How to find the length of a string in Python? (code example)

In Python a string is an immutable sequence of Unicode code points. Given a string, how do we find its length? This article will introduce you to four methods of finding the length of a string in Python. I hope it will be helpful to you. [Recommended related video tutorials: Python Video Tutorial]

Method 1: Use the built-in function len.

Python’s built-in function len can return the number of items in the container. Example:

# 使用 len 函数
str="PHP中文网";
len=len(str);
print("字符串‘",str,"’的长度为:",len);

Output:

Method 2: Use for loop and operator

Strings can be iterated directly in the for loop, and the length of the string is the number of iterations.

Example:

#循环的使用
#返回字符串长度
def findLen(str): 
    counter = 0    
    for i in str: 
        counter += 1;
    return counter ;
str = "hello world！";
len=findLen(str);
print("字符串‘",str,"’的长度为:",len);

Output:

##Method 3: Using while loop and slicing

We slice a string so that it shortens by 1 on each iteration, eventually resulting in an empty string; this is when the while loop stops. However, the length of the string is also the number of iterations.

Example:

#使用while循环
#返回字符串长度
def findLen(str): 
    counter = 0
    while str[counter:]: 
        counter += 1
    return counter 
  
str = "absDGsaQfgd";
len=findLen(str);
print("字符串‘",str,"’的长度为:",len);

Output:

##Method 4: Use string join method and count method
#The join method of strings accepts iteration and returns a string, which is generated by concatenating the specified characters in the iteration to generate a new string; the count method can count characters The number of times a certain character appears in a string. However, the length of the string is the number of occurrences of each character in the string counted using the join method and the count method.

Example:

#使用join方法和count方法
#返回字符串长度
def findLen(str): 
    if not str: 
        return 0
    else: 
        some_random_str = 'py'
        return ((some_random_str).join(str)).count(some_random_str) + 1
str = "hello PHP中文网！";
len=findLen(str);
print("字符串‘",str,"’的长度为:",len);

Output:

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