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Approximate cost to access various caches and main memory?
Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?
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手机串口调试助手：USB OTG 收发文本与十六进制、定时发送（附 .aia 源码）...
...TG 的安卓手机、OTG 转接头、USB 转 TTL 串口模块（CH340 / CP2102 / FT232 / PL2303 均可），或者直接接 Arduino 开发板的 USB 口。
打开串口：选波特率（与设备一致，Arduino 常用 9600 或 115200），点「打开串口」。第一次会弹出 USB 授权框...
Drop all duplicate rows across multiple columns in Python Pandas
...t pandas as pd
df = pd.DataFrame({"A":["foo", "foo", "foo", "bar"], "B":[0,1,1,1], "C":["A","A","B","A"]})
df.drop_duplicates(subset=['A', 'C'], keep=False)
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Extracting the last n characters from a ruby string
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101
Here you have a one liner, you can put a number greater than the size of the string:
"123".sp...
Add column with constant value to pandas dataframe [duplicate]
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21
The reason this puts NaN into a column is because df.index and the Index of your right-hand-side...
扫码寻宝 · App Inventor 2 中文网
...下一条线索，退出重进还能接着玩。主要用到条码扫描器1、微数据库和两个并排的列表。
★★ 难度
动手完成
项目教程跟着步骤完成...
rreplace - How to replace the last occurrence of an expression in a string?
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197
>>> def rreplace(s, old, new, occurrence):
... li = s.rsplit(old, occurrence)
... r...
List of all index & index columns in SQL Server DB
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edited Sep 24 at 2:11
jswolf19
2,2771414 silver badges1515 bronze badges
answered Apr 19 '09 at 1...