In [1]:

def foo():
    assert 1 == 2

In [2]:

def bar():
    foo()

In [3]:

def baz():
    bar()

In [4]:

baz()

---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
Input In [4], in <cell line: 1>()
----> 1 baz()

Input In [3], in baz()
      1 def baz():
----> 2     bar()

Input In [2], in bar()
      1 def bar():
----> 2     foo()

Input In [1], in foo()
      1 def foo():
----> 2     assert 1 == 2

AssertionError:

In [6]:

def err1(x):
    return 8/x

In [7]:

err1(0)

---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
Input In [7], in <cell line: 1>()
----> 1 err1(0)

Input In [6], in err1(x)
      1 def err1(x):
----> 2     return 8/x

ZeroDivisionError: division by zero

In [8]:

d = { "Jenny":8675309}

In [9]:

d['Mattox']

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
Input In [9], in <cell line: 1>()
----> 1 d['Mattox']

KeyError: 'Mattox'

In [10]:

mylist = [2,3,4,5]

In [11]:

mylist[10]

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
Input In [11], in <cell line: 1>()
----> 1 mylist[10]

IndexError: list index out of range

In [12]:

'Mattox' in d

Out[12]:

False

In [13]:

mylist['hi']

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Input In [13], in <cell line: 1>()
----> 1 mylist['hi']

TypeError: list indices must be integers or slices, not str

In [15]:

i = int(input("Give me an index: "))
mylist[i]

Give me an index: 999

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
Input In [15], in <cell line: 2>()
      1 i = int(input("Give me an index: "))
----> 2 mylist[i]

IndexError: list index out of range

In [16]:

def safeLookup():
    try:
        i = int(input("Give me an index: "))
        return mylist[i]
    except:
        print("Ug.  Something went wrong.")

In [17]:

safeLookup()

Give me an index: 10
Ug.  Something went wrong.

In [18]:

safeLookup()

Give me an index: 3

Out[18]:

In [28]:

def safeLookup():
    try:
        i = int(input("Give me an index: "))
        return mylist[i]
    except IndexError:
        print("It needs to be from 0 to 3")
    except ValueError:
        print("Please stick with integers.")
    except Exception as e:
        print("Ug.  Something went wrong.")
        print(e)

In [29]:

safeLookup()

Give me an index: 234
It needs to be from 0 to 3

In [30]:

class BadDay(Exception):
    pass

In [31]:

def howAreYou():
    d = input("What day is it? ")
    if d=='Monday':
        raise BadDay
    else:
        print("Good day!")

In [32]:

howAreYou()

What day is it? Monday

---------------------------------------------------------------------------
BadDay                                    Traceback (most recent call last)
Input In [32], in <cell line: 1>()
----> 1 howAreYou()

Input In [31], in howAreYou()
      2 d = input("What day is it? ")
      3 if d=='Monday':
----> 4     raise BadDay
      5 else:
      6     print("Good day!")

BadDay:

In [ ]: