使用 function 到每个元素的元组字符串

Question

There is a tuple (a, b, c) .

I need to get foo(a) + "\n" + foo(b) + "\n" + foo(c)

How it can be done in a smart way, not manually?

Answer 1

You could do it this way (if foo() returns a string):

tuple_ = (a,b,c)
"\n".join( foo(i) for i in tuple_ )

if foo() doesn't return a string:

tuple_ = (a,b,c)
"\n".join( str(foo(i)) for i in tuple_ )

Edit

If writing for python < 2.4 use this since generator expressions were added in Python 2.4:

tuple_ = (a,b,c)
"\n".join([ str(foo(i)) for i in tuple_ ])

Answer 2

As long as foo is a string:

 "\n".join(map(foo,tup))