letter='a'string='apple'ifletterinstring:print("Letter found")else:print("Letter not found") 1. 2. 3. 4. 5. 6. 使用find()方法:find()方法返回字符在字符串中的索引位置,如果字符不存在于字符串中,返回-1。 letter='a'string='apple'index=string.find(letter)ifindex!=-1:print("Letter fou...
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...
查index, count, find >>> x = 'abc' >>> x.count('a') 1 >>> x.index('c') 2 >>> x = 'abc' >>> x.find('c') 2 1. 2. 3. 4. 5. 6. 7. 8. 排序sorted >>> x = 'aebdc' >>> sorted(x) ['a', 'b', 'c', 'd', 'e'] # 按单词的长度排序 >>> x = 'I...
Let’s look at a couple of common sequence operations on strings. 让我先定义一个字符串。 Let me first define a string. 让我们来看看“Python” Let’s just go with "Python." 同样,如果我想知道我的字符串有多长,我可以使用len函数。 Again, if I wanted to find out how long is my string,...
string="lucky^ \/696/\ ^money// \Healthy 12**" pattern_num=re.compile("\d+") #匹配至少1个数字 num=pattern_num.findall(string) pattern_letter=re.compile("\w{4,5}") #匹配4-5个字母或数字 letter=pattern_letter.findall(string) ...
Beijing is a beautiful city! (6)引用参数部分 str1 = "The first letter of '{word}' is '{word[0]}'.".format(word="hello") print(str1) 执行以上代码,输出结果为: The first letter of 'hello' is 'h'. (7)数字的处理 ① 保留小数位数 str1 = "π is {:.2f}.".format(3.1415926) ...
# count vowels in a string# declare, assign stringstr="Hello world"# declare countcount=0# iterate and check each characterforiinstr:# check the conditions for vowelsif( i=="A"ori=="a"ori=="E"ori=="e"ori=="I"ori=="i"ori=="O"ori=="o"ori=="U"ori=="u"): ...
Capitalizes first letter of each word in a string using loop, split() method # python program to capitalizes the# first letter of each word in a string# functiondefcapitalize(text):return' '.join(word[0].upper()+word[1:]forwordintext.split())# main codestr1="Hello world!"str2="...
string ="Hello, World!"letter_count = count_letters(string)print("字符串中字母个数为:", letter_count) 该方法使用登录后复制re.findall()函数和正则表达式模式登录后复制[a-zA-Z]来找到字符串中的所有字母,并返回匹配到的列表。通过登录后复制len()函数来获取列表的长度,即字母个数。
如果一个字母(字符串)在列表中,find_letter([‘o’, [‘hello’, ‘c’, ‘bye’]), 返回 True,如果不存在则返回 False。 def find_letter(lst): lst=['o','hello', 1] n='o' if not lst: return 0 elif lst[0] == n: return True elif find_letter(lst[0:]): return True else: ret...