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Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT
...ppfiles/var/mysql
– Fenix Aoras
Oct 25 '17 at 13:33
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What is the “right” way to iterate through an array in Ruby?
...brittohalloran
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answered Nov 22 '08 at 0:40
Robert GambleRobert Gamble
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Check if object is file-like in Python
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answered Nov 2 '09 at 13:25
drxzcldrxzcl
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Java 8 NullPointerException in Collectors.toMap
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gontardgontard
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How to find the size of localStorage
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– Mario Sannum
Sep 19 '17 at 14:25
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There's a bug in the bookmarklet. You're using underscor...
How to draw a rounded Rectangle on HTML Canvas?
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edited Jan 8 '18 at 1:25
Coder-256
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answered A...
Ant: How to execute a command for each file in directory?
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answered Sep 25 '09 at 15:56
Jeffrey FredrickJeffrey Fredrick
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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最高Version 40，(40-1)*4+21 = 177，所以最高是177 x 177 的正方形。
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data.table vs dplyr: can one do something well the other can't or does poorly?
...;% group_by(z) %>% do(data.frame(.$x[1:2], .$y[1]))
DT[, quantile(x, 0.25), by = z]
DF %>% group_by(z) %>% summarise(quantile(x, 0.25))
DT[, quantile(x, c(0.25, 0.75)), by = z]
DF %>% group_by(z) %>% do(data.frame(quantile(.$x, c(0.25, 0.75))))
DT[, as.list(summary(x)), by = z]
DF %...
Using global variables in a function
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I disagree that the reason Python requires the global keyword is because globals are dangerous. Rather, it's because the language doesn't ...