CODEWITHSUNDEEP
python
Raqeeb Alam
Raqeeb Alam

Reputation: 35

ValueError: unsupported format character ')' (0x29) at index 21

I got the code from Automate The Boring Stuff With Python.

import logging
logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s(levelname)s- %(message)s')
logging.debug('Start of program')

def factorial(n):
    logging.debug('Start of factorial( %)' % (n))
    total = 1
    for i in range(n + 1):
        total *= i
        logging.debug('i is ' + str(i) + ', total is ' + str(total))
    logging.debug('End of factorial( %)' % (n))
    return total

print (factorial(5))
logging.debug('End of program')

When I run the code, the following error occurs:

2015-06-18 12:51:47,073 - DEBUG- Start of program Traceback (most recent call last): File "/home/raqeeb.alam/PycharmProjects/E_mail/sub_links.py", line 14, in print factorial(5) File "/home/raqeeb.alam/PycharmProjects/E_mail/sub_links.py", line 6, in factorial logging.debug('Start of factorial( %)' % (n)) ValueError: unsupported format character ')' (0x29) at index 21

For these lines:

print (factorial(5))
logging.debug('End of program')

Upvotes: 1

Views: 12975

Answers (4)

Jalil Nourmohammadi Khiarak
Jalil Nourmohammadi Khiarak

Reputation: 818

This is a generally unsupported error. Try this:

It looks like Python is interpreting the % as a printf-like format character. Try using %%

means:

 logging.debug('Start of factorial( %%)' % (n))

.

.

.

 logging.debug('End of factorial( %%)' % (n))

To have more clean code try to remove () around n.

means:

 logging.debug('Start of factorial( %%)' % n)

.

.

.

 logging.debug('End of factorial( %%)' % n)

Upvotes: 0

Delimitry
Delimitry

Reputation: 3027

Should be: 

logging.debug('Start of factorial(%s)' % (n))
...
logging.debug('End of factorial(%s)' % (n))

BTW: parentheses are redundant here. Could be simply:

logging.debug('Start of factorial(%s)' % n)
...
logging.debug('End of factorial(%s)' % n)

And ' %(asctime)s(levelname)s- %(message)s' should be ' %(asctime)s%(levelname)s- %(message)s'

Upvotes: 3

poke
poke

Reputation: 388143

logging.debug('Start of factorial( %)' % (n))
logging.debug('End of factorial( %)' % (n))

Those two lines should be

logging.debug('Start of factorial(%s)' % (n))
logging.debug('End of factorial(%s)' % (n))

Upvotes: 2

Daniel Roseman
Daniel Roseman

Reputation: 599866

You're missing a % sign:

logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s%(levelname)s- %(message)s')
#                                                            ^ HERE

Upvotes: 2

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