return True stop the loop in Python?

Question

I am still a beginner but does not know why the \"return True\" in a \"for loop\" stop the loop after the first pass. If I use something else than \"return\", everything is fine

Answer 1

You can use the yield statement. A return statement stops the function and immediately and returns the value while yield statement will return the value and but continues where it left.

if side == (0,0):
    for (x,y) in (0,1),(0,2),(0,3):
        print(King.ok_to_move(self,x,y))
        if p.getPiece(x,y)=="" and king.ok_to_move(self,x,y):
            yield True

Now use: list(roc_valid(self,cote_x,cote_y)) to get a list of all returned values or just next(roc_valid(self,cote_x,cote_y)) to get only the first value.

Demo:

def func():
    for i in xrange(5):
        if i % 2: 
            yield True
...             
>>> list(func())          #all returned values
[True, True]
>>> next(func())          #Just the first returned value
True

Related: The Python yield keyword explained