Passing parameters of python functions

In this case, we will discuss the parameter passing problem of the function. The python version I use is 3.3.2 for the function: in this case, we want to discuss the parameter passing problem of the function.

The python version I use is 3.3.2.

For functions:

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Def fun (arg ):

Print (arg)

Def main ():

Fun ('Hello, Hongten ')

If _ name _ = '_ main __':

Main ()

When we pass a parameter to the fun () function, we can print the passed parameter value information.

The printed information here is:

Hello, Hongten

For the following use cases:

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Def fun (a = 1, B = None, c = None, * args ):

Print ('{0}, {1}, {2}, {3}'. format (a, B, c, args ))

Def main ():

Fun (a = 'one ')

Fun ('one ')

If _ name _ = '_ main __':

Main ()

When the passing parameters are fun (a = 'one') and fun ('one'), the values are copied to parameter, the effects of all two parameters are the same:

One, None, None ,()

One, None, None ,()

Of course, we can also assign values to parameters B, c, and * args.

For example:

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Def fun (a = 1, B = None, c = None, * args ):

Print ('{0}, {1}, {2}, {3}'. format (a, B, c, args ))

Def main ():

Fun ('one', 1, 2, ('hongten '))

If _ name _ = '_ main __':

Main ()

In this way, values are assigned to parameters B, c, and args.

Running effect:

One, 1, 2, ('hongten ',)

In the preceding column, we cannot bypass the parameters a, B, and c in front of * args to copy * args:

For example:

def fun(a=1, b=None, c=None, *args):    print('{0},{1},{2},{3}'.format(a, b, c, args))      def main():    fun(args=('hongten'))      if __name__ == '__main__':    main()

Running effect:

Traceback (most recent call last ):

File "E:/Python33/python_workspace/test_fun.py", line 21, in

Main ()

File "E:/Python33/python_workspace/test_fun.py", line 18, in main

Fun (args = ('hongten '))

TypeError: fun () got an unexpected keyword argument 'args'

However, for parameters a, B, and c, you can assign values in this way.

For example:

def fun(a=1, b=None, c=None, *args):    print('{0},{1},{2},{3}'.format(a, b, c, args))      def main():    fun(c=('hongten'), b=2, a=[1,2,3])      if __name__ == '__main__':    main()

Running effect:

[1, 2, 3], 2, hongten ,()