I looked in all kind of similar questions, but just couldn't find one that fitted my situation (or maybe there is one, but I'm new to programming).
The version of Python that I use is 2.7.4, and I get in my program the error on line 11: NameError: global name 'opp' is not defined
I wanted to make a calculator for dimensions of floors. Here is my code:
def oppervlakte():
global lengte
global br
global opp
lengte = raw_input("Voer de lengte in: ") # Put in the length
br = raw_input("Voer de breedte in: ") # Put in the width
opp = lengte * br # Calculates the dimension of the floor
return int(lengte), int(br) # Makes the variables lengte & br an integer
print opp
Since I now got the answer, I want to share it with you, so here it is:
def oppervlakte():
lengte = raw_input("Voer de lengte in: ") # Asks for the length
br = raw_input("Voer de breedte in: ") # Asks for the width
lengte = int(lengte) # String lengte --> int lengte
br = int(br) # String br --> int br
opp = lengte * br # Calculates the dimensions of the floor
return opp, lengte, br
opp, lengte, br = oppervlakte()
print "De oppervlakte is", opp # Prints the dimension
You should call your function, otherwise opp
will not get defined.
oppervlakte()
print opp
But a better way would to return opp
from the function and assign to a variable in global namespace.
def oppervlakte():
lengte = int(raw_input("Voer de lengte in: ")) #call int() here
br = int(raw_input("Voer de breedte in: ")) # call int() here
opp = lengte * br # Calculates the dimension of the floor
return opp, lengte, br
opp, lengte, br = oppervlakte()
And just calling int()
on a string will not make it an integer, you should assign the returned value to a variable.
>>> x = '123'
>>> int(x) #returns a new value, doesn't affects `x`
123
>>> x #x is still unchanged
'123'
>>> x = int(x) #re-assign the returned value from int() to `x`
>>> x
123
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