def find_substring_in(s, sub):""" 使用in关键字查找子字符串 """if sub in s:return Trueelse:return False# 定义一个字符串string = 'A New String Hello, World!'sub_string = "Hello"print('例1，源字符串为：', string, ' 待查找字符串为：', sub_string)print('子字符串是否包含：...
Strings can beconcatenatedto build longer strings using the plus sign and also they can bemultipliedby a number, which results in the continuous repetition of the string as many times as the number indicates. Also, if we want to find out thelengthof the string, we simply have to use thelen...
下面是一个状态图,展示了使用substring截取字符串的整个过程: StartDefineStringSliceStringPrintResult 在上述状态图中,我们首先开始(Start),然后定义字符串(DefineString),接着使用切片截取字符串(SliceString),然后打印截取的结果(PrintResult),最后回到开始状态。 希望这个状态图能够帮助你更好地理解substring截取字符串...
语法位置参数说明:string表示预处理字符串,[ ]表示为可选值,value表示必选值 一、字符查找类 1、string.find() 检测字符串是否包含特定字符,如果包含,则返回开始的索引;否则,返回-1 str = 'hello world' # 'wo'在字符串中 print( str.find('wo') ) #得到下标6 # 'wc'不在字符串中 print( str.find...
def find(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ """ S.find(sub[, start[, end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are ...
substring="python"string="welcome to pythontip"print(substringinstring) 如果存在,则返回True,否则返回False。此处,输出为True。 如何检查子字符串是否存在-另一种方法 你也可以使用find()方法检查字符串中是否存在子字符串。 如下示例: substring="zz"string="hello world"print(string.find(substring)) ...
If a substring doesn't exist inside the string, it returns-1. Working of find() method Working of Python string's find() and rfind() methods Example 1: find() With No start and end Argument quote ='Let it be, let it be, let it be'# first occurance of 'let it'(case sensitive...
substring = string[::2] print(substring) # "HloWrd" 通过切片进行字符串翻转 另一种使用 step 的方法,你可以使用它来反转字符串。只需要设置步长为负数,即可以实现从右往左切片,即可以实现字符串翻转。例子: string ='my string' # Use a negative step to reverse a string ...
string = 'Hello World, this is a string' # substring substring = 'this' if substring in string: print('Found the substring!') else: print('Could not find the substring.') 使用index() 方法 Python String类有一个 index() 方法,如果在字符串中找到目标子字符串,它将返回子字符串的索引。当你...
What is a Substring? Just imagine what a car company does to find out the last five digits of a Chassis Number in a fast and efficient manner. The solution to this image is hidden behind the concept of Substring. Let’s read along to know more about substring. Before moving ahead, you...