On 2018-07-20 18:59, Ganesh Pal wrote:
Dear python Friends,
I need a quick suggestion on the below code.
def modify_various_line(f):
""" Try modifiying various line """
try:
f.write('0123456789abcdef')
f.seek(5) # Go to the 6th byte in the file
print f.read(1)
f.seek(-3, 2) # Go to the 3rd byte before the end
print f.read(1)
f.write('END')
except IOError as e:
raise
return True
def h():
try:
with open('/tmp/file.txt', 'r+') as f:
try:
modify_various_line(f)
except Exception as e:
print e
except IOError as e:
print(e)
h()
gpal-cwerzvd-1# python ganesh1.py
5
d
gpal-cwerzvd-1# cat /tmp/file.txt
0123456789abcdefEND#
(1) Can we use try and expect in a 'with open' function as shown in the
below example code .
Yes.
(2) If I hit any other exceptions say Value-error can I catch them as
show below
try:
with open('/tmp/file.txt', 'r+') as f:
try:
modify_various_line(f)
value_list = [str(value) for value in somedict.values()]]
except (ValueError,IOError) as e:
print e
except IOError as e:
PS: I don't want to use other way of opening file say file =
open(“testfile.txt”,”w”) and also want to retain modify_various_line(f)
function ,
Yes.
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