A common mistake for beginners is:
extraction = mystring[1 , 10]
TypeError: string indices must be integers
The reason is because of the [1 , 10] should be changed to: [1 : 10]
Example
This can happen when you want to extract information from a string or substring like:
mystring = 'This is a simple string [test].'
begin = mystring.find('[')
end = mystring.find(']')
if begin != -1 and end != -1:
substr = mystring[begin, end]
The problem is that string slices with indexes has different format which is:
substr = mystring[begin: end]
and not:
substr = mystring[begin, end]
Resources
More information can be found here: