Traceback (most recent call last): File"<stdin>", line 1,in<module>ValueError:4isnotinlist 注意:若在列表中找不到这个元素,则会报错。 5.8 list.count(元素) 功能:查看元素在列表中出现的次数 >>> list1 = [1, 2, 3, 1]>>> list1.count(1)2 5.9 len(list) 功能: 获取元素列表个数(长度...
Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: 4 is not in list 注意:若在列表中找不到这个元素,则会报错。 5.8 list.count(元素) 功能:查看元素在列表中出现的次数 >>> list1 = [1, 2, 3, 1] >>> list1.count(1) 2 5.9 len(list) 功能: 获取...
File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment >>> 1. 2. 3. 4. 5. 6. 1、count()查找某个元素出现的次数 x=(1,2,2) print(x.count(2)) >> 2 1. 2. 3. 2、index:找出某个元素的索引位置: x=(1,2,2) 1. print(x.index(2)...
(1, 2, ['python', 'b'])tuple的删除 既然tuple是不可修改的,那么tuple中的元素也是不可删除的,但是我们可以通过del关键字将tuple直接删除掉: >>> t = (1, 2, 3) >>> t (1, 2, 3) >>> del t >>> t Traceback (most recent call last): File "<stdin>", line 1, in <module> Name...
List of Built-in Python Modules entries per page Search: ModuleDescriptionCategory __future__ Future statement definitions Built-in & Special __main__ Top-level code environment and command-line interfaces Built-in & Special _thread Low-level threading API Built-in & Special _tkinter Low-level...
13 #python3X中,不能将数字和字符一起排序,会出现此报错 14 >>> a=[2,4,6,7,3,1,5,'a'] 15 >>> a.sort() 16 Traceback (most recent call last): 17 File "<pyshell#104>", line 1, in <module> 18 a.sort() 19 TypeError: unorderable types: str() < int() ...
pythonclass属性不可调用 python list对象不可调用 list 1.list可以放进tuple (易知) 2.list可以放入dict作为value,但不可以作为key >>> key = [1, 2, 3] >>> d[key] = 'a list' Traceback (most recent call last): File "<stdin>", line 1, in <module>...
File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment >>> 虽然tuple的元素不可改变，但它可以包含可变的对象，比如list列表。构造包含 0 个或 1 个元素的元组比较特殊，所以有一些额外的语法规则：tup1 = () # 空元组 tup2 = (20,) # 一个元素，需...
Python 删除列表实例演示: intlist = [1, 45, 8, 34] print(intlist) del intlist print(intlist) 运行结果: [1, 45, 8, 34] Traceback (most recent call last): File "C:\Users\mozhiyan\Desktop\demo.py", line 4, in <module> print(intlist) NameError: name 'intlist' is not define...
Each link in the chain contains a filter type (AND or OR), and the filters themselves (same as the filter methods on the QueryableList).Use the addFilter(filterType, ..filters..) method to add a link to the chain.To execute the query, call execute(lst) , where "lst" is your ...