The last method to check for a substring we used returned a Boolean value. This will work well in your code if all you need to know is if the substring simply exists in the string. But if you need to know the substring’s location in the string, you will need to use a different m...
In order to avoid thisTraceback Error, we can use the keywordinto check if a substring is contained in a string. In the case of Loops, it was used for iteration, whereas in this case it’s a conditional that can be eithertrueorfalse.It’ll be true if the substring is part of the ...
How to Check if a Python String Contains a Substring In this quiz, you'll check your understanding of the best way to check whether a Python string contains a substring. You'll also revisit idiomatic ways to inspect the substring further, match substrings with conditions using regular expressio...
Theinoperator checks if a substring is present in a string and returns a boolean value. Thefind()method returns the index of the first occurrence of the substring, or -1 if it’s not found. text="Learning Python is fun!"substring="Python"iftext.find(substring)!=-1:print(f'"{text}" ...
Another way to check if a string contains a substring in Python is by using thefind()method. It returns the index of the first occurrence of the substring within the string. If the substring is not found, it returns -1. Here’s an example: ...
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.
ValueError: substring not found >>> str.index("n") #同find类似,返回第一次匹配的索引值 4 >>> str.rindex("n") #返回最后一次匹配的索引值 11 >>> str.count('a') #字符串中匹配的次数 0 >>> str.count('n') #同上 2 >>> str.replace('EAR','ear') #匹配替换 'string learn' >>>...
You can extract asubstringfrom a string by using slice. Format:[start:end:step] [:]extracts the all string [start:]fromstartto the end [:end]from the beginning to theend - 1offset [start:end]fromstarttoend - 1 [start:end:step]fromstarttoend - 1, skipping characters bystepjupyter not...
results={"Using in":substringintarget_string,"Using find()":target_string.find(substring)!=-1,"Using index()":True}try:position=target_string.index(substring)exceptValueError:results["Using index()"]=False# 输出最终结果formethod,foundinresults.items():print(f"Method:{method}, Result:{'Found...
for i in range(1, 6): s = s + i print( s) # 这里的缩进和上一行不一致 如果不理解缩进,可以参考理解Python的代码缩进 - 知乎 (zhihu.com)。 2.NameError: name 'xxx' is not defined 某个变量没有定义就去使用它。 for i in range(1, 6): ...