Answer to Question #119223 in Python for Panda

Question

Describe how catching exceptions can help with file errors. Write three Python examples that actually generate file errors on your computer and catch the errors with try: except: blocks. Include the code and output for each example in your post.

Answer 1

Example 1:

a=10

b=0

try:

    #trying to divide a by b

    print(a/b)

    #his should cause an exception since the value of b is 0

except ZeroDivisionError:

    print('Cannot divide by zero')

Output:

Cannot divide by zero

#----------------------------------------------------------------------------------------------------------------------------------------------------

Example 2:

numbers=[2,3,4,None,5,6]

 #looping through numbers list

for i in range(len(numbers)):

    #starting try block

    try:

        #squaring each number

        numbers[i]=numbers[i]**2

    except TypeError:

        #some non numeric data value found in list, which caused

        #exception when trying to square

        print('Non numeric value found, ignoring')

print(numbers) # should be [4, 9, 16, None, 25, 36]

Output:

Non numeric value found, ignoring

[4, 9, 16, None, 25, 36]

#-----------------------------------------------------------------------------------------------------------------------------------------------------

Example 3:

#creating a dictionary

names_ages=dict()

# adding some key and value pairs

names_ages['alex']=25

names_ages['bayson']=24

names_ages['charles']=29

#creating a list of names

names=['alex','bobby','charles','derik']

#looping through list

for i in names:

    #starting try block

    try:

        #displaying value corresponding to the key value i

        print(i,names_ages[i])

    except KeyError:

        #i does not exist on names_ages dict

        print(i,'is an invalid key!')

Output:

alex 25

bobby is an invalid key!

charles 29

derik is an invalid key!