cli.py

# cli.py
# -*- coding: utf-8 -*-
from __future__ import print_function, unicode_literals
import six
import os, re
from PyInquirer import style_from_dict, Token, prompt, print_json, Separator
from PyInquirer import Validator, ValidationError
from pprint import pprint

try:
  import colorama
  colorama.init()
except ImportError:
  colorama = None
  
try:
  from termcolor import colored
except ImportError:
  colored = None
  
style = style_from_dict({
  Token.QuestionMark: '#673ab7 bold',
  Token.Answer: '#f44336 bold',
  Token.Instruction: '',  # default
  Token.Separator: '#cc5454',
  Token.Selected: '#cc5454',  # default
  Token.Pointer: '#673ab7 bold',
  Token.Question: '',
})

class EmptyValidator(Validator):
  def validate(self, value):
    if len(value.text):
      return True
    else:
      raise ValidationError(message="You can't leave this blank", cursor_position=len(value.text))

class EmailValidator(Validator):
  pattern = r"\"?([-a-zA-Z0-9.`?{}]+@\w+\.\w+)\"?"
  def validate(self, email):
    if len(email.text):
      if re.match(self.pattern, email.text):
        return True
      else:
        raise ValidationError(message="Invalid email",cursor_position=len(email.text))
    else:
      raise ValidationError(message="You can't leave this blank",cursor_position=len(email.text))

def take_user_order():
  questions = [{
    'type': 'list',
    'name': 'name',
    'message': 'Name (Product):',
    'choices': ["Rice", "Milk", "Chocolate", "Pizza", "Taco", "Zobo", "Boli"]
    },
    {
    'type': 'input',
    'name': 'customer_email',
    'message': "Customer's Email:",
    'validate': EmailValidator,
    },
    {
    'type': 'input',
    'name': 'customer_name',
    'message': "Customer's Name:",
    'validate': EmptyValidator,
    },
    {
    'type': 'input',
    'name': 'quantity',
    'message': "Quantity:",
    'validate': EmptyValidator,
    },
    {
    'type': 'input',
    'name': 'customer_address',
    'message': "Customer's Address:",
    'validate': EmptyValidator,
    'multiline': True
    }]
  
    answers = prompt(questions, style=style)
    return answers
  
answer = take_user_order() # to initialize the prompt
print(answer)