Local Variable 'df' referenced before assignment UnboundLocalError

Asked Aug 25 '20 at 19:58

Active Aug 25 '20 at 20:00

Viewed 21 times

I'm getting that error eventhough the name of my function is different from that of my variable inside the function.

import pandas as pd

df = pd.read_csv('file.csv', usecols=('Date','Col2','Col3'))

def foo():
    df['Date'] = pd.to_datetime(df.Date)
    df = df.dropna()
    return df
print(foo())

Here's the error that I'm getting:

df['Date'] = pd.to_datetime(df.Date)
UnboundLocalError: local variable 'df' referenced before assignment

What should i do to resolve the issue?

asked Aug 25 '20 at 19:58

ssmm

1

try `def foo(df):` – RichieV Aug 25 '20 at 20:00
1

@S3DEV that's not precisely the issue. The problem is that the compiler has marked `df` as a local variable, and the OP tries to use that local variable before the assignment – juanpa.arrivillaga Aug 25 '20 at 20:00
@juanpa.arrivillaga - Excellent. Thanks for the clarification. – S3DEV Aug 25 '20 at 20:04
@RichieV it worked. Thank you! – ssmm Aug 25 '20 at 20:09

Local Variable 'df' referenced before assignment UnboundLocalError

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