# count()统计字符串中特定单词或短语出现次数(n = 3)

strs = 'Good! Today is good day! Good job!'

n = strs.lower().count("good")

print(strs, "\ngood的个数：", n)

print("输出字符串前五个字符：", strs[0:5])

# 统计列表每个元素中指定单词出现的个数(n = 2)

n = 0

list = ['good day', 'bad', 'well', 'Good job']

for i in list:

    n += i.lower().count('good')

print(list, "\ngood的个数：", n)

# 统计列表中指定元素出现的个数(n = 1)

n = 0

n = list.count('good day')

print(list, "\ngood的个数：", n)

Good! Today is good day! Good job!

good的个数： 3

输出字符串前五个字符： Good!

['good day', 'bad', 'well', 'Good job']

good的个数： 2

['good day', 'bad', 'well', 'Good job']

good的个数： 1