what is the usefulness of '>' in python

print 'xxx' > 'ssaw开发者_运维问答w'

it print 'true'

who can give me a clear example .

thanks

Just like in math, > compares two operands and returns True if the left operand is greater than the right, otherwise False.

In python strings are ordered lexicographically.

you can test it out on the interpreter

>>> 'xxx'>'yyy'  #first character 'x' is less than first character 'y', so false
False
>>> 'xxx'>'xyy' 
False
>>> 'xyy'>'xyx' #3rd character 'y' is greater than 3rd character 'x', so true
True

to order strings syntactically (e.g. alphabetically).

It can do y>x>z as a nicer way to say y>x and x>z.

As others have mentioned its a simple greater-than comparison (in your case for strings).