App works perfectly locally but crushes after deployment- seems like it does so when I get to points where operations on variables take place.
I've looked up other similar questions but with no luck.
I assume I am making some fundamental mistake however I am not able to identify it. I was thinking perhaps something with Flask app session settings and the way requests are handled.
It's my first independent project and I realize that there must be more pythonic way of achieving things however I was just focusing on problem solving with this one.
After deployment app either crushes (NoneType object) or goes into the loop looking like variables are not being set at all- none of which happens when app is tested locally.
Fragment of code (up to the point where app crushes- I don't want to spam entire code here):
from flask import Flask, render_template, request, flash, redirect, url_for
import codecs
import datetime
from sq_search import *
from list_creator import list_creator
app = Flask(__name__)
app.secret_key= 'dev'
# Global variables created- to avoid "not defined error" in certain parts of script-
# depending on user choice
stype=None
namesearch=None
final_name=None
results=None
ticker_result=None
name_result=None
company=None
from_date=None
to_date=None
disable_1st=None
email_name=None
@app.route('/')
def home():
# Setting global variables used in search to None- in case user stops search, goes to
# other page and returns back to search- avoids errors
global stype, namesearch, final_name, results, ticker_result, name_result, company
stype=None
namesearch=None
final_name=None
results=None
ticker_result=None
name_result=None
company=None
return render_template("home.html")
@app.route('/seng/', methods=['POST','GET'])
def seng():
global stype, namesearch, final_name, results, ticker_result, name_result
search_options_title="Chosen search options:"
# Using 'try except' block to avoid errors- in case user presses go back or refreshes the
# page the script will execute further and eventuall assign variables to None letting
# the user start new search rather than returning error
if stype == None:
try:
if request.method=="POST":
global search_options
stype=request.form["stype"]
if stype == 'name':
search_options=[">Chosing by Name"]
return render_template("seng.html", pic1="pic1.html", search_options=search_options_title+"<br><br>", search_by=search_options[0],
choice2="choice2.html")
if stype == 'ticker':
search_options=[">Chosing by ticker"]
return render_template("seng.html", pic1="pic1.html", search_options=search_options_title+"<br><br>", search_by=search_options[0],
choice2="choice2tick.html")
except:
pass
if namesearch==None and stype=='ticker':
try:
if request.method=="POST":
ticker_search=request.form["tickersearch"].upper()
get_ticker(ticker_search)
if ticker_result:
stype=None
return redirect(url_for('final_stage'))
else:
ticker_search=None
notick_error="<p style='font-size: 1.4vw;color: red'>Ticker incorrect! Inster S&P 500 ticker, search again by name or browse all companies from main menu</p>"
return render_template("seng.html", pic1="pic1.html", search_options=search_options_title+"<br><br>", search_by=search_options[0],
choice2="choice2tick.html", notick_error=notick_error)
except:
stype=None
pass
elif namesearch==None and stype=='name':
if len(search_options) > 1: # Delets previously used search from right side menu if there was one already
del search_options[1]
if request.method=="POST":
try:
namesearch=request.form["namesearch"]
if namesearch != None:
get_names(namesearch)
if results:
list_creator(results) # Creates HTML script with drop down list of all matches
search_options.append(namesearch)
number_of_options=f"<br><p style='font-size: 1.3vw'>Number of matching results: {len(results)}</p>"
results=None
namesearch=None
return render_template("seng.html",pic1="pic1.html", pic2="pic2.html", search_options=search_options_title+"<br><br>",
search_by=search_options[0]+"<br><br>", search_name=">Look for: '"+search_options[1]+"'<br>",
number_of_options=number_of_options, choice3="choice3.html")
else:
noname_error= "<br><p style='font-size: 1.4vw;color: red'>No matches- no such company in S&P 500. Broaden the search or browse all companies in main menu</p>"
results=None
namesearch=None
return render_template("seng.html", pic1="pic1.html", search_options=search_options_title+"<br><br>", search_by=search_options[0],
choice2="choice2.html", noname_error=noname_error)
except:
stype=None
namesearch=None
results=None # Setting all variables to None- in case user went back a page during search-
ticker_result=None # otherwise would return an error
final_name=None
name_result=None
if final_name==None:
try:
if request.method=="POST":
final_name=request.form["name_final"]
name_result=get_all_byname(final_name) # Function retrives full data based on final user choice from drop down list
return redirect(url_for('final_stage'))
except:
pass
else:
namesearch=None # Same reason as previously- avoiding errors
stype=None
final_name=None
results=None
ticker_result=None
name_result=None
return render_template("seng.html", choice1="choice1.html")
