This script will make you calculate exchange with an exercize maker<\/p>\n
import random\r\n\r\nclass Exchange:\r\n '''e1 = Exchange(dollars=1000, euro=1, exchange_rate=1.18) will give you the euro for 1000 $\\\r\n d1 = Exchange(dollars=1, euro=500, exchange_rate=1.18)\r\n '''\r\n def __init__(self, dollars, euro, exchange_rate):\r\n \"If euro = 1 it changes dollars into euro and viceversa\"\r\n self.dollars = dollars\r\n self.euro = euro\r\n self.exchange_rate = exchange_rate\r\n\r\n def exchange(self):\r\n \"Calculate euro for dollars and viceversa\"\r\n if self.euro: # get euro for .... dollars\r\n return round(self.dollars \/ self.exchange_rate, 2)\r\n if self.dollars:\r\n return round(self.euro * self.exchange_rate, 2)\r\n\r\n def print(self):\r\n \"This just adds the \u20ac to the euro\"\r\n print(f\"{self.euro} \u20ac\")\r\n \r\n def pprint(self, lang=\"en\"):\r\n if lang == \"en\":\r\n self.print_sol = f\"You get {self.dollars} $ for [{self.exchange()} \u20ac] \"\r\n self.print_sol += f\" at an exchange rate of {self.exchange_rate}\"\r\n else:\r\n self.print_sol = f\"Ottieni {self.dollars} $ per [{self.exchange()} \u20ac] \"\r\n self.print_sol += f\" cal exchange_rate di {self.exchange_rate}\"\r\n #print(self.print_sol)\r\n return self.print_sol\r\n\r\n def print_ex(self, lang=\"en\"):\r\n \"Call this to print the exercises\"\r\n global cnt\r\n\r\n if self.euro:\r\n d = self.dollars\r\n c = self.exchange_rate\r\n if lang==\"en\":\r\n f = [\r\n f\"How many \u20ac you must give to get {d} $ at and exchange rate of {c}?\",\r\n f\"Change {d} $ in euro at an exchange rate of {c}.\",\r\n f\"How many \u20ac you must pay to get {d} $ at and exchange rate of {c}?\",\r\n f\"Find the \u20ac you need to buy {d} $ at and exchange rate of {c}.\",\r\n f\"If you got {d} $, how many euro you will get at {c} as exchange rate?\"\r\n ]\r\n if lang==\"it\":\r\n f = [\r\n f\"Quanti \u20ac devi pagare per acquistare {d} $ al exchange_rate EUR\/USD di {c}?\",\r\n f\"Cambia {d} $ in euro al tasso di {c}.\",\r\n f\"Calcola quanti euro ottieni vendendo {d} $ al exchange_rate pari a {c} EUR\/USD.\",\r\n f\"Con {d}$, quanti euro ottieni con un exchange_rate EUR\/USD pari a {c}?\"\r\n ]\r\n\r\n self.print_change = f\"{cnt}. {random.choice(f)}\"\r\n print(self.print_change)\r\n cnt += 1\r\n return self.print_change\r\n\r\n def dollars(self):\r\n if self.euro != 1:\r\n return self.euro() * self.exchange_rate\r\n\r\n def random(self):\r\n return random.randrange(100, 3000, 50)\r\n\r\n def random_exchange_rate(self):\r\n ch = 1 + round(random.random(), 2)\r\n # print(ch)\r\n return ch\r\n\r\n def generate_ex(self):\r\n \"generates random dollars and exchange\"\r\n self.exchange_rate = round(self.random_exchange_rate(), 2)\r\n if self.euro == 1:\r\n self.dollars = self.random()\r\n self.result = self.exchange()\r\n else:\r\n self.euro = self.random()\r\n self.result = self.exchange()\r\n # return self.euro, self.dollars, self.result\r\n\r\n def print_solution(self):\r\n print(\"Solution:\")\r\n self.pprint()\r\n print()\r\n\r\ncnt = 1\r\ndef main(save=0, solutions=0, number=10, html=1, lang=\"it\"):\r\n \"This shows 10 random exercizes made with the class Exchange\"\r\n ################## Instructions ####################\r\n # first create an istance\r\n\r\n e1 = Exchange(dollars=1000, euro=1, exchange_rate=1.18)\r\n # See how many euro you can get from 1000 $ with e1.pprint()\r\n # e1.pprint()\r\n\r\n # Let's create 10 exercizes\r\n sol = []\r\n text = []\r\n # change 10 if you want more or less exercizes\r\n print(\"Solve these exercizes:\\n ---\")\r\n for n in range(number):\r\n # Generate a random exercise\r\n e1.generate_ex()\r\n # adds the exercise to the list sol\r\n sol.append(str(cnt) + \". \" + e1.pprint(lang))\r\n e1.print_ex(lang)\r\n text.append(e1.print_change)\r\n # prints traccia and solutions\r\n print_solutions(sol)\r\n if save:\r\n if solutions:\r\n save_solutions(sol)\r\n save_text_n_sol(text, sol, html)\r\n save_text(text)\r\n else:\r\n save_text(text)\r\n\r\n\r\ndef save_text(text):\r\n \"Create text file\"\r\n text = [t for n,t in enumerate(text)]\r\n text = \"\\n\".join(text)\r\n\r\n with open(\"traccia.txt\", \"w\") as file:\r\n file.write(text)\r\n\r\ndef save_solutions(sol):\r\n \"Create text file\"\r\n sol = [t for t in sol]\r\n sol = \"\\n\".join(sol)\r\n\r\n with open(\"soluzione.txt\", \"w\") as file:\r\n file.write(sol)\r\n\r\n\r\ndef save_text_n_sol(text, sol, html):\r\n \"Create text file\"\r\n if html == 0:\r\n # text = [str(n + 1) + \" \" + t for n,t in enumerate(text)]\r\n text = \"\\n\".join(text)\r\n sol = [str(n + 1) + \" \" + t for n,t in enumerate(sol)]\r\n sol = \"\\n\".join(sol)\r\n\r\n with open(\"text_n_sol.txt\", \"w\") as file:\r\n file.write(\"Exercises:\\n\")\r\n file.write(text)\r\n file.write(\"\\n\\nSolutions:\\n\")\r\n file.write(sol)\r\n else:\r\n text = [f\"<p>{t}<\/p>\" for n,t in enumerate(text)]\r\n text = \"\\n\".join(text)\r\n sol = [f\"<p>{t}<\/p>\" for n,t in enumerate(sol)]\r\n sol = \"\\n\".join(sol)\r\n with open(\"text_n_sol.html\", \"w\") as file:\r\n file.write(\"<h2>Exercises:<\/h2>\")\r\n file.write(text)\r\n file.write(\"<h2>Solutions:<\/h2>\")\r\n file.write(sol)\r\n\r\n\r\ndef print_solutions(sol):\r\n \"Prints the solutions\"\r\n print(\"\\nSolutions\")\r\n # print only solutions\r\n for n in sol:\r\n print(n)\r\n\r\nmain(\r\n save=1, # to save a text file for the students\r\n solutions=1, # the text with solutions for the teacher\r\n number=5, # how many exercises about exchange rate\r\n html=1, # you get an html file for the students\r\n lang=\"en\") # you can choose en or it as language\r\n<\/pre>\n