Flask 101

simple-3.py

from flask import Flask, request, render_template, jsonify, json, abort

app = Flask(__name__)
userList = []
'''
{
  "username": "johnsmith",
  "age": 24,
  "gender": "male"
}
'''

def hasUsername(username):
  for i, user in enumerate(userList):
    if user["username"] == username:
      return i

  return -1

@app.route('/')
def index():
  return 'Index Page'

@app.route('/hello/')
@app.route('/hello/<name>')
def hello(name=None):
  return render_template('hello.html', name=name)

@app.route('/users', methods=['GET', 'POST'])
def users():
  if request.method == 'POST':
    if request.json:
      user = json.loads(request.data)
      if not type(user).__name__ == 'dict':
        print("invalid user format")
        abort(400)
      elif not ("username" in user and type(user["username"]).__name__ == 'str') or (hasUsername(user["username"]) > -1):
        print("invalid username")
        abort(400)
      elif not ("age" in user and type(user["age"]).__name__ == "int"):
        print("invalid age")
        abort(400)
      elif not ("gender" in user and type(user["gender"]).__name__ == 'str' and (user["gender"] == "male" or user["gender"] == "female")):
        print("invalid gender")
        abort(400)
      else:
        userList.append({
          "username": user["username"],
          "age": user["age"],
          "gender": user["gender"]
        })
        return "post user success"
    else:
      abort(400)
  else:
      return jsonify(userList)

@app.route('/users/<string:username>')
def show_user_profile(username):
  index = hasUsername(username)
  if index > -1:
    return jsonify(userList[index])
  else:
    abort(404)

simple.py

from flask import Flask, request, render_template, jsonify, json, abort

app = Flask(__name__)
userList = []
'''
{
  "username": "johnsmith",
  "age": 24,
  "gender": "male"
}
'''

def hasUsername(username):
  for i, user in enumerate(userList):
    if user["username"] == username:
      return i

  return -1

@app.route('/')
def index():
  return 'Index Page'

@app.route('/hello/')
@app.route('/hello/<name>')
def hello(name=None):
  return render_template('hello.html', name=name)

@app.route('/users', methods=['GET', 'POST'])
def users():
  if request.method == 'POST':
    if request.json:
      user = json.loads(request.data)
      print type(user["username"]), type(user["age"]), type(user["gender"])
      if not (user.has_key("username") and type(user["username"]).__name__ == 'unicode') or hasUsername(user["username"]) > -1:
        print "invalid username"
        abort(400)
      elif not (user.has_key("age") and type(user["age"]).__name__ == "int"):
        print "invalid age"
        abort(400)
      elif not (user.has_key("gender") and type(user["gender"]).__name__ == 'unicode' and (user["gender"].encode("utf-8") == "male" or user["gender"].encode("utf-8") == "female")):
        print "invalid gender"
        abort(400)
      else:
        userList.append({
          "username": user["username"],
          "age": user["age"],
          "gender": user["gender"]
        })
        return "post user success"
    else:
      abort(400)
  else:
      return jsonify(userList)

@app.route('/users/<string:username>')
def show_user_profile(username):
  index = hasUsername(username)
  if index > -1:
    return jsonify(userList[index])
  else:
    abort(404)