Menu
Consider this try/except block I use for checking error message stored in e.
e
queryString = "SELECT * FROM benchmark WHERE NOC = 2"
try:
res = db.query(queryString)
except SQLiteError, e:
# `e` has the error info
print `e`
The e object here contains nothing more than the above string. When python reports an unhandled error, however, it shows a pretty detailed info as below:
Traceback (most recent call last):
File "fool.py", line 1, in
open("abc.zyz", "r")
IOError: [Errno 2] No such file or directory: 'abc.zyz'
My question is, how can I get the information such as above (the file and the line number etc.)? Or, if e contains this info, how is it stored inside it?
862
As a Python developer you can choose to throw an exception if a condition occurs. To throw (or raise) an exception, use the raise keyword.
The reason to use try/except is when you have a code block to execute that will sometimes run correctly and sometimes not, depending on conditions you can't foresee at the time you're writing the code.
Catching Exceptions in Python In Python, exceptions can be handled using a try statement. The critical operation which can raise an exception is placed inside the try clause. The code that handles the exceptions is written in the except clause.
To resolve the ValueError in Python code, a try-except block can be used. The lines of code that can throw the ValueError should be placed in the try block, and the except block can catch and handle the error.
This will show the trace to the error.
import traceback
try:
res = db.query(queryString)
except SQLiteError, e:
# `e` has the error info
print `e`
for tb in traceback.format_tb(sys.exc_info()[2]):
print tb
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
