Python built-in functions

1,help (i) Help

2,dir (), all variables and built-in variables for the current file

3,vars (), the value of all variables and variables in the current file, and the values of built-in variables and built-in variables

4,type (i), the type of the variable

5,import Temp Import module, the effect of multiple imports is imported only once.

6,reload (temp) can import modules multiple times

7,id (i), shows the memory address of the variable

cmp(2,3)

cmp ( 2 , 2 ) cmp ( 2 , 1 ) cmp ( 10 , 1 ) abs () bool () divmod () max () min () sum () pow ( 2 ,  11 ) - - - - - - - - - - - - - - - - - - len () all () any () - - - - - - - - - - - - - - - - - - chr () ord () hex () oct () bin () - - - - - - - - - - - - - - - - - - print range ( 10 ) print xrange ( 10 ) for i  in xrange ( 10 ):      print i for k,v  in enumerate ([ 1 , 2 , 3 , 4 ]):      print k,v - - - - - - - - - - - - - - - - - - s = ‘i am {0}‘ print s. format ( ‘alex‘ ) str ( 1 ) - - - - - - - - - - - - - - - - - - def Function(arg):      print arg print apply (Function,( ‘aaaa‘ ))  #执行函数 print map ( lambda x:x + 1 ,[ 1 , 2 , 3 ])  #all print filter ( lambda x: x = = 1 ,[ 1 , 23 , 4 ])  #True序列 print reduce ( lambda x,y:x + y,[ 1 , 2 , 3 ])  #累加 x  = [ 1 ,  2 ,  3 ] y  = [ 4 ,  5 ,  6 ] z  = [ 4 ,  5 ,  6 ] print zip (x, y,z) - - - - - - - - - - - - - - - - - - #__import__() #hasattr() #delattr() #getattr() module  = __import__ ( ‘temp‘ ) print dir (module) val  = hasattr (module,  ‘version‘ ) print val - - - - - - - - - - - - - - - - - - #callable()      #函数、类必须要有 __call__ 方法 #compile #eval com  = compile ( ‘1+1‘ ,‘ ‘,‘ eval ‘) print eval (com) #exec语句 code  = "for i in range(0, 10): print i" cmpcode  = compile (code, ‘ ‘, ‘ exec ‘) exec cmpcode code  = "print 1" cmpcode  = compile (code, ‘ ‘, ‘ single‘) exec cmpcode - - - - - - - - - - - - - - - - - - #isinstance() #issubclass() #super() #staticmethod()

Python built-in functions