Python-defined functions

1. Other Forms 1:

   1. Defining functions

   Def test4 (a = ()):

   Print (' ############### #test4 ################ ')

   Print (Type (a))

   Print (a)

   2. Calling functions

   Call correctly:

   Test4 ((1, 2)) #a在函数体内部为tuple类型

   Test4 (a= (1, 2)) #a在函数体内部为tuple类型

   Test4 (1,)) #a在函数体内部为tuple类型

   Test4 (a= (1,)) #a在函数体内部为tuple类型

   Test4 ((1)) #a在函数体内部为int类型, non-tuple type

   Test4 (a= (1)) #a在函数体内部为int类型, non-tuple type

   TEST4 (1) #a在函数体内部为int类型, non-tuple type

   Test4 (a=1) #a在函数体内部为int类型, non-tuple type

   Error Call:

   Test4 (1, 2) #TypeError: Test4 () takes at the most 1 argument (2 given)

   Test4 (1, b=2) #TypeError: Test4 () got an unexpected keyword argument ' b '

   Test4 (A=1, b=2) #TypeError: Test4 () got an unexpected keyword argument ' b '

3. 5

   Other Forms 2:

    

   1, define functions

    

   Def test5 (b = {}):

       print (' ############### #test5 ################ ')

       Print (type (b))

       print (b)

   2, call function

    

   correct invocation:

   Test5 ({ ' A ': 2})       #b在函数体内部为dict类型

   Test5 (b={' a ': 2})

   Test5 ({' A ': 2, ' B ': 3}) #b在函数体内部为dict类型

   Test5 (b={' a ': 2, ' B ': 3})

   Test5 (b=2)           #b在函数体内部为int类型, non-dict type

   Error Invocation:

   Test5 (A=1, b=2)   #TypeError: Test5 () got an unexpected keyword argument ' a '

   Test5 (1, 2)           #TypeError: Test5 () takes at the most 1 argument (2 given)

   Test5 (1, b=2)       #TypeError: test5 () got multiple values for keyword argument ' b '

5. 6

   Other Forms 3:

   1. Defining functions

   Def test6 (a = (), B = {}):

   Print (' ############### #test6 ################ ')

   Print (Type (a))

   Print (a)

   Print (type (b))

   Print (b)

   2. Calling functions

   Call correctly:

   Test6 (1, 2)

   Test6 (A=1, b=2)

   Test6 (A=1, b=2)

   Test6 ((1, 2), {' C ': 8})

   Test6 ({' C ': 8})

   Test6 (b={' C ': 8})

   Test6 ((1, 2), b=2)

   Test6 ((1, 2), b=2)

   Error Call:

   Test6 (A=1, 2) #SyntaxError: non-keyword arg after keyword arg

   Test6 (1, 2, b=2) #TypeError: Test6 () got multiple values for keyword argument ' b '

Python-defined functions