方法一:使用in关键字 Python中的in关键字可以用来判断一个字符串是否包含另一个子字符串。使用这种方法非常简单,只需要将待判断的子字符串放在原始字符串后面,然后用in关键字连接即可。 # 使用in关键字判断字符串是否存在某个子字符串string="Hello, world!"substring="world"ifsubstringinstring:print("Substring fo...
Note that find() function returns the index position of the substring if it’s found, otherwise it returns -1. Count of Substring Occurrence We can usecount() functionto find the number of occurrences of a substring in the string. s = 'My Name is Pankaj' print('Substring count =', s...
“she” not in str string模块,还提供了很多方法,如 S.find(substring, [start [,end]]) #可指范围查找子串,返回索引值,否则返回-1 S.rfind(substring,[start [,end]]) #反向查找 S.index(substring,[start [,end]]) #同find,只是找不到产生ValueError异常 S.rindex(substring,[start [,end]])#同...
Python Copy word[-2] # Second-to-last character.The output is:Output Copy 'o' SlicesPython supports both indexing, which extracts individual characters from a string, and slicing, which extracts a substring (or slice). To slice, you indicate a range in the format start:end. The start...
In this tutorial, you'll learn how to remove or replace a string or substring. You'll go from the basic string method .replace() all the way up to a multi-layer regex pattern using the sub() function from Python's re module.
str.index(sub[, start[, end]]) --> int检测字符串string中是否包含子字符串 sub,如果存在,则返回sub在string中的索引值(下标),如果指定began(开始)和end(结束)范围,则检查是否包含在指定范围内,该方法与python find()方法一样,只不过如果str不在string中会报一个异常(ValueError: substring not found)。
/usr/bin/python # substrings.py a = "I saw a wolf in the forest. A lone wolf." print(a.find("wolf")) print(a.find("wolf", 10, 20)) print(a.find("wolf", 15)) print(a.rfind("wolf")) We have a simple sentence. We try to find the index of a substring in the sentence...
String slicing is an approach that allows you to extract the substring of the given string, not the substring itself, even if you can extract specific characters.In Python, two ways exist to extract a substring from the given string.
Return centered in a string of length width. Padding is done using the specified fillchar (default is a space). Changed in version 2.4: Support for the fillchar argument. str.count(sub[, start[, end]]) 返回sub子串的数量 Return the number of non-overlapping occurrences of substring sub in...
python三引号允许一个字符串跨多行,字符串中可以包含换行符、制表符以及其他特殊字符。实例如下para_str = """这是一个多行字符串的实例多行字符串可以使用制表符 TAB ( \t )。也可以使用换行符 [ \n ]。 """ print (para_str) --- 这是一个多行字符串的实例多行字符串可以使用制表符 TAB ( )。...