On 23/07/2015 12:24, candide wrote:
[...]
Now, global declaration has another restriction, as PLR explains:
[https://docs.python.org/3.4/reference/simple_stmts.html#the-global-statement]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Names listed in a global statement must not be defined as formal parameters
or in a for loop control target,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
What I understand is that the following is a must-not-code:
# ---------------------------------------
def f():
global i
for i in range(1,3):
print(10*i)
f()
print(i)
# ---------------------------------------
But, the later code executes silently without any warning:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10
20
2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
So my question is: what is the restriction about global as loop control
variable the docs is referring to?
I think for situations like this one?
# ---------------------------------------
def f():
global temperature
for temperature in range(1,3):
print "In f temperature is:", temperature
temperature = 500
print "temperature is now", temperature
f()
print"temperature is now:", temperature
# temperature is now "broken"
if temperature <= 100:
print "Launching rocket"
else:
# this never happens
print "temperature too high! Aborting launch."
# ---------------------------------------
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