f2py::演示Fortran字符串在python中的用法

C FILE: STRING.F
SUBROUTINE FOO(A,B,C,D)
CHARACTER*5 A, B
CHARACTER*(*) C,D
Cf2py intent(in) a,c
Cf2py intent(inout) b,d
PRINT*, "A=",A
PRINT*, "B=",B
PRINT*, "C=",C
PRINT*, "D=",D
PRINT*, "CHANGE A,B,C,D"
A(1:1) = 'A'
B(1:1) = 'B'
C(1:1) = 'C'
D(1:1) = 'D'
PRINT*, "A=",A
PRINT*, "B=",B
PRINT*, "C=",C
PRINT*, "D=",D
END
C END OF FILE STRING.F

f2py -c -m mystring string.f

>>> import mystring
>>> print mystring.foo.__doc__
foo - Function signature:
foo(a,b,c,d)
Required arguments:
a : input string(len=5)
b : in/output rank-0 array(string(len=5),'c')
c : input string(len=-1)
d : in/output rank-0 array(string(len=-1),'c')

>>> import Numeric
>>> a=Numeric.array('123')
>>> b=Numeric.array('123')
>>> c=Numeric.array('123')
>>> d=Numeric.array('123')
>>> mystring.foo(a,b,c,d)
A=123
B=123
C=123
D=123
CHANGE A,B,C,D
A=A23
B=B23
C=C23
D=D23
>>> a.tostring(),b.tostring(),c.tostring(),d.tostring()
('123', 'B23', '123', 'D23')