This comprehensive guide explores Python's __deepcopy__ method, the special method that enables custom deep copying behavior for objects. We'll cover basic usage, implementation patterns, and practical examples.
frozenset)# 定义复制解析字典,通过对象类型获取对应的复制方法copy_dispatch=d={}fortinimmutable_object_tuple:d[t]=copy_immutabled[list]=copy_of_listd[set]=copy_of_setd[dict]=copy_of_dict# 定义统一的复制函数,通过类型自动获取对应的复制方法defcopy_func_version_one(x):cls=type(x)# 获取对象类型...
# Clone a list with the copy function (Python 3.3+) my_duplicate_list = my_list.copy() # preferred method # Clone a list with the copy package import copy my_duplicate_list = copy.copy(my_list) my_deep_duplicate_list = copy.deepcopy(my_list) # Clone a list with multiplication? my...
You can use the built-in List method copy() to copy a list.ExampleGet your own Python Server Make a copy of a list with the copy() method: thislist = ["apple", "banana", "cherry"]mylist = thislist.copy() print(mylist) Try it Yourself » ...
copy_method=copy_dispatch[cls]# 假设解析方法已经包含了所有的类型,实际是没有了,后续再优化returncopy_method(x) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 这个时候初步的复制函数出来了,可以类比为内建copy方法的雏形,在使用时可以满足基本的复制需求,但是如果可变对象嵌套...
new_numbers: {1, 2, 3, 4, 5} In the above example, we have modified the copied setnew_numbersusingadd()method. Here, the copied set is different from the original set because we have added new item5to it. Also Read: Python Set update() Python Set clear()...
f = StringIO(my_tsv_string) cursor.copy_expert("COPY my_table FROM STDIN WITH CSV DELIMITER AS E'\t' ENCODING 'utf-8' QUOTE E'\b' NULL ''", f) COPY方法快得惊人。 METHOD | TIME (secs) | # RECORDS === COPY_FROM | 92.998 | 48339 INSERT | 1011.931 | 48377...
This module does not copy types like module, method, stack trace, stack frame, file, socket, window, or any similar types. It does "copy" functions and classes (shallow and deeply), by returning the original object unchanged; this is compatible with the way these are treated by the ...
-me method 设置运动估计的方法 可用方法有 zero phods log x1 epzs(缺省) full -dct_algo algo 设置dct的算法 可用的有 0 FF_DCT_AUTO 缺省的DCT 1 FF_DCT_FASTINT 2 FF_DCT_INT 3 FF_DCT_MMX 4 FF_DCT_MLIB 5 FF_DCT_ALTIVEC -idct_algo algo 设置idct算法。可用的有 0 FF_IDCT_AUTO 缺...
await fetch('//127.0.0.1:3923/', {method:"PUT", body: JSON.stringify(foo)}); var xhr = new XMLHttpRequest(); xhr.open('POST', '//127.0.0.1:3923/msgs?raw'); xhr.send('foo');curl/wget: upload some files (post=file, chunk=stdin) post(){ curl -F f=@"$1" http://127.0....