String formatting codes
Printing several variables in a single string is often easiest to do when you
use the Python string formatting codes. The following table lists all of the
formatting codes:
s 
string conversion (or any object) 
X 
hexadecimal integer (uppercase letters) 
c 
character 
e 
exponential notation (with lowercase 'e') 
d 
signed decimal integer 
E 
exponential notation (with uppercase 'E') 
i 
integer 
f 
floating point real number 
u 
unsigned decimal integer 
g 
the shorter of %f and %e 
o 
octal integer 
G 
the shorter of %f and %E 
x 
hexadecimal integer (lowercase letters) 
% 
literal '%' 
You can modify the output further by adding to the basic codes.
Symbol 
Function 
 
left justify 
m.n 
m is the minimum total width and n is the number of
decimal digits to display (answer is rounded). 
(var) 
maps a variable from a dictionary 
Sample code
>>> import math
>>> math.pi
3.1415926535897931
>>> print '%s' % math.pi
3.14159265359
>>> print '%f' % math.pi
3.141593
>>> print '%.2f' % math.pi
3.14
>>> print '%10.2f' % math.pi
3.14
>>> print '%e' % 300000000
3.000000e+008
>>> name = "Bob"
>>> age = 16
>>> print "My name is %s and I'm %s years old." % (name, age)
My name is Bob and I'm 16 years old.
>>> print "Name: %s Age: %s" % (name, age)
Name: Bob Age: 16
>>> print "Name: %10s Age: %s" % (name, age)
Name: Bob Age: 16
>>> print "Name: %10s Age: %s" % (name, age)
Name: Bob Age: 16
>>> print "My name is %(name)s and I'm %(age)d years old." % \
{'name': 'Bob', 'age': 16}
My name is Bob and I'm 16 years old.
