我使用成功炮击了Docker容器
docker exec -i -t 69f1711a205e bash
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现在我需要编辑文件,里面没有任何编辑器:
root@69f1711a205e:/# nano
bash: nano: command not found
root@69f1711a205e:/# pico
bash: pico: command not found
root@69f1711a205e:/# vi
bash: vi: command not found
root@69f1711a205e:/# vim
bash: vim: command not found
root@69f1711a205e:/# emacs
bash: emacs: command not found
root@69f1711a205e:/#
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如何编辑文件?
有时我从下载python源代码,github
不知道如何安装所有依赖项.如果没有requirements.txt
文件,我必须手工创建.问题是:鉴于python源代码目录是否可以requirements.txt
从导入部分自动创建?
问题是如何在pandas数据帧中为类别列填充最常用级别的NaN?
在R randomForest包中有
na.roughfix选项:A completed data matrix or data frame. For numeric variables, NAs are replaced with column medians. For factor variables, NAs are replaced with the most frequent levels (breaking ties at random). If object contains no NAs, it is returned unaltered.
在Pandas中我可以用以下数字填充NaN值:
df = df.fillna(df.median())
Run Code Online (Sandbox Code Playgroud) 我有复制插槽,我想删除,但当我删除时,我收到一个错误,我无法从视图中删除.有任何想法吗?
postgres=# SELECT * FROM pg_replication_slots ;
slot_name | plugin | slot_type | datoid | database | active | xmin | catalog_xmin | restart_lsn
--------------+--------------+-----------+--------+----------+--------+------+--------------+-------------
bottledwater | bottledwater | logical | 12141 | postgres | t | | 374036 | E/FE8D9010
(1 row)
postgres=# delete from pg_replication_slots;
ERROR: cannot delete from view "pg_replication_slots"
DETAIL: Views that do not select from a single table or view are not automatically updatable.
HINT: To enable deleting from the view, provide an INSTEAD OF …
Run Code Online (Sandbox Code Playgroud) 在研究算法和数据结构时,我手动评估了脚本的 BigO 复杂性。有没有办法,比如任何 Python IDE 或包中的一个按钮,来计算任何给定函数或程序的 BigO?
更新:
假设我有
def print_first_element(a):
print a[0]
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为什么我不能编写分析器,它会说我可以通过索引及其 O(1) 访问数组(列表),或者
def print_all_element_of_list(a):
for i in a:
print i
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好的,你有完整的扫描,所以复杂度是 O(n)
等等
如何检测我的自定义键盘使用的应用程序并显示不同的按钮?例如在Twitter中我会将@添加到字符串我发布到输入字段和Reddit/r /
我有素数组,例如0到1000之间的整数
primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, …
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