大约有 600 项符合查询结果（耗时：0.0198秒） [XML]
Most lightweight way to create a random string and a random hexadecimal number
... os,binascii
>>> print binascii.b2a_hex(os.urandom(15))
"c84766ca4a3ce52c3602bbf02ad1f7"
The advantage is that this gets randomness directly from the OS, which might be more secure and/or faster than the random(), and you don't have to seed it.
...
Android: AutoCompleteTextView show suggestions when no text entered
...sh adding the entries:
adapter.add("a1");
adapter.add("a2");
adapter.add("a3");
adapter.getFilter().filter(null);
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How to get HTTP Response Code using Selenium WebDriver
...[Socket Thread]: I/nsHttp Set-Cookie: AWSELB=5F256FFA816C8E72E13AE0B12A17A3D540582F804C87C5FEE323AF3C9B638FD6260FF473FF64E44926DD26221AAD2E9727FD739483E7E4C31784C7A495796B416146EE83;PATH=/
2017-11-02 14:54:36.775000 UTC - [Socket Thread]: I/nsHttp Content-Length: 31081
2017-11-02 14:54:3...
How to round a number to significant figures in Python
...>> to_precision(599, 2)
'600'
>>> to_precision(1164, 2)
'1.2e3'
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Officially, what is typename for?
...expression so a new keyword is introduced called typename
typename T::A* a6;
it instructs the compiler to treat the subsequent statement as a declaration.
Since the keyword was on the payroll,
heck, why not fix the confusion caused
by the original decision to reuse the
class keyword. ...
What is the maximum length of a URL in different browsers?
...browser gets truncated to 32791 characters, concludinding with ... (%E2%80%A6%E2%80%A6)
– Rob Dawson
Sep 27 '16 at 11:19
26
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How to split a string and assign it to variables
... this back from err, unfortunately: too many colons in address 2001:0db8:85a3:0000:0000:8a2e:0370:7334 :(
– J.M. Janzen
Feb 25 '17 at 16:11
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Unicode equivalents for \w and \b in Java regular expressions?
...A])[[\p{Mn}\p{Me}\u200C\u200D\u0488\u0489\u20DD\u20DE\u20DF\u20E0\u20E2\u20E3\u20E4\uA670\uA671\uA672\uFF9E\uFF9F][\p{Mc}\u0E30\u0E32\u0E33\u0E45\u0EB0\u0EB2\u0EB3]]*)|(?s:.))
which in Java you’d write as:
String extended_grapheme_cluster = "(?:(?:\\u000D\\u000A)|(?:[\\u0E40\\u0E41\\u0E42\\u0E4...
Show and hide a View with a slide up/down animation
...inearLayout
android:id="@+id/my_view"
android:background="#a6e1aa"
android:orientation="vertical"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="200dp">
</LinearLayout>
</RelativeLay...
filter for complete cases in data.frame using dplyr (case-wise deletion)
...ed(123)
x <- sample(1e5,1e5*26, replace = TRUE)
x[sample(seq_along(x), 1e3)] <- NA
df <- as.data.frame(matrix(x, ncol = 26))
library(microbenchmark)
microbenchmark(
na.omit = {df %>% na.omit},
filter.anonymous = {df %>% (function(x) filter(x, complete.cases(x)))},
rowSums = {df ...