Python

From:http://interactivepython.org/courselib/static/pythonds/Introduction/GettingStartedwithData.html

1. numeric classes 

Python has two main built-in numeric classes that implement the integer and floating point data types.Note that when two integers are divided, the result is a floating point.

　　2. The boolean data type

>>> True
True
>>> False
False
>>> False or True
True
>>> not (False or True)
False
>>> True and True
True

In addition, relational operators and logical operators can be combined together to form complex logical questions.

Operation Name	Operator	Explanation
less than	< <	Less than operator
greater than	> >	Greater than operator
less than or equal	<= <=	Less than or equal to operator
greater than or equal	>= >=	Greater than or equal to operator
equal	== ==	Equality operator
not equal	!= !=	Not equal operator
logical and	and and	Both operands True for result to be True
logical or	or or	One or the other operand is True for the result to be True
logical not	not not	Negates the truth value, False becomes True, True becomes False

　　3. Identifiers

>>> theSum = 0
>>> theSum
0
>>> theSum = theSum + 1
>>> theSum
1
>>> theSum = True
>>> theSum
True