Python：找到出现次数最多的单词？

我试图让我的程序报告文本文件中出现最多的单词。例如，如果我输入“你好，我喜欢馅饼，因为它们非常好吃”，程序应该打印出“最喜欢的馅饼”。执行选项 3 时出现此错误：KeyError: 'h'

#Prompt the user to enter a block of text.
done = False
textInput = ""
while(done == False):
    nextInput= input()
    if nextInput== "EOF":
        break
    else:
        textInput += nextInput

#Prompt the user to select an option from the Text Analyzer Menu.
print("Welcome to the Text Analyzer Menu! Select an option by typing a number"
    "\n1. shortest word"
    "\n2. longest word"
    "\n3. most common word"
    "\n4. left-column secret message!"
    "\n5. fifth-words secret message!"
    "\n6. word count"
    "\n7. quit")

#Set option to 0.
option = 0

#Use the 'while' to keep looping until the user types in Option 7.
while option !=7:
    option = int(input())

#The error occurs in this specific section of the code.
#If the user selects Option 3,
    elif option == 3:
        word_counter = {}
        for word in textInput:
            if word in textInput:
                word_counter[word] += 1
            else:
                word_counter[word] = 1

        print("The word that showed up the most was: ", word)

我想你可能想做：

for word in textInput.split():
  ...

目前，您只是迭代中的每个字符textInput。因此，要迭代每个单词，我们必须首先将字符串拆分为单词数组。默认情况下.split()在空格上分割，但您可以通过将分隔符传递给来更改它split().

另外，您需要检查该单词是否在您的字典中，而不是在原始字符串中。所以尝试：

if word in word_counter:
  ...

然后，查找出现次数最多的条目：

highest_word = ""
highest_value = 0

for k,v in word_counter.items():
  if v > highest_value:
    highest_value = v
    highest_word = k

然后，只需打印出的值highest_word and highest_value.

要跟踪联系，只需保留最高单词的列表即可。如果我们发现出现次数更高，请清除列表并继续重建。这是到目前为止的完整程序：

textInput = "He likes eating because he likes eating"
word_counter = {}
for word in textInput.split():
  if word in word_counter:
    word_counter[word] += 1
  else:
    word_counter[word] = 1


highest_words = []
highest_value = 0

for k,v in word_counter.items():
  # if we find a new value, create a new list,
  # add the entry and update the highest value
  if v > highest_value:
    highest_words = []
    highest_words.append(k)
    highest_value = v
  # else if the value is the same, add it
  elif v == highest_value:
    highest_words.append(k)

# print out the highest words
for word in highest_words:
  print word