TypeError: 'NoneType' object is not subscriptable

I am having issue with the code you shared on Medium article named "A Practitioner's Guide to Natural Language Processing (Part I) — Processing & Understanding Text" where contraction.py file was used in the code.

def expand_contractions(text, contraction_mapping=CONTRACTION_MAP):

    contractions_pattern = re.compile('({})'.format('|'.join(contraction_mapping.keys())), 
                                      flags=re.IGNORECASE|re.DOTALL)
    def expand_match(contraction):
        match = contraction.group(0)
        first_char = match[0]
        expanded_contraction = contraction_mapping.get(match)\
                                if contraction_mapping.get(match)\
                                else contraction_mapping.get(match.lower())                       
        expanded_contraction = first_char+expanded_contraction[1:]
        return expanded_contraction

    expanded_text = contractions_pattern.sub(expand_match, text)
    expanded_text = re.sub("'", "", expanded_text)
    return expanded_text

and while running the function on the data I am getting the error as mentioned in title.

df['Text_of_quest'] = [expand_contractions(x) for x in df['Text_of_quest'].to_list() if x is not None]

Traceback:

TypeError                                 Traceback (most recent call last)
<ipython-input-23-4358bc968219> in <module>
----> 1 get_ipython().run_cell_magic('timeit', '', "df['Text_of_quest'] = [expand_contractions(x) for x in df['Text_of_quest'].to_list() if x is not None]\n")

~/.conda/envs/project1/lib/python3.8/site-packages/IPython/core/interactiveshell.py in run_cell_magic(self, magic_name, line, cell)
   2360             with self.builtin_trap:
   2361                 args = (magic_arg_s, cell)
-> 2362                 result = fn(*args, **kwargs)
   2363             return result
   2364 

<decorator-gen-60> in timeit(self, line, cell, local_ns)

~/.conda/envs/project1/lib/python3.8/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
    185     # but it's overkill for just that one bit of state.
    186     def magic_deco(arg):
--> 187         call = lambda f, *a, **k: f(*a, **k)
    188 
    189         if callable(arg):

~/.conda/envs/project1/lib/python3.8/site-packages/IPython/core/magics/execution.py in timeit(self, line, cell, local_ns)
   1158             for index in range(0, 10):
   1159                 number = 10 ** index
-> 1160                 time_number = timer.timeit(number)
   1161                 if time_number >= 0.2:
   1162                     break

~/.conda/envs/project1/lib/python3.8/site-packages/IPython/core/magics/execution.py in timeit(self, number)
    167         gc.disable()
    168         try:
--> 169             timing = self.inner(it, self.timer)
    170         finally:
    171             if gcold:

<magic-timeit> in inner(_it, _timer)

<magic-timeit> in <listcomp>(.0)

<ipython-input-9-90eb3c3afe2e> in expand_contractions(text, contraction_mapping)
     12         return expanded_contraction
     13 
---> 14     expanded_text = contractions_pattern.sub(expand_match, text)
     15     expanded_text = re.sub("'", "", expanded_text)
     16     return expanded_text

<ipython-input-9-90eb3c3afe2e> in expand_match(contraction)
      9                                 if contraction_mapping.get(match)\
     10                                 else contraction_mapping.get(match.lower())
---> 11         expanded_contraction = first_char+expanded_contraction[1:]
     12         return expanded_contraction
     13 

TypeError: 'NoneType' object is not subscriptable

Why NoneType error even after i checked for None value in my dataframe column?

dipanjanS / practical-machine-learning-with-python

TypeError: 'NoneType' object is not subscriptable #27