What is a data type? Storing data in the end to which variable is an integer or a character or decimal etc, although Python does not need to define a variable declared in advance what type of data the time, but when in use or the data type of the points.
Python has five standard data types: digital (numeric), strings, tuples, lists, dictionaries
What is the value type?
Numeric types include: integer, float, boolean
First, the integer:
1) Integer (Int) - often referred to is an integer or an integer, is positive or negative integer, with no decimal.
Python3 is no limit to the size of the integer, can use as Long type, so Python3 no Python2 of Long.
Such as: num01 02 03 04 are integers, num05 is float, decimal only have scientific notation
Integer
2) How to view variables take up much space?
Such as:
**import ** sys
Print ( "num01 space occupied" , sys.getsizeof (num01))
Print ( "num02 space occupied" , sys.getsizeof (num02))
storage
3) Integer common methods:
Function returns a value (to be described)
** abs (x) ** Returns the absolute value, such as abs (-10) returns 10
** math.fabs (x) ** Returns the absolute value, as math.fabs (-10) returned 10.0
** math.sqrt (x) ** returns the square root of the number x.
Math.pow ** (X, Y) X value calculation y. x power of y
** max (x1, x2, ...) ** returned to the maximum value of the given parameter
** min (x1, x2, ...) ** returned to the minimum value of the given parameter
Such as:
Integer common method
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Second, the float
The **: ** float accuracy of 17, over 17 represented in scientific notation
Float
1) float inside round , retains the number after the decimal point position, often used
Such as:
round use
Instead of the standard rounding, there is a rule:
round () If only one number as an argument, when not specified number of digits, returns an integer, and is the nearest integer (similar rounding on this point). However, when there is .5, are the same distance from both sides, round () takes an even closer, which is why the round (2.5) = 2. When the specified number of decimal places of choice when the usage rules are generally rounded, but faced with this situation .5, if you choose the number of digits is odd trees before, directly discarded, the even if the choice up
2) floating-point inside the ceil
ceil use
Ceil Returns the number of the integers, positive and negative numbers differently
3) floor Returns the integer number of homes
Rounded integer
4) modf returns the integer part of X and fractional part, part of the two values meet the same as X, an integer part expressed in floating-point
modf keyword
Return, but the value is not very accurate
Third, Boolean: False True can participate in math
Boolean
All non-integer 0 is true, 0 is False
python data types