print and % operator
jmeile at hotmail.com
Thu Sep 9 09:44:01 CEST 2004
> I am new to Python, so this may be a very simple question for most of
> you. What does the % operator stand for in Python?
It is an operator for formating strings. Ie: lets say you want to print
a string followed by an integer value embebbed on a string, then you
print "String: %s value: %i" % (myStr, value)
This will print:
String: Test value: 10
You could do the same by concatenating the strings:
print "String: " + myStr + "value: " + str(value)
However, the first piece of code is easier to understand and faster.
This link may help:
>I came across a
> script that uses the % operator as follows -
> def sync(delf,name):
> os.popen3( 'P4 -s sync -f %s' % name)
> I would suspect that this just replaces the %s with the value of name.
> Is % before name required?
Yes, % is required since you included "%s" on the string, so, you have
to match it with some variable/constant. If you use "%i" instead, then
you will have to use an int variable/constant.
>Should there be a space between % and name?
No, you could use:
os.popen3( 'P4 -s sync -f %s'%name)
but it looks ugly and it's difficult to read.
> On a similar note, how can I print the value of name using the print
> statement? Should print %name print the value of name?
No, if you want to print a variable directly you should use:
if you want to print it inside a string then you should do:
print "This is the value of name: %s" % name
> Most of the time, when I add some print statements to my script I get
> Autoindent error. Can someone tell me what this error is and how to
> fix it?
Indentation may be wrong, check if you are using the same number of
tabs/spaces on each indentation level.
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