Let's say the following is being returned by your Python script.

TypeError: cannot concatenate 'str' and 'bool' objects

This occurs when attempting to do something with both a string and a boolean. For example, the following script would return the error.

#!/usr/bin/python
foo = True
print ("Hello " + foo)

type could be used to see the foo is a boolean and Hello is a string.

#!/usr/bin/python
foo = True
greeting = "Hello"
print(type(foo))
print(type(greeting))

Sometimes it makes sense to wrap the boolean inside of the str function. In this example, the error would no longer be returned and the script would print Hello True.

#!/usr/bin/python
foo = True
print ("Hello " + str(foo))

Or better yet, use Python3 f-string formatter.

#!/usr/bin/python3
foo = True
print (f"Hello {foo}")