Python: UnboundLocalError: local variable 'open' referenced before assignment

Question

def read_lines():
    readFileName = "readfile.txt"
    f = open(readFileName, 'r+')
    contents = f.read()
        ... # and so on 

read_lines()

When I run this, I get an error message:

f = open(readFileName, 'r+')
UnboundLocalError: local variable 'open' referenced before assignment

+3

Rrr May 16 '12 at 16:50

1 answer

NPE · Accepted Answer · 2012-05-16T16:51:11+0000

This means that further in your function you create a variable with the name open:

open = ...

Rename it so that it does not interfere with the built-in function.