Python string formatting [duplicate]

Question

This question already has answers here:

How do I put a variable’s value inside a string (interpolate it into the string)? (9 answers)

Closed 1 year ago.

I see you guys using

url = '"%s"' % url # This part
>>> url = "http://www.site.com/info.xx"
>>> print url
http://www.site.com/info.xx
>>> url = '"%s"' % url
>>> print url
"http://www.site.com/info.xx"

Is it advanced Python? Is there a tutorial for it? How can I learn about it?

• Anti Earth: You've marked both questions as duplicates. Surely you'd mark only the latter (chronologically)
• thumbtackthief: No, it's like twins. Both should be destroyed.

Answer 1

It's common string formatting, and very useful. It's analogous to C-style printf formatting. See String Formatting Operations in the Python.org docs. You can use multiple arguments like this:

"%3d\t%s" % (42, "the answer to ...")

• Janusz Lenar: The real answer is 43 but don't tell anyone.
• AWE: @Janusz Lenar blasphemy, I will not flag you this time but big brother is keeping an eye on you now.
• Sandeep Singh Rawat: Url is broken => Correct Url docs.python.org/3/library/string.html#formatstrings

Answer 2

That line of code is using Python string formatting. You can read up more on how to use it here: http://docs.python.org/library/stdtypes.html#string-formatting

Answer 3

It is not advanced, you can use ' or " to define a string.

Check the documentation.