python核心编程学习（六）

一个函数传参数的例子：

'''
Created on 2012-3-8

@author: Administrator
'''
#!/usr/bin/env python
def testit(func,*nkwargs,**kwargs):
try:
retval = func(*nkwargs,**kwargs)
result = (True,retval)
except Exception,diag:
result = (False,str(diag))
return result

def test():
funcs = (int,long,float)
vals=(1234,12.34,'1234','12.34')

for eachFunc in funcs:
print '-'*20
for eachVal in vals:
retval = testit(eachFunc,eachVal)
if retval[0]:
print '%s(%s)=' % (eachFunc.__name__,eachVal), retval[1]
else:
print '%s(%s)=FAILED:' % (eachFunc.__name__,eachVal), retval[1]

if __name__=='__main__':
test()

运行结果如下：

--------------------
int(1234)= 1234
int(12.34)= 12
int(1234)= 1234
int(12.34)=FAILED: invalid literal for int() with base 10: '12.34'
--------------------
long(1234)= 1234
long(12.34)= 12
long(1234)= 1234
long(12.34)=FAILED: invalid literal for long() with base 10: '12.34'
--------------------
float(1234)= 1234.0
float(12.34)= 12.34
float(1234)= 1234.0
float(12.34)= 12.34

注意如下：

retval = testit(eachFunc,eachVal)每次循环传递int,long,float 三个工厂的函数，retval = func(*nkwargs,**kwargs)每次接收一个数字，默认这个数字赋值的形参为nkwargs。