string = "This contains a word" if "word" in string: print("Found") else: print("Not Found")输出：Found 我们使用上面程序中的if/in语句检查了字符串变量string中是否包含单词word。这种方法按字符比较两个字符串；这意味着它不会比较整个单词，并且可能会给我们
if ‘xxx’ in strings strings[index] = ‘[censored]’ index +=1 方法有些笨,不过可以接受。另一种方法是使用内建的enumerate函数: for index,string in enumerate(strings): if 'xxx' in string: strings[index] = 'censored' 这个函数可以提供索引的地方迭代索引-值对 3.翻转和排序迭代 让我们看看另外...
() # 使用字典统计单词出现的次数 word_count = {} for word in words: if word in word_count: word_count[word] += 1 else: word_count[word] = 1 return word_count text = """ Got this panda plush toy for my daughter's birthday, who loves it and takes it everywhere. It's soft ...
if 'xxx' in string: strings[index]='[censored]' index += 1 >>> strings ['[censored]', 'I like losing my face', 'Say goodbye'] >>> ['I am xxx', 'I like losing my face', 'Say goodbye', 'xxx is a sensitive word'] ['I am xxx', 'I like losing my face', 'Say go...
string = "Hello, world!" if string.find("world") != -1: (tab)print("String contains 'world'")结合start和end参数使用find函数进行字符串片段的提取。示例：提取字符串中的某个子字符串。string = "Hello, world! world is beautiful." start = 7 end = 12 extract = string[start:end] print...
1 class str(basestring): 2 """ 3 str(object='') -> string 4 5 Return a nice string representation of the object. 6 If the argument is a string, the return value is the same object. 7 """ 8 def capitalize(self): 9 """ 首字母变大写 """ 10 """ 11 S.capitalize() -> ...
在Python 中,要在字符串中查找某个单词,可以使用字符串的find()方法或in操作符。以下是两种常见的方法: 方法一:使用find()方法 string ="This is a sample string."word ="sample"ifstring.find(word)!= -1:print(f"找到单词 '{word}' 在字符串中。")else:print(f"未找到单词 '{word}' 在字符串中...
实例(Python 3.0+) if True: print ("True") else: print ("False")以下代码最后一行语句缩进数的空格数不一致,会导致运行错误:实例 if True: print ("Answer") print ("True") else: print ("Answer") print ("False") # 缩进不一致,会导致运行错误以上程序由于缩进不一致,执行后会出现类似以下错误:...
m = p.match('string goes here')ifm:print('Match found: ', m.group())else:print('No match') match方法和search方法返回Match对象;findall返回匹配字符串的列表,即所有匹配项: >>>importre>>>p = re.compile(r'\d+')>>>p.findall('11 people eat 24 apples ,every people eat 2 apples.'...
if语句 >>> name = input('What is your name?') Whatisyour name?Gumby>>>ifname.endswith('Gumby'):print(name) Gumby 如果条件(if和冒号之间的表达式)是前面定义的真,就执行后续代码块,如果条件为假,就不执行。 else子句,elif子句,嵌套代码块 ...