Python built-in type

I. Overview of Python built-in types:

(1) Main data types include: Numerics (number), sequences (sequence), ings (ing), classes, instances and exception.

(2) Features: All standard objects can be used for Boolean testing, compared between the same type, and converted to string (using the built-in function repr (obj) or str (obj )).

* Any object can test the true value in an if, while, or Boolean expression. The following values are considered false (others are true ):

* Boolean operator:

* Python has eight comparison operators with the same priority (higher than boolean operators ): <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + pgltzybzcm9 "http://www.bkjia.com/uploadfile/Collfiles/20131223/20131223095211300.jpg" alt = "">

(3) classification of standard types:

* Variable type: Numbers and dictionaries

* Unchangeable types: Numbers, strings, and tuples

2 Numeric (number) type -- int, float, complex

(1) Integers (integer ):

(2) Floating point number (double-precision Floating point type): usually implemented using double in c.

(3) Complex number (plural ):

* Example: comp = 12 + 2j

* Note: The imaginary part must have a suffix j or J.

* You can use *. real to return the real part; *. imag to return the virtual part.

Trisequence Sequence type:

(1) python has six sequence types: strings, list, tuples, range, byte sequences (bytes object), and byte arrays (bytearray objects ).

(2) String

(3) List

(4) tuples

Four Set types:

(1) The set object is an unordered hash object.

(2) There are two built-in set types: set and frozenset.

* Set is a variable set: You can add or delete elements, but not hash elements.

* Frozenset is an unchangeable set: It can be hashed.

Five ing types -- dict:

Six other built-in types: