Function parameters in python include: default parameters, keyword parameters, non-keyword variable-length parameters (tuple), keyword variable-length parameters (dictionary)
：在函数声明时，指定形参的默认值，调用时可不传入改参数（使用默认值） def foo(x): ##默认参数 print 'x is %s' % x
y默认为20 def foo( x,y=20): ##关键字参数
*z接收一个元组
<em><em><em> for myz in<strong> z</strong>:<br><em> print 'z: ', myz</em></em></em></em>
关键字可变长参数（字典）:**w接收的是一个字典
def foo(x，y=20,*z，**w): ##默认参数
for wArg in w.keys(): print 'wArg %s: %s' % (wArg, str(w[wArg]))
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