article = '''This is a photograph of our village.
Our village is in a valley.
It is between two hills.
The village is on a river.
Here is another photograph of the village.
My wife and I are walking along the banks of the river.
We are on the left.
There is a boy in the water.
He is swimming across the river.
Here is another photograph.
This is the school building.
It is beside a park.
The park is on the right.
Some children are coming out of the building.
Some of them are going into the park.
'''
def get_word_count(article):
count = {}
word_list=article.lower().replace('.','').split()
for word in word_list:
if word in count:
count[word] += 1
else:
count[word] = 1
return count
print(get_word_count(article))
为啥定义的空字典但是在执行if语句时字典中已经有了内容呢？
各位大神求解！！！
else:中不就是 count[word] = 1 对字典添加属性了么
if word in count:
count[word] += 1
else:
count[word] = 1
这个if---else的意思就是：
如果 word的值 在 count字典中，
则count字典的word值的属性增加1
否则就给 count字典中添加一个word值的属性并赋值为1。
if---else是在for循环中重复执行的。
当某个word值第一次出现时是，给字典中添加一个属性。
当这个word值再次出现时，字典中就已经有了这个属性，就对这个属性增加1。
def get_word_count(article):
count = {}
word_list=article.lower().replace('.','').split()
for word in word_list:
if word in count.keys():
count[word] += 1
else:
count[word] = 1
return count
print(get_word_count(article))其实就只需要将 `if word in count` 改成 `if word in count.keys()` 即可
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