codeacademy python tasks , Python

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#python 2.7.12

def censor(text, word):

wordList = text.split(' ')
    for index, item in enumerate(wordList):
        
        if item == word:
            wordList[index] = "*"*len(word)
    
    return " ".join(wordList)
    
print '--censor task--'  
print censor('kwa kwa raz kwa', 'raz')

def count(sequence, item):
  result = 0
  for i in sequence:
    if i == item:
      result += 1
  return result
    
print '--count task--'  
print count([2,3,6.5,6.54,3,2,7,8,9,8,7,6,5,4,4,43,3,3,2,2,2], 2)

def purify(items):
  result = [i for i in items if i % 2 == 0]
  return result
    
print '--purify task--'  
print purify([1,5,6,4,2,3,6,8,9,8,7,6])

def product(items):
  result = 1
  for i in items:
    result *= i
  
  return result

print '--product task--'  
print product([1,2,2,3,4,5])
  
    
def check_val(items, val):
    
    for i in items:
        if i == val:
            return True
        
    return False
    
    
def remove_duplicates(items):
  result = []
  for i in items:
    if check_val(result, i):
      continue
    else:
      result.append(i)
        
  #result = [i for i in items if i not in result]
  #for i in items:
  #  if i not in result:
  #    result.append(i)
  return result
print '--remove_duplicates task--'   
print remove_duplicates([1,2,3,0,3,0,3,2,4,5,6,6,6,100,0,44])

def median(items):
  
  if(len(items) == 1): return 1
    
  newArr = sorted(items)
 
  if len(newArr) % 2 == 0:
    temp = newArr[len(newArr)/2-1 : len(newArr)/2+1]
    return sum(temp) / 2.0

else:
    temp = newArr[len(newArr)/2 : len(newArr)/2+1]
    return temp[0]

print '--median task--'
print median([1,2.3,3,3])

# 
#
grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]

def print_grades(grades_input):
  for grade in grades_input:
    print grade

def grades_sum(scores):
  total = 0
  for score in scores: 
    total += score
  return total
    
def grades_average(grades_input):
  sum_of_grades = grades_sum(grades_input)
  average = sum_of_grades / float(len(grades_input))
  return average

def grades_variance(scores):
  average = grades_average(scores)
  variance = 0
  
  for score in scores:
    variance += (average - score) ** 2
  variance /= len(scores)
  return variance

def grades_std_deviation(variance):
  return variance ** 0.5

variance = grades_variance(grades)
print "--EXAM STATISTICS task--"
print_grades(grades)
print "sum of grades:", grades_sum(grades)
print "average grade:", grades_average(grades)
print "variance grade:", grades_variance(grades)
print "standart deviation:", grades_std_deviation(variance)

[ + ] Show input
Absolute running time: 0.13 sec, cpu time: 0.08 sec, memory peak: 4 Mb, absolute service time: 0,14 sec