scope of variable

M

M B

Hi,
I try to learn python.
I don't understand this:

(running in idle)
print dept

dept+=1
print dept

Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
mud()
File "<pyshell#6>", line 2, in mud
dept+=1
UnboundLocalError: local variable 'dept' referenced before assignment
Regards MB
 

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