大约有 740 项符合查询结果（耗时：0.0148秒） [XML]
Is there documentation for the Rails column types?
... 'tinytext'
when nil, 0x100..0xffff; 'text'
when 0x10000..0xffffff; 'mediumtext'
when 0x1000000..0xffffffff; 'longtext'
else raise(ActiveRecordError, "No text type has byte length #{limit}")
end
end
# and binary ...
def binary_to_sql(limit) # :nodoc:
...
How can I store my users' passwords safely?
...g on how easily guessable). The default for the SHA-256 crypt algorithm is 10000 round, so that would make it 10000 times more difficult.
– Inshallah
Oct 17 '09 at 9:48
3
...
How and when to use ‘async’ and ‘await’
... async Task<string> WaitAsynchronouslyAsync()
{
await Task.Delay(10000);
return "Finished";
}
// The following method runs synchronously, despite the use of async.
// You cannot move or resize the Form1 window while Thread.Sleep
// is running because the UI thread is blocked.
public a...
Rename specific column(s) in pandas
...]
Timings:
%%timeit
df.rename(columns={'gdp':'log(gdp)'}, inplace=True)
10000 loops, best of 3: 168 µs per loop
%%timeit
df.columns = ['log(gdp)' if x=='gdp' else x for x in df.columns]
10000 loops, best of 3: 58.5 µs per loop
...
How do you know when to use fold-left and when to use fold-right?
...r large lists, while a foldLeft won't.
Example:
scala> List.range(1, 10000).foldLeft(0)(_ + _)
res1: Int = 49995000
scala> List.range(1, 10000).foldRight(0)(_ + _)
java.lang.StackOverflowError
at scala.List.foldRight(List.scala:1081)
at scala.List.foldRight(List.scala:1081)...
How to check whether a pandas DataFrame is empty?
...
import pandas as pd
import numpy as np
df = pd.DataFrame(np.random.randn(10000, 4), columns=list('ABCD'))
def empty(df):
return df.empty
def lenz(df):
return len(df) == 0
def lenzi(df):
return len(df.index) == 0
'''
%timeit empty(df)
%timeit lenz(df)
%timeit lenzi(df)
10000 loops,...
Python - Create a list with initial capacity
...
def doAppend( size=10000 ):
result = []
for i in range(size):
message= "some unique object %d" % ( i, )
result.append(message)
return result
def doAllocate( size=10000 ):
result=size*[None]
for i in range(si...
How to skip “Loose Object” popup when running 'git gui'
... Can we increase after 1000 hint_gc so the warning happens after 10000 loose objects?
– sashoalm
Feb 17 '17 at 9:19
...
Why does changing 0.1f to 0 slow down performance by 10x?
... y[i]=y[i]+0;
y[i]=y[i]-0;
#endif
if (j > 10000)
cout << y[i] << " ";
}
if (j > 10000)
cout << endl;
}
double end = omp_get_wtime();
cout << end - start << endl;
system("p...
Algorithm for classifying words for hangman difficulty levels as “Easy”,“Medium”, or “Hard”
...re the words with:
score < 2000 # Easy
2000 < score < 10000 # Medium
10000 < score # Hard
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