String Join treats True as Boolean rather than string

Question

I am writing code to read data from a CSV file to a pandas dataframe and to get the unique values and concatenate them as a string. The problem is that one of the columns contains the values True and False. So while concatenating the values I am getting the error

  sequence item 0: expected str instance, bool found

I want python to treat True as string rather than boolean value.

I have tried many options but none worked.

The full code and a traceback are attached below.

import pandas as pd
df=pd.read_csv('C:/Users/jaiveeru/Downloads/run_test1.csv')
cols=df.columns.tolist()
for i in cols:
    lst=df[i].unique().tolist()
    str1 = ','.join(lst)
    lst2=[str1]

----> 5     str1 = ','.join(lst)
TypeError: sequence item 0: expected str instance, bool found

lst2 should have values ['True,False']

Answer 1

Python 3 does not preform implicit casts. You will need to explicitly cast your booleans to strings.

This can be done easily with map builtin function which applies a function on each item of an iterable and returns the result:

str1 = ','.join(map(str, lst))