python question Complete following function according to the specification in th

Question

python question

Complete following function according to the specification in the documentation string. You will need to create your own custom exceptions for these functions. # Write your answers here. Define Change ParameterError and ChangeRemainderError in this code cell as well. def changel (a, d): Computes the change of amount a given denominations d. Parameter a must be of type int, d must be of type list of int, and the elements of d must be in ascending order, otherwise ChangeParameterError is raised. The result is a dictionary with keys from d, mapping to values of the number of coins / bills of each denomination. This is computed by first taking the maximal number of coins / bill of the highest denomination, then the next highest, etc. If no exact change is possible, ChangeRemainderError is raised. return change( 3, [3, 7]) == {3: 1, 7:0} change(15, [1, 3, 7]) == {1: 1, 3: 0, 7: 2} try: change (True, [4]) # raises ChangeParameterError except ChangeParameterError: print("Successful test case") try: change (3, 7) # raises ChangeParameterError except ChangeParameterError: print("Successful test case"). try: change (3, (7, True]) # raises Change ParameterError except ChangeParameterError: print("Successful test case"). try: change (3, [7, 3]) # raises ChangeParameterError except ChangeParameterError: print("Successful test case") try: change (3, [2, 7]) # raises ChangeRemainderError except ChangeRemainderError: print("Successful test case")

Explanation / Answer

class changeparametererror(Exception):

def __init__(self,e):

self.e = e

if self.e != self.e.sort():

print "error"

if all(isinstance(item, int) for item in self.e):

print "error"

class changeremaindererror(Exception):

def __init__(self,e):

self.e = e

if all(value == 0 for value in self.e.values()):

print "error"

def change(a,d):

b = {}

k = len(d)

while k > 0:

b[d[k-1]] = a // d[k-1]

a = a % d[k-1]

k = k-1

return b

a = [1,2,3]

try:

fin = change(17,a)

except changeparametererror,a:

print "Successful test case"  

except changeremaindererror , fin:

print "Successful test case"

print fin

I am not able to get the exception correctly but the logic applied above is correct try to work aroud th syntax for exception in the above code

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