The first occurrence of 'o' is at index 4 1. 如果字符不存在于字符串中,index()方法将引发ValueError异常。为了避免异常的发生,可以使用in关键字进行判断。 string="Hello, World!"char="z"ifcharinstring:index=string.index(char)print(f"The first occurrence of '{char}' is at index{index}")else:...
将用户输入的原始字符串和目标子字符串分别赋值给original_string和target_string变量。 2. 使用str.find()查找子字符串的首次出现位置 接下来,我们使用str.find()函数来查找目标子字符串在原始字符串中的首次出现位置。 # 使用str.find()查找子字符串的首次出现位置first_occurrence=original_string.find(target_stri...
Split the string at the first occurrence of sep, and return a 3-tuple containing the part before the separator, the separator itself, and the part after the separator. If the separator is not found, return a 3-tuple containing the string itself, followed by two empty strings. >>>a ='a...
Split the string at the first occurrence of sep, and return a 3-tuple containing the part before the separator, the separator itself, and the part after the separator. If the separator is not found, return a 3-tuple containing the string itself, followed by two empty strings. New in vers...
The example replaces the first occurrence of the word 'fox'. $ ./replace_first.py There is a wolf in the forest. The fox has red fur. Python replace last occurrence of stringIn the next example, we replace the last occurrence of word 'fox'. ...
Alternatively, you can use theindex()method to find the index of the first occurrence of the string in the list. For example: my_list=["apple","banana","cherry"]try:index=my_list.index("banana")print(f"Found at index{index}")exceptValueError:print("Not found") ...
sub- It is the substring to be searched in thestrstring. startandend(optional) - The rangestr[start:end]within which substring is searched. find() Return Value Thefind()method returns an integer value: If the substring exists inside the string, it returns the index of the first occurence ...
from stringimportascii_letters,digits defcompare_alphanumeric(first,second):forcharacterinfirst:ifcharacterinascii_letters+digits and character notinsecond:returnFalsereturnTrue str1='ABCD'str2='ACDB'print(compare_alphanumeric(str1,str2))str1='A45BCD'str2='ACD59894B'print(compare_alphanumeric(str...
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}"...
Return a copy of the string with only its first character capitalized. For 8-bit strings, this method is locale-dependent. str.center(width[, fillchar]) Return centered in a string of length width. Padding is done using the specified fillchar (default is a space). ...