Question

As per the python documentation,x<y<z comparison is translated to x<y and y<z and expression y is evaluated only once at most.
Now my question is , does an expression y ( look at the code below) is evaluated only once here?

if(x<y and y<z):

Answer 1

Twice:

>>> def f():
...   print "F called"
...   return 1
...
>>> 0 < f() < 100
F called
True
>>> 0 < f() and f() < 100
F called
F called
True
>>> if (0 < f() and f() < 100):
...   print True
...
F called
F called
True
>>>