Question #695676 on Yade changed:
https://answers.launchpad.net/yade/+question/695676
Jan Stránský posted a new comment:
the use of global is OK in the example (inside a function, before
accessing global variable), although it is not necessary in this "read"
case. global would be needed in case of assigning to a global variable.
Example (in pure python):
### not assigning
l = [1,2,3]
def trail():
l.append(4) # no need of global
trail()
print(l) # [1,2,3,4]
###
### assigning
l = [1,2,3]
def trail():
l = [4,5,6] # l is local to trail, different from global l
trail()
print(l) # [1,2,3]
#
def trail():
global l
l = [4,5,6] # now l is the global l
trail()
print(l) # [4,5,6]
###
cheers
Jan
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