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+--- Thread: What are % and %s? (/thread-4497.html)
What are % and %s? - Pedroski55 - Aug-21-2017
I am just a beginner. I am slowly working my way through 'How to Automate the Boring Stuff' by Al Sweigart
In the code below, I can't see what the %s is, or %
The code works ok, to my amazement, I'd just like to know why in quizFile = open('capitalsquiz%s.txt' % (quizNum + 1), 'w') quizNum is %s from the loop in the text part, because it correctly creates capitalsquiz1.txt and so on. How does this work? Why write %s? What is %? I understand (quizNum + 1), because range begins at 0.
As far as I know, python has % as modulo like 22 % 8 = 6
# Generate 35 quiz files.
for quizNum in range(35):
# Create the quiz and answer key files.
quizFile = open('capitalsquiz%s.txt' % (quizNum + 1), 'w')
answerKeyFile = open('capitalsquiz_answers%s.txt' % (quizNum + 1), 'w')
RE: What are % and %s? - snippsat - Aug-21-2017
for quiz_num in range(2):
print("The old way,don't use it' <%s>" % quiz_num)
for quiz_num in range(2):
print('A newer way format(),ten year old comes out with 2.6 <{}>'.format(quiz_num))
for quiz_num in range(2):
print(f'The new way f-string 3.6 <{quiz_num}>')Output:The old way,don't use it' <0>
The old way,don't use it' <1>
A newer way format(),ten year old comes out with 2.6 <0>
A newer way format(),ten year old comes out with 2.6 <1>
The new way f-string 3.6 <0>
The new way f-string 3.6 <1>RE: What are % and %s? - Kebap - Aug-22-2017
No this is not modulo. This is "string formatting" and the best way to use variable contents in a string template.
Why write it like this? So you do not do the even older way (don't use it) of combining template and variables in a completely unreadable manner like many beginners first do (because they don't know this advanced string formatting)
world = 'Poland'
today = 'Tuesday, 23. August'
print('Hello ' + world + '! How are you ' + today + '?')
RE: What are % and %s? - andre - Aug-22-2017
(Aug-21-2017, 10:03 AM)Pedroski55 Wrote: I am just a beginner. I am slowly working my way through 'How to Automate the Boring Stuff' by Al Sweigart
In the code below, I can't see what the %s is, or %
Hey! I am just a beginner too, but i started out with going through this neat beginnersguide:
learnpythonthehardway.org/book/
This tutorial goes very nicely through things like this, and I went on to learn more python alot faster than I would have if I didn't start here :)
Good luck!
- andre
RE: What are % and %s? - Kebap - Aug-22-2017
Hi andre, welcome to Python!
If you like neat guides, check our recommendations of free Python ressources
The book you mentioned is a bit disputed, as it teaches some controversial habits while leaving out other important concepts alltogether.
Glad it helped you start though :)
RE: What are % and %s? - andre - Aug-22-2017
Hi Kebap
This is all new to me, thank you so much for the enlightenment! :)