You can access tuple items by referring to the index number, inside square brackets:ExampleGet your own Python Server Print the second item in the tuple: thistuple = ("apple", "banana", "cherry") print(thistuple[1]) Try it Yourself » ...
t = (1, 2, 3) >>> type(t) <class 'tuple'> t[0] 1 t[0] = 5 # 执行不成功,会报TypeError错误 TypeError: 'tuple' object does not support item assignment hash(t) 2528502973977326415 >>> t = (1) # 如果只有一个元素,t则变成了int类型;如果要使t为一个元素 # 的元组,需如下定义 >...
"This module provides access to some objects used or maintained by the\ninterpreter and to functions that interact stronglywiththe interpreter.\n\nDynamic objects:\n\nargv--command line arguments;argv[0]is the script pathnameifknown\npath--module search path;path[0]is the script directory,else...
my_tuple1[0] = 10 # Error: 'tuple' object does not support item assignment Output: The example above defines a tuple my_tuple with elements 1, 2, ‘a’, ‘b’, True, and. We can access individual elements of the tuple using indexing, just like lists. However, if we try to chang...
To access the items in a sublist, simply append an additional index:索引也是根据嵌套来的>>> x[1] ['bb', ['ccc', 'ddd'], 'ee', 'ff'] >>> x[1][0] 'bb' >>> x[1][1] ['ccc', 'ddd'] >>> x[1][2] 'ee' >>> x[1][3] 'ff' >>> x[3] ['hh', 'ii'] >>...
source:src/backend/access/transam/xlog.cBootStrapXLOG(void) /* * This func must be called ONCE on system install. It creates pg_control * and the initial XLOG segment. */voidBootStrapXLOG(void){ CheckPointcheckPoint; char *buffer;
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print('get in init one, self:', id(self), self) # 直接通过索引赋值的方式会报: # PositiveTuple' object does not support item assignment # for i, x in enumerate(self): # self[i] = abs(x) # 只能尝试对self整体赋值 self = tuple(abs(x) for x in self) ...
Objects passed as **data** must support item access (``data[<arg>]``) and membership test (``<arg> in data``). 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23.
为什么Python不支持记录类型？（即可变命名元组）为什么Python不原生支持记录类型呢？这其实是因为我们需要一...