In both cases, the code prints asubstring from the beginning. Use this method to fetch a substring before a specific character. Create Substring from Index to End To create a substring from a specific index to the end, see the following example: quote = "Toto, I have a feeling we're n...
print(x) # My name is Lokesh Gupta and age is 38 6.11. index() 它在给定的字符串中查找指定值的第一次出现。 如果找不到要搜索的值,则会引发异常。 字符串index() txt = "My name is Lokesh Gupta" x = txt.index("e") print(x) # 6 x = txt.index("z") # ValueError: substring not...
在python中没有类似sub()或者subString()的方法,但是字符串的截取操作却是更加简单。只需要把字符串看作是一个字符数组,截取子串非常方便。多余的话就不啰嗦了,看下面的例子就明白了。str = ’0123456789′ print str[0:3] #截取第一位到第三位的字符 print str[:] #截取字符串的全部字符 print str[6:] ...
我们利用substring_index根据分隔符进行截取相应的字符串,然后再利用mysql库的help_topic表的help_topic_id字段来进行截取,因为help_topic_id是从0自增的,我们利用length函数和replace函数来计算出有多少个分隔符,相应的去截取多少次 selectt.name,substring_index(substring_index(t.subject,';',m.help_topic_id+1...
print("Substring 'Java':", result) Run Code Output Substring 'is fun': 19 Traceback (most recent call last): File "<string>", line 6, in result = sentence.index('Java') ValueError: substring not found Note:Index in Python starts from0and not1. So the occurrence is19and not20. ...
The index() method returns the index of the first occurence of a substring in the given string. It is same as the find() method except that if a substring is not found, then it raises an exception.
text="Python is a powerful programming language"sub_string="programming"match=re.search(sub_string,text)ifmatch:start_index=match.start()end_index=match.end()print(f"The substring '{sub_string}' is found from index{start_index}to{end_index}")else:print(f"The substring '{sub_string}' is...
The start position is included in the returned substring, but the end position is excluded:Python Copy word[0:2] # Characters from position 0 (included) to 2 (excluded).The output is:Output Copy 'Py' Here's another example that specifies a different range:Python Copy ...
"I love python".rindex('o')11"I love python".index('o')3"I love python".rindex('k')ValueError:substringnotfound"I love python".rfind('k' 五、字符串格式化 17、format() 描述:Python2.6 开始,新增了一种格式化字符串的函数 str.format(),它增强了字符串格式化的功能。基本语法是通过 {} 和 ...
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' >>>...