str() and repr(): Strings and floating point numbers, have two distinct representations.
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s = 'Hello, world.'
print str(s)
print repr(s)
print str(0.1)
print repr(0.1)
x = 10 * 3.25
y = 200 * 200
s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...'
print s
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