List of articles

• Python count() Method ： Count the number of string occurrences
• • count The syntax of the method is as follows ：
  • • 【 example 1】 Retrieve string “c.biancheng.net” in “.” Number of occurrences .
    • 【 example 2】
    • 【 example 3】

Python count() Method ： Count the number of string occurrences

count Method to retrieve the number of times a specified string appears in another string , If the retrieved string does not exist , Then return to 0, Otherwise, return the number of occurrences .

count The syntax of the method is as follows ：

str.count(sub[,start[,end]])

In this way , The specific meaning of each parameter is as follows ：

• str： Represents the original string ;
• sub： Represents the string to retrieve ;
• start： Specify the starting location of the search , That is, from where to start the detection . If you don't specify , Search from scratch by default ;
• end： Specify the end of the retrieval , If you don't specify , It means to search all the way to the end .

【 example 1】 Retrieve string “c.biancheng.net” in “.” Number of occurrences .

>>> str = "c.biancheng.net"
>>> str.count('.')
2

【 example 2】

>>> str = "c.biancheng.net"
>>> str.count('.',1)
2
>>> str.count('.',2)
1

I talked about it before. , The retrieval value corresponding to each character in the string , from 0 Start , therefore , Retrieve values in this example 1 Corresponding to No 2 Characters ‘.’, From the output we can analyze , Retrieve from the specified index location , It also includes the index location .

【 example 3】

>>> str = "c.biancheng.net"
>>> str.count('.',2,-3)
1
>>> str.count('.',2,-4)
0