Parameter transfer of Python function and detailed explanation of variable scope
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1. Pass multiple parameters
Use the * sign to indicate that the function accepts multiple arguments
> def f (* args): print args > f (1) (1,) > > f (1) (1,) > f (1) (1) (1)
two。 Pass dictionary parameters
Use the * * sign to indicate that the dictionary parameter is passed
> def F1 (* * args): print args > F1 (axi1moving baccalaure2) {'aqu: 1, 'baked: 2}
3. Pass the function name as an argument
# coding=utf-8 # is used to support Chinese characters. There can be no spaces before and after the = sign. # minmax.py def minmax (test,*args): res=args [0] for arg in args [1:]: # copy of the content in the circular args if test (arg,res): res=arg return res def lessthan (xMagery): return xy print minmax (lessthan,4,7,9,22,2,18) print minmax (grtrthan,4,7,9,22,2,18)
4. Transfer mixing parameters
> def f2 (print pargs: 12) > > f2 (1, 2, 3, 4, 5, 5, 11, 5) 1 (2, 3, 4, 4) {'Yee: 12,' x, 4: 11}
5. Exercise-string ∪ and ∩ operations
> > def intersct (* args): res= [] for x in args [0]: for other in args [1:]: if x not in other:break else:res.append (x) return res > def union (* args): res= [] for seq in args: for x in seq: if not x in res: res.append (x) return res > s1Magne s2if not x in res s3 = "SPAM", "SCAM", "SLAM" > > intersct (s1PhoneS2) ['showing,' Aging,'M'] > > union (S1) S2) ['Sparks,' Packers, 'Aids,' Mises,'C']
6. Class member variables and instance variables
> class C: X = 33 def m (self): X = 44 self.X = 55 > obj = C () > print obj.X 33 > obj.m () > > print obj.X 55 > C.X 33
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