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Built-in Exceptions in Python

Built-in Exceptions

Some of the python built-in exceptions are illustrated in below.

1.SyntaxError

Raised whenever it detects an error in python syntax.

Ex

>>> if x+5

SyntaxError: invalid syntax

>>> print “hi”

SyntaxError: Missing parentheses in call to ‘print’

>>> if:

 

SyntaxError: invalid syntax

>>> for:

 

SyntaxError: invalid syntax

>>> print x

SyntaxError: Missing parentheses in call to ‘print’

>>> for x:

 

SyntaxError: invalid syntax

>>> print(“hi”,”hello”+)

SyntaxError: invalid syntax

2. ZeroDivisionError

It raises during the division/modulo of a number with zero.

Ex

>>> 1/0

Traceback (most recent call last):

File “<pyshell#10>”, line 1, in <module>

1/0

ZeroDivisionError: division by zero

>>> p=1

>>> q=0

>>> p/q

Traceback (most recent call last):

File “<pyshell#13>”, line 1, in <module>

p/q

ZeroDivisionError: division by zero

>>> 1.2/0

Traceback (most recent call last):

File “<pyshell#14>”, line 1, in <module>

1.2/0

ZeroDivisionError: float division by zero

3.NameError

This rises when an identifier is not found in local or global spaces.

Ex

>>> for p in items( ):

print(p)

 

 

Traceback (most recent call last):

File “<pyshell#2>”, line 1, in <module>

for p in items():

NameError: name ‘items’ is not defined

>>> print(a)

Traceback (most recent call last):

File “<pyshell#3>”, line 1, in <module>

print(a)

NameError: name ‘a’ is not defined

>>> tup(10)

Traceback (most recent call last):

File “<pyshell#4>”, line 1, in <module>

tup(10)

NameError: name ‘tup’ is not defined

>>> math.module

Traceback (most recent call last):

File “<pyshell#9>”, line 1, in <module>

math.module

NameError: name ‘math’ is not defined

>>> os.dir( )

Traceback (most recent call last):

File “<pyshell#10>”, line 1, in <module>

os.dir( )

NameError: name ‘os’ is not defined

>>> assert sqrt(-64)

Traceback (most recent call last):

File “<pyshell#6>”, line 1, in <module>

assert sqrt(-64)

NameError: name ‘sqrt’ is not defined

4.ValueError

Raised when the built-in function for a specific data type has the valid type of arguments, but the arguments have invalid values specified.

Ex:

>>> var=float(input(“Number:”))

Number: sudha

Traceback (most recent call last):

File “<pyshell#0>”, line 1, in <module>

var=float(input(“Number:”))

ValueError: could not convert string to float: ‘ sudha’

>>> k=int(“Enter a string:”)

Traceback (most recent call last):

File “<pyshell#1>”, line 1, in <module>

k=int(“Enter a string:”)

ValueError: invalid literal for int( ) with base 10: ‘Enter a string:’

5.TypeError

Raised when an invalid operation or function is attempted. It means attempting an operation which is not valid for a specified data type.

Ex

>>> “12.4”+5

Traceback (most recent call last):

File “<pyshell#1>”, line 1, in <module>

“12.4”+5

TypeError: Can’t convert ‘int’ object to str implicitly

>>> str+”4″

Traceback (most recent call last):

File “<pyshell#2>”, line 1, in <module>

str+”4″

TypeError: unsupported operand type(s) for +: ‘type’ and ‘str’

>>> int*4

Traceback (most recent call last):

File “<pyshell#3>”, line 1, in <module>

int*4

TypeError: unsupported operand type(s) for *: ‘type’ and ‘int’

>>> dict={1}

>>> dict[2]

Traceback (most recent call last):

File “<pyshell#7>”, line 1, in <module>

dict[2]

TypeError: ‘set’ object does not support indexing.

>>> d={13,78,98}

>>> d.add( )

Traceback (most recent call last):

File “<pyshell#6>”, line 1, in <module>

d.add( )

TypeError: add( ) takes exactly one argument (0 given)

>>> y(1)

Traceback (most recent call last):

File “<pyshell#4>”, line 1, in <module>

y(1)

TypeError: ‘tuple’ object is not callable

6.IndexError

Raised when an index is not found in a sequence.

Ex:

>>> list=[2.4,5,7]

>>> list[5]

Traceback (most recent call last):

File “<pyshell#5>”, line 1, in <module>

list[5]

IndexError: list index out of range

>>> list=[0,2,4,6]

>>> list.append(45)

>>> list[9]

Traceback (most recent call last):

File “<pyshell#21>”, line 1, in <module>

list[9]

IndexError: list index out of range

>>> list=[“”]

>>> list[-3]

Traceback (most recent call last):

File “<pyshell#14>”, line 1, in <module>

list[-3]

IndexError: list index out of range

7.AttributeError

Raised in case of failure of attribute reference or assignment.

Ex

>>> dict={1}

>>> dict.keys( )

Traceback (most recent call last):

File “<pyshell#17>”, line 1, in <module>

dict.keys( )

AttributeError: ‘set’ object has no attribute ‘keys’

>>> dict.values( )

Traceback (most recent call last):

File “<pyshell#18>”, line 1, in <module>

dict.values( )

AttributeError: ‘set’ object has no attribute ‘values’

>>> y=1,2

>>> y.one

Traceback (most recent call last):

File “<pyshell#3>”, line 1, in <module>

y.one

AttributeError: ‘tuple’ object has no attribute ‘one’

8.AssertionError

Raised when an Assert statement fails.

Ex:

>>> assert( )

Traceback (most recent call last):

File “<pyshell#2>”, line 1, in <module>

assert( )

AssertionError

>>> s=9

>>> assert s>9

Traceback (most recent call last):

File “<pyshell#4>”, line 1, in <module>

assert s>9

AssertionError

9.ImportError

Raised when an import statement fails.

Ex

>>> import error

Traceback (most recent call last):

File “<pyshell#7>”, line 1, in <module>

import error

ImportError: No module named ‘error’

>>> import module

Traceback (most recent call last):

File “<pyshell#8>”, line 1, in <module>

import module

ImportError: No module named ‘module’

>>> import os.module

Traceback (most recent call last):

File “<pyshell#9>”, line 1, in <module>

import os.module

ImportError: No module named ‘os.module’; ‘os’ is not a package

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