编写一个程序,给出一个列表,判断该列表是否为空。如果该列表为空,输出 “The list is empty”;如果不为空,输出 “The list is not empty”。 输入描述 无输入。 输出描述 根据该列表是否为空,如果该列表为空,输出 “The list is empty”;如果不为空,输出 “The list is not empty”. ...
self.next=None #初始下一节点为空 class SingleLinkList: #单链表 def __init__(self,node=None):#初始化链表 self._head=node def is_empty(self):#判断链表是否为空 return self._head==None def length(self): cur=self._head count=0 while cur!=None: count+=1 cur=cur.next return count d...
判断列表是否为空的方法与判断字符串是否为空的方法类似,下面给出一个示例代码。 defis_empty_list(lst):iflen(lst)==0:returnTrueelse:returnFalselst=[]ifis_empty_list(lst):print("列表为空")else:print("列表不为空") 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 判断字典是否为空 判断字典...
Hello, codedamn learners! Today, we are going to delve deep into a ubiquitous yet crucial aspect of Python programming: checking if a list is empty. This task may seem trivial, but understanding it thoroughly can make a significant difference in your
slave_dir_list.append(elem.text) usb_dirs.sort(reverse=True) return master_dir, slave_dir_list, usb_dirs @ops_conn_operation def file_exist_on_master(file_path='', ops_conn=None): home_dir, _, _ = get_home_path() if home_dir is None: logging.error("Failed to get the home di...
defcalculate_average(grades):ifnot grades:print("The list of grades is empty.")returnNonetry:total=sum(grades)average=total/len(grades)returnaverage except IndexErrorase:print(f"Error: {e}")returnNone grades=[85,90,78]average=calculate_average(grades)ifaverage is not None:print(f"The averag...
async def wait(fs, *, loop=None, timeout=None, return_when=ALL_COMPLETED): if futures.isfuture(fs) or coroutines.iscoroutine(fs): raise TypeError(f"expect a list of futures, not {type(fs).__name__}") if not fs: raise ValueError('Set of coroutines/Futures is empty.') if return...
if not my_list: print("List is empty") This is using the Truth Value Testing in Python, also known as implicit booleaness or truthy/falsy value testing.Among other rules it defines that empty sequences and collections like '', (), [], {}, set(), range(0) are all considered false...
y=Noneprint('not x:%s'%(notx))print('not y:%s'%(noty))print('')print('x is None:%s'%(xisNone))print('y is None:%s'%(yisNone)) module_list=[] iflen(mylist):#Do something with my listelse:#The list is empty 由于一个空 list 本身等同于False,所以可以直接: ...
四、list类解析 >>> help(list) Help on class list in module builtins: class list(object) |list() -> new empty list |list(iterable) -> new list initialized from iterable's items (可迭代对象,__iter__) | | Methods defined here: ...