Using DataFrame.query() with pandas.Series.str.contains gets AttributeError: 'dict' object has no attribute 'append'

Question

I created two query strings using str.contains() , and combine them, then pass it to DataFrame.query() .

I get an AttributeError: 'dict' object has no attribute 'append'.

Removing regex=False parameter worked fine but my data contains some '/*' . So I need this parameter to treat my data as a literal string.

import pandas as pd

df = pd.DataFrame({'city': ['osaka', ], 'food': ['apple', ],})

querystr1 = 'osaka'
querystr2 = 'apple'

querystr1 = "city.str.contains('" + querystr1 + "', regex=False)"
querystr2 = "food.str.contains('" + querystr2 + "', regex=False)"
querystr = querystr1 + ' & ' + querystr2
print(querystr)

value = df.query(querystr, engine='python').index.values.astype(int)

print(value)
print(value.size)

How can I query my dataframe not recognizing regular expressions? Is there a smarter way to do this?

Answer 1

I'm no expert, but removing the regex=False part worked for me:

import pandas as pd

df = pd.DataFrame({'city': ['osaka', ], 'food': ['apple', ],})

querystr1 = 'osaka'
querystr2 = 'apple'

querystr1 = "city.str.contains('" + querystr1 + "')"
querystr2 = "food.str.contains('" + querystr2 + "')"
querystr = querystr1 + ' & ' + querystr2
print(querystr)

value = df.query(querystr, engine='python').index.values.astype(int)