Python function error : '

问题

I am working on repeats classification project. I am calculating time lapse in between a repeat and fresh mail in days. I want to apply a function on this time lapse which states whether it is a fresh mail or repeat mail.

function:

days = df['days_difference']
if(days<30):
   return 'repeat'
else:
   return 'fresh'

I am getting error: not supported between instances of 'str' and 'int'

'days_difference' column contains integer values along with None values.

looking for a solution !

回答1:

That basically means that your 'days ' variable is a string. You can not compare strings with integers using "<". Try :

...
if(int(days)<30):
...

回答2:

One recommendation which you should consider, always perform a search with the exact error you get from python, and often times you get your response within 0.1 ms.

In your case, you are comparing an integer value (let's say 2) to a string value, which happens to be '2') and python does not understand.

You can compare `int(days)' and 30 like:

if(int(day) < 30):
    return 'repeat'
else: 
    return 'fresh'

回答3:

The error is self-explaining :

Python function error : '<' not supported between types 'str' and 'int'

This is caused by a comparison of str and int types, which is invalid in Python 3 (although it's ok in Python 2).

Example :

result = '20' > 10  # In Python 3, this is illegal and will raise an exception

In your case, the error is most probably caused by the test if(days<30):. Your dataframe probably contains str values. You may need to convert them to int before trying to compare to another value:

days = int(df['days_difference'])
if(days<30):
   return 'repeat'
else:
   return 'fresh'

来源：https://stackoverflow.com/questions/53669611/python-function-error-not-supported-between-types-str-and-int

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python

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operators