#!/usr/bin/env python
# coding: utf-8

# # Basic exception handling

# In[1]:


class Calc:
    def Inverse(self, num):
        return 1/num

try:
    cal = Calc()
    cal.Inverse(0)
except Exception as err:
    print("An exception has occurred")


# # Handling specific exceptions

# ### The exception in below example will be caught by first except block

# In[2]:


try:
    cal = Calc()
    cal.Inverse(0)
except ZeroDivisionError as zeroDivideError:
    print("A zero division exception has occurred. Exception message -", zeroDivideError)
except Exception as err:
    print("An exception has occurred -", err)


# ### The exception in below example will be caught by second except block

# In[3]:


try:
    cal = Calc("")
    cal.Inverse(0)
except ZeroDivisionError as zeroDivideError:
    print("A zero division exception has occurred. Exception message -", zeroDivideError)
except Exception as err:
    print("An exception has occurred -", err)


# # Raising an exception

# In[4]:


class Student:
    def setAge(self, age):
        if(age < 18):
            raise Exception("Age can not be less than 18")
        else:
            self.age = age

alice = Student()
try:
    alice.setAge(15)
except Exception as error:
    print("An exception has occurred -", error)


# # The else and finally block

# ### The else block

# In[6]:


bob = Student()
try:
    bob.setAge(20)
except Exception as error:
    print("An exception has occurred -", error)
else:
    print("Age was assigned successfully!")


# ### The finally block

# In[7]:


bob = Student()
try:
    bob.setAge(20)
except Exception as error:
    print("An exception has occurred -", error)
else:
    print("Age was assigned successfully!")
finally:
    print("Finally block - This always gets executed")


# # User defined exceptions

# In[8]:


class SalaryError(Exception):
    def __init__(self, arg):
        self.arg = arg

class Employee:
    def setSalary(self, salary):
        if(salary < 0):
            raise SalaryError("Salary can't be less than 0")
        else:
            self.salary = salary

try:
    chris = Employee()
    chris.setSalary(-100)
except SalaryError as error:
    print("Salary exception occurred - ", error)