can any one tell me what indentation
Indentation is how python knows what a "block" is. Blocks are used for things like loops, if/else, function definition, classes, etc. For example:
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for i in range(5): # begin for loop block
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print i # indented (usually 4 spaces, sometimes 1 tab)
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print "hello" # not indented, not in the block above it.
This is one of the coolest features of Python (IMO). No tags, no semi-colon, no parentheses - nothing but the right amount of whitespace.
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