Return multiple value

[Enoizat]

lastchance wrote:

And you would be hard pressed to tell a student that (C++):
for ( const auto &x : S )
is more readable than (Python):
for x in S:

Just out of curiosity (if I may hijack this thread): ‘x’ in that Python example would be a copy or a reference?

[lastchance]

Enoizat wrote:

Just out of curiosity (if I may hijack this thread): ‘x’ in that Python example would be a copy or a reference?

Ah, "copy or reference" is a C++ term ... it doesn't really have a meaning in Python.

What you get depends on whether the objects in S are mutable or immutable:

S1 = ( 1, 2, 3, 4 )             # tuple of immutable objects
S2 = ( [1], [2], [3], [4] )     # tuple of mutable objects
print( S1, S2, sep='\n', end="\n\n" )

for x1 in S1:
    x1 *= 10
for x2 in S2:
    x2 += [0]
print( S1, S2, sep='\n' )

(1, 2, 3, 4)
([1], [2], [3], [4])

(1, 2, 3, 4)
([1, 0], [2, 0], [3, 0], [4, 0])

TBH, I've got used to Fortran (pass by reference by default if the argument is a variable) and C++ (pass by value by default), but Python sometimes leaves me confused!

So, I'll keep Python for post-processing and plotting graphs and stick to Fortran/C++ for heavy number-crunching.

[Enoizat]

Thank you for your answer, lastchance.

(BboyCico, sorry for exploiting your thread.)