 

# Vending Machine

#The machine can supply the following products with corresponding pricing (In
# Shekels):
products = {
'Coke' : 7,
'Sprite' : 7,
'Twix' : 4.5,
'Bisli Grill': 5
}

# The change should only be with coins
# of type 10/5/1
change_coins = {1, 5, 10}

# receives a string which contains the
# following structure separated by white spaces:
# "<Cash-in-NIS> <Product>"
# e.g. '10 Coke'
def purchase_request(purchase_string):
  # split to purchase info items
  purchase_info_items = purchase_string.split()
  # get number of items
  info_items_count = len(purchase_info_items)
  #check that we have at least 2 items
  if info_items_count < 2:
    return "at least two items required in the request string"
  # get the requested product
  requested_product = purchase_info_items.pop();
  # search if the rquested product is one of ours
  found_product = None
  for cur_prod in products.keys():
    if cur_prod.lower() == requested_product.lower():
      found_product = cur_prod
      break

  if found_product is None:
    return f"we don't have the request item: {found_product}"
  
  found_product_price = products[found_product]
  if found_product_price is None:
    return f"we don't have the request item: {found_product}"
  
  input_coin_sum = 0;
  for cur_item in purchase_info_items:
    # check that value is nomeric
    if not cur_item.isnumeric():
      return f"we don't support a coin with the value that isn't a numeric string, your input: {cur_item}"
      
    cur_change = int(cur_item)
    # The system can only accept coins of type 10/5/1, other numbers should be
    # considered as wrong input.
    if cur_change not in change_coins:
      return f" we don't support a coin with the value: {cur_change}"
    
    input_coin_sum += cur_change
    
  if found_product_price > input_coin_sum:
    return f"{input_coin_sum} is not enough for {found_product}"

  # we approve this purchase, let's do the change
  change_back = input_coin_sum - found_product_price

  # we approve this purchase, let's do the change
  res_array = []
  # order coins
  ordered_change_coins = list(change_coins)
  # sort by value
  ordered_change_coins.sort()
  # big coins first
  ordered_change_coins.reverse()

  for cur_coin in ordered_change_coins:
   while change_back >= cur_coin:
      res_array.append(f"{cur_coin}")
      change_back -= cur_coin
  
  res_array.append(found_product)
  
  res = ' '.join(res_array)
  
  return res

print(purchase_request("5 5 coke"))

created 3 years ago

Python Online Compiler

Write, Run & Share Python code online using OneCompiler's Python online compiler for free. It's one of the robust, feature-rich online compilers for python language, supporting both the versions which are Python 3 and Python 2.7. Getting started with the OneCompiler's Python editor is easy and fast. The editor shows sample boilerplate code when you choose language as Python or Python2 and start coding.

Taking inputs (stdin)

OneCompiler's python online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample python program which takes name as input and print your name with hello.

import sys
name = sys.stdin.readline()
print("Hello "+ name)

About Python

Python is a very popular general-purpose programming language which was created by Guido van Rossum, and released in 1991. It is very popular for web development and you can build almost anything like mobile apps, web apps, tools, data analytics, machine learning etc. It is designed to be simple and easy like english language. It's is highly productive and efficient making it a very popular language.

Tutorial & Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition IF-ELSE is used.

if conditional-expression
    #code
elif conditional-expression
    #code
else:
    #code

Note:

Indentation is very important in Python, make sure the indentation is followed correctly

2. For:

For loop is used to iterate over arrays(list, tuple, set, dictionary) or strings.

Example:

mylist=("Iphone","Pixel","Samsung")
for i in mylist:
    print(i)

3. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while condition  
    #code

Collections

There are four types of collections in Python.

1. List:

List is a collection which is ordered and can be changed. Lists are specified in square brackets.

Example:

mylist=["iPhone","Pixel","Samsung"]
print(mylist)

2. Tuple:

Tuple is a collection which is ordered and can not be changed. Tuples are specified in round brackets.

Example:

myTuple=("iPhone","Pixel","Samsung")
print(myTuple)

Below throws an error if you assign another value to tuple again.

myTuple=("iPhone","Pixel","Samsung")
print(myTuple)
myTuple[1]="onePlus"
print(myTuple)

3. Set:

Set is a collection which is unordered and unindexed. Sets are specified in curly brackets.

Example:

myset = {"iPhone","Pixel","Samsung"}
print(myset)

4. Dictionary:

Dictionary is a collection of key value pairs which is unordered, can be changed, and indexed. They are written in curly brackets with key - value pairs.

Example:

mydict = {
    "brand" :"iPhone",
    "model": "iPhone 11"
}
print(mydict)

Supported Libraries

Following are the libraries supported by OneCompiler's Python compiler

Name	Description
NumPy	NumPy python library helps users to work on arrays with ease
SciPy	SciPy is a scientific computation library which depends on NumPy for convenient and fast N-dimensional array manipulation
SKLearn/Scikit-learn	Scikit-learn or Scikit-learn is the most useful library for machine learning in Python
Pandas	Pandas is the most efficient Python library for data manipulation and analysis
DOcplex	DOcplex is IBM Decision Optimization CPLEX Modeling for Python, is a library composed of Mathematical Programming Modeling and Constraint Programming Modeling