We’re not changing the underlying string that was assigned to it before. We’re assigning a whole new string with different content. In this case, it was pretty easy to find the index to change as there are few characters in the string.How are we supposed to know which character to ch...
: print( "Second Last character in string : " , sampleStr[-2] ) ...: print( "First character in string : " , sampleStr[ -len(sampleStr) ] ) Last character in string : g Second Last character in string : n First character in string : H 修改字符? 由于字符串是不可变的,当我们...
last_occurrence = s.rfind(char) if last_occurrence == -1: print(f"Character '{char}' not found in the string.") else: print(f"Last occurrence of '{char}' is at index:", last_occurrence) # 输出: # Last occurrence of 'o' is at index: 27 # Last occurrence of 'l' is at ind...
Out[53]: ' string' In [54]: "{0:&>20}".format("string") Out[54]: '&&&&&&string' In [55]: "{0:#>20}".format("string") #使用#号会有个小bug ...: Out[55]: '###string' In [60]: '{0:+<20}'.format("string") #向右对齐填充+ Out[60]: 'string+++++++++' In [...
print(second_last_character) # 输出 “l” “` 3. 切片操作: “`python string = “Hello World” substring = string[-5:-1] print(substring) # 输出 “Worl” “` 4. 遍历字符串的每一个字符: “`python string = “Hello” for char in string: ...
str = 'Antarctica is really cold.' a = len(str) print('length of str ', a) #last character with the help of length of the string print('str[a] ', str[a-1]) #last character with the help of indexing print('str[-1] ',str[-1]) 输出: str 26str [a]的长度。str [-1]。
string containing all characters considered printable 19 20 """ 21 22 # Some strings for ctype-style character classification 23 whitespace = ' \t\n\r\v\f' 24 lowercase = 'abcdefghijklmnopqrstuvwxyz' 25 uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 26 letters = lowercase + uppercase 27 ascii_...
string-常用string操作 1. 字符串常量 string.ascii_letters string.ascii_lowercase string.ascii_uppercase string.digits string.hexdigits string.octdigits string.punctuation string.printable string.whitespace 2. 自定义字符串格式 2.1 class string.Formatter ...
word[-1]# Last character. 输出为: Output 'n' 同样地,其他负索引会从相应的位置返回字符: Python word[-2]# Second-to-last character. 输出为: Output 'o' 切片 Python 既支持索引,也支持切片,前者从字符串中提取单个字符,后者提取子字符串(或切片)。 若要进行切片,需采用“开始:结束”格式指示范围。
如果字符存在,该代码会输出:The last occurrence of 'o' is at index 8. 如果字符不存在,该代码会输出:The character 'o' does not exist in the string. 方法三:使用列表推导式 除了使用字符串对象提供的方法外,我们还可以使用列表推导式来查找字符最后出现的位置。