 preset at start

---
 __pycache__/app.cpython-37.pyc | Bin 4557 -> 4830 bytes
 app.py                         |  19 +++++++++++--------
 helpers.py                     |   8 ++++++++
 3 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/__pycache__/app.cpython-37.pyc b/__pycache__/app.cpython-37.pyc
index 5382b4606cbfeff6d76b25d51869c81503b213fc..a81c4b681e39cccb89fb902403f56beaea9b79f6 100644
GIT binary patch
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diff --git a/app.py b/app.py
index a0cfe9e..f2a466a 100644
--- a/app.py
+++ b/app.py
@@ -4,6 +4,8 @@ from helpers import apology
 
 app = Flask(__name__)
 
+x, y, z, t, X, Y, Z, T = symbols('x y z t X Y Z T')
+
 @app.route('/')
 def hello():
     return render_template('index.html')
@@ -15,14 +17,8 @@ def differentiation():
         if not request.form.get("function"):
             return apology("must provide a function", 400)
         f = request.form.get("function")
-        """
-        TODO:
-        take Function
-        analyse to find most common letter (our variable)
-        set that as the basis for symbols
-        """
-        x = symbols('x')
-        f = sympify(f)
+
+        f = setup_symbols(f)
 
         # Differentiate and return latex expressions
         fprime = latex(f.diff(x))
@@ -199,6 +195,13 @@ def errorhandler(e):
         e = InternalServerError()
     return apology(e.name, e.code)
 
+def setup_symbols(f):
+    f = sympify(f)
+    for letter in [x, y, z, t, X, Y, Z, T]:
+        f = f.subs(letter, x)
+
+    return f
+
 
 
 if __name__ == '__main__':
diff --git a/helpers.py b/helpers.py
index 845a7f4..d1fb3d8 100644
--- a/helpers.py
+++ b/helpers.py
@@ -2,6 +2,7 @@ import requests
 
 from flask import redirect, render_template, request, session
 from functools import wraps
+from sympy import *
 
 
 def apology(message, code=400):
@@ -36,3 +37,10 @@ def login_required(f):
 def usd(value):
     """Format value as USD."""
     return f"${value:,.2f}"
+
+def setup_symbols(f):
+    f = sympify(f)
+    for letter in [x, y, z, t, X, Y, Z, T]:
+        f = f.subs(letter, x)
+
+    return f