Question: ```
from flask import Flask, render_template, request, redirect, session
import random
app = Flask(__name__)
app.secret_key = "guess_secret"

@app.route('/') 
def landing_page():
    if 'num' not in session:
        session['num'] = random.randrange(0,101)
    if 'message' not in session:
        session['message'] = ''
    if 'color' not in session:
        session['color'] = ''
    return render_template('indexa.html', msg = session['message'], color = session['color'])

@app.route('/execute', methods=['POST'])
def check_guess():
    session(['guess']) = int(request.form['guess'])
if (session['guess']==session['num']):
    session['message'] = str(session['num'])+'was the number!'
    session['color']='green'
elif int(request.form['guess']) < session['num']:
    session['message'] = 'Too low.'
    session['color']='red'
else: 
    session['message'] = 'Too high.'
    session['color']='red'
    return redirect('/')

@app.route('/reset', methods=['POST'])
def reset():
    session.pop('number') 
    session.pop('guess')
    session.pop('color')
    return redirect('/')

app.run(debug=True)

```

I'm trying to create a guessing game flask page.
keeps coming back "File "guess.py", line 27 session['color']='red' ^ IndentationError: unindent does not match any outer indentation level

Answer: 
Even though the code seems to be syntactically right, it looks as if this part:

```
@app.route('/execute', methods=['POST'])
def check_guess():
    session(['guess']) = int(request.form['guess'])
if (session['guess']==session['num']):
    session['message'] = str(session['num'])+'was the number!'
    session['color']='green'
elif int(request.form['guess']) < session['num']:
    session['message'] = 'Too low.'
    session['color']='red'
else: 
    session['message'] = 'Too high.'
    session['color']='red'
    return redirect('/')

```

was probably meant to be this:

```
@app.route('/execute', methods=['POST'])
def check_guess():
    session(['guess']) = int(request.form['guess'])
    if (session['guess']==session['num']):
        session['message'] = str(session['num'])+'was the number!'
        session['color']='green'
    elif int(request.form['guess']) < session['num']:
        session['message'] = 'Too low.'
        session['color']='red'
    else: 
        session['message'] = 'Too high.'
        session['color']='red'
    return redirect('/')

```

Also be sure not to mix tabs and spaces. If you use spaces for indent, make sure there are no tabs at all in the code.
Your code is not indented correctly try below code 

```
from flask import Flask, render_template, request, redirect, session
import random
app = Flask(__name__)
app.secret_key = "guess_secret"

@app.route('/') 
def landing_page():
    if 'num' not in session:
        session['num'] = random.randrange(0,101)
    if 'message' not in session:
        session['message'] = ''
    if 'color' not in session:
        session['color'] = ''
    return render_template('indexa.html', msg = session['message'], color = session['color'])

@app.route('/execute', methods=['POST'])
def check_guess():
    session(['guess']) = int(request.form['guess'])
if (session['guess']==session['num']):
    session['message'] = str(session['num'])+'was the number!'
    session['color']='green'
elif int(request.form['guess']) < session['num']:
    session['message'] = 'Too low.'
    session['color']='red'
else: 
    session['message'] = 'Too high.'
    session['color']='red'
    return redirect('/')

@app.route('/reset', methods=['POST'])
def reset():
    session.pop('number') 
    session.pop('guess')
    session.pop('color')
    return redirect('/')

app.run(debug=True)

```