def python_tokenize(text):
# YOUR CODE HERE
# empty array
result = []

# making a flag
# to store the previous character in the working string
p = 'start'

# split text to words
for word in text.split():
   p == 'start'
   my_str = ""

   # split word to character
   for c in word:
         # at first, add the character to the empty string
         if p == 'start':
            my_str += c
            pass
         else:
            # otherwise, check its type with the type of previous character

            # letter case
            # c may be a part of a stop word, a variable or a function name
            if c.isalpha() or c == '_':

               # the previous character is a letter or an _
               # or it's is a number and the number is not at head of the string
               # for examle: int2string is a legal varialbe and function name
               if p.isalpha() or p == '_' or (p.isdigit() and len(my_str) > 0):
                     my_str += c
                     pass
               else:
                     # the previous character doesn't meet other requirements
                     # and it is not empty
                     # so it is a token
                     # push it to array
                     if my_str:
                        result.append(my_str)
                        pass
                     # set its content to the new character
                     my_str = c
                     pass
               pass

            # bracket cases
            elif c == '(' or c == ')':
               # add current string to the array
               if my_str:
                     result.append(my_str)
                     pass
               # add the brackete to the array
               result.append(c)
               # empty the string
               my_str = ""
               pass

Problem: Reading Computer Science Career Fair file and modifying an...