The index method can’t return a number because the substring isn’t there, so we get a value error instead: 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...
int index = str.indexOf("."); String beforeNum = str.substring(0, index + 1); // 获取小数点后面是否有num位,不足用0补位 String afterNum = str.replace(beforeNum, ""); // 判断小数点后位数是否大于保留的位数 if (afterNum.length() <= num) { for (int a = afterNum.length(); a...
# 获取目标字符串之后的内容ifposition!=-1:# 确定是否找到了目标字符串substring_after_target=input_string[position+len(target_string):]print(f"目标字符串 '{target_string}' 之后的内容:{substring_after_target}")else:print("未找到目标字符串!") 1. 2. 3. 4. 5. 6. 步骤5: 以指定结束字符作为...
str.rfind(substring)返回最高索引。如果找到,str.index(substring)和str.rindex(substring)也分别返回子字符串的最低和最高索引。如果字符串中不存在子字符串,则会引发 ValueError string ="programming" # find and rfind examples print(string.find('m')) print(string.find('pro')) print(string.rfind('m'...
itself, and the part after it. If the separator is not found, returns a 3-tuple containing the original string and two empty strings. """ pass def replace(self, *args, **kwargs): # real signature unknown """ Return a copy with all occurrences of substring old replaced by new. ...
Get Your Code:Click here to download the free sample codethat you’ll use to check if a string contains a substring. Take the Quiz:Test your knowledge with our interactive “How to Check if a Python String Contains a Substring” quiz. You’ll receive a score upon completion to help you...
| Return S centered in a string of length width. Padding is | done using the specified fill character (default is a space) | | count(...) | S.count(sub[, start[, end]]) -> int | | Return the number of non-overlapping occurrences of substring sub in ...
将String 变量转换为 float、int 或 boolean 向字符串填充或添加零的不同方法 去掉字符串中的 space 字符 生成N个字符的随机字符串 以不同的方式反转字符串 将Camel Case 转换为 Snake Case 并更改给定字符串中特定字符的大小写 检查给定的字符串是否是 Python 中的回文字符串 ...
Like find(), but raise ValueError when the substring is not found. str.isalnum()判断字符产是英文或数字组成的 Return true if all characters in the string are alphanumeric and there is at least one character, false otherwise. For 8-bit strings, this method is locale-dependent. ...
single character out of my string. But sometimes, I might want to get a substring. So I want to start at the first character and go halfway into the string, or I want to take a few characters in between, or I want to skip every other letter or something like that in my string. ...