The any() function checks if any element in an iterable meets a specified condition. It returns True as soon as it finds an element that satisfies the condition; otherwise, it is False. Example data_string="The last season of Game of Thrones was not good"main_list=['Stranger Things','...
查看4是否在列表中(使用循环):存在查看4是否在列表中(使用in关键字):存在 实例2 # 初始化列表 test_list_set=[1,6,3,5,3,4] test_list_bisect=[1,6,3,5,3,4] print("查看 4 是否在列表中 ( 使用 set() + in) : ") test_list_set=set(test_list_set) if4intest_list_set : print("...
‘a' open for writing, appending to the end of the file if it exists ‘b' binary mode ‘t' text mode (default) ‘+' open a disk file for updating (reading and writing) ‘U' universal newline mode (for backwards compatibility; should not be used in new code) 打开文件的模式有:1...
filename)):file_extension = filename.split('.')[-1]destination_directory = os.path.join(directory_path, file_extension)if not os.path.exists(destination_
print(string) In the above code, we are using the re.sub() method to remove the substring of the string if it exists. So we gave an empty string in the replace string parameter “re.sub(‘, and the capital of New York is Albany’, ”, string)” so it will remove the pattern yo...
Check if an element exists in a list in Python by leveraging various efficient methods, each suited to different scenarios and requirements. This article will guide you through the multitude of ways to determine the presence of an element within a list, ranging from the straightforward in operator...
def double_evens(numbers): return [num * 2 if num % 2 == 0 else num for num in numbers] numbers = [int(input(f"请输入第{i+1}个数: ")) for i in range(5)] doubled_evens = double_evens(numbers) print(f"翻倍后的列表是: {doubled_evens}") 1.2 数据结构 列表(list)操作 题目...
choice(list(PLUGINS.items())) ... print(f"Using {greeter!r}") ... return greeter_func(name) ... >>> randomly_greet("Alice") Using 'say_hello' 'Hello Alice' The randomly_greet() function randomly chooses one of the registered functions to use. In the f-string, you use the ...
(my_list,index_to_check):return0<=index_to_check<len(my_list)fruit_list=["Apple","Banana","Pineapple"]index_to_check=2ifindex_exists(fruit_list,index_to_check):print(f"Index {index_to_check} exists in the list.")else:print(f"Index {index_to_check} does not exist in the list....
f.write(string) 把string字符串写入文件。 f.writelines(list) 把list中的字符串一行一行地写入文件,是连续写入文件,没有换行。 读写文件 代码语言:javascript 复制 #/usr/bin/python # # ithomer in 2013 filename = "test_file.txt" def write_file(): f = open(filename, 'w') f.write('hello ...