Write a Python program to get a string made of the first 2 and last 2 characters of a given string. If the string length is less than 2, return the empty string instead. Sample Solution: Python Code: # Define a function named string_both_ends that takes one argument, 'str'.defstring...
In addition, we canaccess just a specific characteror aslice of charactersof a string. We might want to do this, for example, if we have a text that’s too long to display and we want to show just a portion of it. Or if we want to make an acronym by taking the first letter of...
class Document:def __init__(self):self.characters = []self.cursor = 0self.filename = ''def insert(self, character):self.characters.insert(self.cursor, character)self.cursor += 1def delete(self):del self.characters[self.cursor]def save(self):with open(self.filename, 'w') as f:f.wr...
get_creators中的简单类型提示清楚地表明它接受一个dict并返回一个list。 示例3-2. creator.py:get_creators()从媒体记录中提取创作者的名称 defget_creators(record:dict) ->list: match record: case {'type':'book','api':2,'authors': [*names]}:# ①returnnames case {'type':'book','api':1,...
test="Python Programming"print("String: ",test)# First one character first_character=test[:1]print("First Character: ",first_character)# Last one character last_character=test[-1:]print("Last Character: ",last_character)# Everything except the first one character except_first=test[1:]print...
# Otherwise, return the string of the result of this move. makeMove() 函数接受四个参数:游戏板的数据结构,宝藏箱的数据结构,x 坐标和 y 坐标。makeMove() 函数将返回一个描述移动响应的字符串值: 如果坐标直接落在宝藏箱上,makeMove() 返回'You have found a sunken treasure chest!'。 如果坐标距离...
sys.getdefaultencoding()# 查看默认编码格式 为 UTF-8 1. 2. 'utf-8' 1. s='油哥' len(s)# 字符串长度,包含字符的个数 1. 2. 2 1. s='油哥 ABCDEFG' len(s)# 中英文同样对待,都是一个字符(空格算一个字符) 1. 2. 10 1.
S.expandtabs([tabsize]) -> string|| Return a copy of S where all tab characters are expan...
If sep is not specified, any whitespace string | is a separator. | | rstrip(...) | S.rstrip([chars]) -> str | Return a copy of the string S with trailing whitespace removed. | If chars is given and not None, remove characters in chars instead. | | split(...) ...
word[:-2]#Allbutthelasttwocharacters Hel 不过-0还是0,所以它不是从右边计数的! word[-0]#(since-0equals0) H 越界的负切片索引会被截断,不过不要尝试在前元素索引(非切片的)中这样做: word[-100:] HelpA word[-10]#error Traceback(mostrecentcalllast): Filestdin,line1,in? IndexError:stringind...