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

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

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In python strings are ordered lexicographically.

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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

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

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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).