Completed Cash Register Code Challenge

Pipfile

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+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+
+[dev-packages]
+pytest = "*"
+
+[requires]
+python_version = "3.9"

before_review.txt

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+Thank you for taking the time to review my work! I apologize if it took too much time to complete,
+but I would just like to note that in order for the data to be read in correctly the code must be ran
+from the main CashRegister directory, not one level deeper in the register directory. Thank you again!

input/data.csv

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+3.33, 5.01
+1.23, 4.00
+0.78, 5.00
+2.76, 3.00
+0.01, 1.00

register/cash_register.py

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+import csv
+from decimal import Decimal
+import random
+
+
+DENOMINATIONS_VALUE = {'dollar': Decimal('1.00'),
+                'quarter': Decimal('0.25'),
+                'dime': Decimal('0.10'),
+                'nickel': Decimal('0.05'),
+                'penny': Decimal('0.01')}
+
+
+def calculate_minimum_denominations(change):
+    dynamic_change = change
+    final_change = []
+    while dynamic_change >= DENOMINATIONS_VALUE['dollar']:
+        final_change.append('dollar')
+        dynamic_change = (dynamic_change - DENOMINATIONS_VALUE['dollar'])
+    while dynamic_change <= DENOMINATIONS_VALUE['dollar'] and dynamic_change > DENOMINATIONS_VALUE['quarter']:
+        final_change.append('quarter')
+        dynamic_change = (dynamic_change - DENOMINATIONS_VALUE['quarter'])
+    while dynamic_change <= DENOMINATIONS_VALUE['quarter'] and dynamic_change > DENOMINATIONS_VALUE['dime']:
+        final_change.append('dime')
+        dynamic_change = (dynamic_change - DENOMINATIONS_VALUE['dime'])
+    while dynamic_change <= DENOMINATIONS_VALUE['dime'] and dynamic_change > DENOMINATIONS_VALUE['nickel']:
+        final_change.append('nickel')
+        dynamic_change = (dynamic_change - DENOMINATIONS_VALUE['nickel'])
+    while dynamic_change <= DENOMINATIONS_VALUE['nickel'] and dynamic_change >= DENOMINATIONS_VALUE['penny']:
+        final_change.append('penny')
+        dynamic_change = dynamic_change - DENOMINATIONS_VALUE['penny'] 
+    return final_change
+
+
+def calculate_random_denominations(change):
+    denoms = ['dollar', 'quarter', 'dime', 'nickel', 'penny']
+    #print(type(change))
+    dynamic_change = change
+    final_change = []
+    while dynamic_change > Decimal('0.00'):
+        if dynamic_change >= DENOMINATIONS_VALUE['dollar']:
+            random_denom = random.choice(denoms)
+            final_change.append(random_denom)
+            dynamic_change = (dynamic_change - DENOMINATIONS_VALUE[random_denom])
+        elif dynamic_change >= DENOMINATIONS_VALUE['quarter'] and dynamic_change < DENOMINATIONS_VALUE['dollar']:
+            exception = ['dollar']
+            random_denom = random.choice([denom for denom in denoms if denom not in exception])
+            final_change.append(random_denom)
+            dynamic_change = (dynamic_change - DENOMINATIONS_VALUE[random_denom])
+        elif dynamic_change >= DENOMINATIONS_VALUE['dime'] and dynamic_change < DENOMINATIONS_VALUE['quarter']:
+            exception = ['dollar', 'quarter']
+            random_denom = random.choice([denom for denom in denoms if denom not in exception])
+            final_change.append(random_denom)
+            dynamic_change = (dynamic_change - DENOMINATIONS_VALUE[random_denom])
+        elif dynamic_change >= DENOMINATIONS_VALUE['nickel'] and dynamic_change < DENOMINATIONS_VALUE['dime']:
+            exception = ['dollar', 'quarter', 'dime']
+            random_denom = random.choice([denom for denom in denoms if denom not in exception])
+            final_change.append(random_denom)
+            dynamic_change = (dynamic_change - DENOMINATIONS_VALUE[random_denom])
+        elif dynamic_change >= DENOMINATIONS_VALUE['penny'] and dynamic_change < DENOMINATIONS_VALUE['nickel']:
+            final_change.append(DENOMINATIONS_VALUE['penny'])
+            dynamic_change = (dynamic_change - DENOMINATIONS_VALUE['penny'])
+    else:
+        pass
+    return final_change
+
+
+def sum_final_change(final_change, DENOMINATIONS_):
+    for denomination in final_change:
+        if denomination == 'dollar':
+            DENOMINATIONS_['dollar'] += 1
+        elif denomination == 'quarter':
+            DENOMINATIONS_['quarter'] += 1
+        elif denomination == 'dime':
+            DENOMINATIONS_['dime'] += 1
+        elif denomination == 'nickel':
+            DENOMINATIONS_['nickel'] += 1
+        else:
+            DENOMINATIONS_['penny'] += 1
+    return DENOMINATIONS_
+
+
+def final_change_output(change_dict):
+    final_change_str = ""
+    change_copy = {**change_dict}
+    for denom in change_copy:
+        if change_copy['dollar'] > 0:
+            if change_copy[denom] == 1:
+                final_change_str = final_change_str + "1 dollar, "
+                change_copy[denom] = 0
+            elif change_copy[denom] > 1:
+                final_change_str = final_change_str + f"{change_copy['dollar']} dollars, "
+                change_copy[denom] = 0
+        if change_copy['quarter'] > 0:
+            if change_copy[denom] == 1:
+                final_change_str = final_change_str + "1 quarter, "
+                change_copy[denom] = 0
+            elif change_copy[denom] > 1:
+                final_change_str = final_change_str + f"{change_copy['quarter']} quarters, "
+                change_copy[denom] = 0
+        if change_copy['dime'] > 0:
+            if change_copy[denom] == 1:
+                final_change_str = final_change_str + "1 dime, "
+                change_copy[denom] = 0
+            elif change_copy[denom] > 1:
+                final_change_str = final_change_str + f"{change_copy['dime']} dimes, "
+                change_copy[denom] = 0
+        if change_copy['nickel'] > 0:
+            if change_copy[denom] == 1:
+                final_change_str = final_change_str + "1 nickel, "
+                change_copy[denom] = 0
+            elif change_copy[denom] > 1:
+                final_change_str = final_change_str + f"{change_copy['nickel']} nickels, "
+                change_copy[denom] = 0
+        if change_copy['penny'] > 0:
+            if change_copy[denom] == 1:
+                final_change_str = final_change_str + "1 penny, "
+                change_copy[denom] = 0
+            elif change_copy[denom] > 1:
+                final_change_str = final_change_str + f"{change_copy['penny']} pennies, "
+                change_copy[denom] = 0
+    return final_change_str
+
+
+def main():
+    print()
+    print()
+    print("Thank you for using Creative Cash Draw Solutions Cash Register System!")
+    print()
+    print("In the data.csv file, please enter the price of the item being purchased")
+    print()
+    print("followed by the amount of money paid, separated by a comma. You may use the")
+    print()
+    print("data already in the file as a guide to input your own data, or leave it as it is.")
+    print()
+    print("After adding data, please rerun this file in order to get up to date results.") 
+    print()
+    print("The data being displayed currently is the data that was in the data.csv file before runtime.") 
+    print()
+    print()
+    print()
+    file = csv.reader(open('input/data.csv'), delimiter = ',')
+    for line in file:
+        (total, paid) = line
+        total = Decimal(total)
+        paid = Decimal(paid)
+        change = paid - total
+        rem = change % Decimal('.03')
+        DENOMINATIONS_ = {'dollar': 0,
+                        'quarter': 0,
+                        'dime': 0,
+                        'nickel': 0,
+                        'penny': 0} 
+
+        if rem != Decimal('0.00'):       
+            change = calculate_minimum_denominations(change)
+            change = sum_final_change(change, DENOMINATIONS_)
+            change = final_change_output(change)
+            print(change)
+            print()
+        else:        
+            change = calculate_random_denominations(change)
+            change = sum_final_change(change, DENOMINATIONS_)
+            change = final_change_output(change)
+            print(change)
+            print()
+        DENOMINATIONS_ = DENOMINATIONS_.fromkeys(DENOMINATIONS_, 0)
+
+
+if __name__ == "__main__":
+    main()

tests/test_cash_register.py

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+import os, pytest, sys
+from decimal import Decimal
+
+myPath = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, myPath + '/../')
+
+from register import cash_register
+
+#two complete, add more
+def test_sum_final_change_return_type():
+    DENOMINATIONS_ = {'dollar': 0,
+                'quarter': 0,
+                'dime': 0,
+                'nickel': 0,
+                'penny': 0}
+    change = ['quarter', 'dime', 'penny']
+    final_change = cash_register.sum_final_change(change, DENOMINATIONS_)
+    assert type(final_change) is dict
+
+
+def test_sum_final_change_empty_input():
+    DENOMINATIONS_ = {'dollar': 0,
+                'quarter': 0,
+                'dime': 0,
+                'nickel': 0,
+                'penny': 0}
+    change = ['quarter', 'dime', 'penny']
+    final_change = cash_register.sum_final_change(change, DENOMINATIONS_)
+    assert DENOMINATIONS_['quarter'] == 1
+
+
+def test_calculate_minimum_denominations_change_is_decimal():
+    change = 0.01
+    with pytest.raises(TypeError):
+        cash_register.calculate_minimum_denominations(change)
+
+
+def test_calculate_minimum_denominations_return_not_empty():
+    change = Decimal('1.11')
+    change = cash_register.calculate_minimum_denominations(change)
+    assert print(len(change)) != 0
+
+
+def test_calculate_random_denominations_change_is_decimal():
+    change = 0.01
+    with pytest.raises(TypeError):
+        cash_register.calculate_random_denominations(change)
+
+
+def test_calculate_random_denominations_return_not_empty():
+    change = Decimal('1.11')
+    change = cash_register.calculate_minimum_denominations(change)
+    assert print(len(change)) != 0
+
+
+def test_final_change_output_return_str():
+    change = {'dollar': 0, 'quarter': 4, 'dime': 4, 'nickel': 4, 'penny': 8}
+    output = cash_register.final_change_output(change)
+    assert type(output) is str
+
+
+def test_final_change_input_dict():
+    change = ['sting1', 'string2', 'string3']
+    with pytest.raises(TypeError):
+        cash_register.final_change_output(change)
+
+
+def test_final_change_output_not_empty():
+    change = {'dollar': 0, 'quarter': 4, 'dime': 4, 'nickel': 4, 'penny': 8}
+    output = cash_register.final_change_output(change)
+    assert len(output) > 0

tests/test_data.csv

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+4.89,10.00
+3.33,10.00
+2.66,5.00
+2.64,5.00
+abcd,efgh