python FileError

 >>> ls1=["nihia"]
 >>> ls1
 ['nihia']
 >>> ls1.pop()
 'nihia'
 >>> ls1.append("sssss")
 >>> ls1
 ['sssss']
 >>> assert len(ls1)>0
 >>> ls1.pop()
 'sssss'
 >>> assert len(ls1)>0

 Traceback (most recent call last):
   File "<pyshell#38>", line 1, in <module>
     assert len(ls1)>0
 AssertionError
 >>>
 >>> ls1.fishc

 Traceback (most recent call last):
   File "<pyshell#40>", line 1, in <module>
     ls1.fishc
 AttributeError: 'list' object has no attribute 'fishc'
 >>>
 >>> ms1[3]

 Traceback (most recent call last):
   File "<pyshell#42>", line 1, in <module>
     ms1[3]
 NameError: name 'ms1' is not defined
 >>> ls1[3]

 Traceback (most recent call last):
   File "<pyshell#43>", line 1, in <module>
     ls1[3]
 IndexError: list index out of range
 >>>
 >>> dict1={'one':1 ,'two':2}
 >>> dict1['one']
 1
 >>> dict1['four']

 Traceback (most recent call last):
   File "<pyshell#47>", line 1, in <module>
     dict1['four']
 KeyError: 'four'
 >>> dixt1.get('four')

 Traceback (most recent call last):
   File "<pyshell#48>", line 1, in <module>
     dixt1.get('four')
 NameError: name 'dixt1' is not defined
 >>> dict1.get('four')
 >>> dict1.get('two')
 2
 >>> 1+''

 Traceback (most recent call last):
   File "<pyshell#51>", line 1, in <module>
     1+''
 TypeError: unsupported operand type(s) for +: 'int' and 'str'
 >>> 5/0

 Traceback (most recent call last):
   File "<pyshell#52>", line 1, in <module>
     5/0
 ZeroDivisionError: integer division or modulo by zero
 >>>
 >>>
 >>>
 >>>
 >>> ================================ RESTART ================================
 >>> 

 Traceback (most recent call last):
   File "/tmp/guest-WX48w4/文档/py1.py", line 2, in <module>
     file_name=open('myname')
 IOError: [Errno 2] No such file or directory: 'myname'
 >>> ================================ RESTART ================================
 >>> 

 Traceback (most recent call last):
   File "/tmp/guest-WX48w4/文档/py1.py", line 2, in <module>
     file_name=open('myname.txt')
 IOError: [Errno 2] No such file or directory: 'myname.txt'
 >>> ================================ RESTART ================================
 >>>
 wrong
 [Errno 2] No such file or directory: 'myname.txt'
 >>> ================================ RESTART ================================
 >>>
 wrong
 [Errno 2] No such file or directory: 'myname.txt'
 >>> ================================ RESTART ================================
 >>> 

 Traceback (most recent call last):
   File "/tmp/guest-WX48w4/文档/py1.py", line 2, in <module>
     name=a+''
 NameError: name 'a' is not defined
 >>> ================================ RESTART ================================
 >>>
 wrong
 unsupported operand type(s) for +: 'int' and 'str'
 >>> ================================ RESTART ================================
 >>> 

 Traceback (most recent call last):
   File "/tmp/guest-WX48w4/文档/py1.py", line 2, in <module>
     int ('abc')
 ValueError: invalid literal for int() with base 10: 'abc'
 >>> ================================ RESTART ================================
 >>> 

 Traceback (most recent call last):
   File "/tmp/guest-WX48w4/文档/py1.py", line 5, in <module>
     print (file_name.read())
 NameError: name 'file_name' is not defined
 >>> 1/0

 Traceback (most recent call last):
   File "<pyshell#57>", line 1, in <module>
     1/0
 ZeroDivisionError: integer division or modulo by zero
 >>> raise 1/0

 Traceback (most recent call last):
   File "<pyshell#58>", line 1, in <module>
     raise 1/0
 ZeroDivisionError: integer division or modulo by zero
 >>> 

 try:
     int ('')
     #name=1+'1'
     #file_name=open('myname.txt')
     print (file_name.read())
     file_name.close()
 except IOError as reason:  #eg1
     print ('wrong\n'+str(reason))
 except TypeError as reason:
     print ('wrong\n'+str(reason))
 except:     #eg2
     print ('wrong\n'+str(reason))
 except (TypeError,IOError):     #eg3
     print ('wrong\n'+str(reason))
 finally:    #keep away from not closing the  file
     file_name.close()