What am I doing wrong here?
counter = 0
def increment():
counter += 1
increment()
The above code throws an UnboundLocalError.
What am I doing wrong here? counter = 0 def increment(): counter += 1
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What am I doing wrong here?
counter = 0
def increment():
counter += 1
increment()
The above code throws an UnboundLocalError.
Python doesn’t have variable declarations, so it has to figure out the scope of variables itself. It does so by a simple rule: If there is an assignment to a variable inside a function, that variable is considered local.[1] Thus, the line
implicitly makes
counterlocal toincrement(). Trying to execute this line, though, will try to read the value of the local variablecounterbefore it is assigned, resulting in anUnboundLocalError.[2]If
counteris a global variable, theglobalkeyword will help. Ifincrement()is a local function andcountera local variable, you can usenonlocalin Python 3.x.