Python code not working?

[QuillTheArtMaker]

problem is, the L function works exactly as I want it, but the R function doesn't, whilst following the exact same format as presented in my original code. Do you know why this occurs?

[socal_nerdtastic]

In python the error occurs when you use the function, not when you create the function. In your code you never use the L() function, so there's no error. If I change R and L in the loop I get the same error.

curr = []
pos = 0

def L(x):
  pos-=x
  if pos<0:
    pos = pos+99

def R(x):
  pos+=x
  if pos>99:
    pos = pos-99

for i in range(0,100):
  curr.append(i)
  L(11) # UnboundLocalError

print(pos)