Default substituting %s in python scripts

python string substitution
prahallada picture prahallada · May 10, 2011 · Viewed 92.8k times · Source

Sometimes in Python scripts I see lines like:

cmd = "%s/%s_tb -cm cond+line+fsm -ucli -do \"%s\""

Where is the %s in the above line substituted? Does Python have some stack of strings and it pops them and replaces %s?

Answer

John Gaines Jr. picture John Gaines Jr. · May 10, 2011

That would be later used in something like:

print cmd % ('foo','boo','bar')

What you're seeing is just a string assignment with fields in it which will later be filled in.

Related questions

Remove all newlines from inside a string

I'm trying to remove all newline characters from a string. I've read up on how to do it, but it seems that I for some reason am unable to do so. Here is step by step what I am doing: …

Read More
how to substitute part of a string in python?

How to replace a set of characters inside another string in Python? Here is what I'm trying to do: let's say I have a string 'abcdefghijkl' and want to replace the 2-d from the end symbol (k) with A. I'm …

Read More
Does Python have a string 'contains' substring method?

I'm looking for a string.contains or string.indexof method in Python. I want to do: if not somestring.contains("blah"): continue

Read More