On 11/17/2011 3:26 PM ADRIAN KELLY said...
i know i'm stupid but i have tried everything to get one line of text
working, i have written out pseudo and read every website.....
now i am getting this error............
Traceback (most recent call last):
File "F:\VTOS ATHLONE\PYTHON_VTOS\foreign exchange\f_ex4 - Copy.py",
line 24, in <module>
main()
File "F:\VTOS ATHLONE\PYTHON_VTOS\foreign exchange\f_ex4 - Copy.py",
line 14, in main
while amount<50:
UnboundLocalError: local variable 'amount' referenced before assignment
You've seen the fixes, but perhaps more explanation helps too.
Python organizes variables into namespaces. The normal namespace
resolution sequence is local, global, builtin. Assigning to a name
within a function creates a local variable, otherwise accessing a name
in a function will use the global or builtin namespaces. Python decides
these issues in part during initial loading of the module where it sees
that you assign to the variable amount within the function, thus
creating a local variable. Later, during execution, you first test the
value of amount (in the while statement), but amount isn't assigned to
until after the test, ergo, UnboundLocalError.
HTH,
Emile
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